Timstar International Catalogue 2018-19

LogIT DATA LOGGING LogIT Microsense Sensors continued Light Level Sensor with Lens Infra Red Sensor A wide bandwidth light level sensor which features a built in 20° lens/reflector optical system and includes a set of coloured filters, two of which can be used Measures both radiated power in W/m2 and also temperature which enables as a visible block/infrared pass filter. Also ideal for applications requiring a you to point it at objects recording and displaying readings directly. Supplied focused light path. with comprehensive investigation guide which includes Insulation and loss of heat, Physiological non-contact thermometry, Leslie Cube and Solar Radiation experiments. Sensor range: 250-1800 W/m2. LogIT Lab has temperature scale option i.e. use as a non-contact thermometer. DA61204 £25.66 ea DA71115 £110.19 ea Light Gate Set Light Level Sensor A pair of infra red light gates (70mm gap), designed primarily for timing the movement of objects. When used with software, the light gate becomes a very Designed for general purpose measurement of ambient light levels. The sensor powerful teaching tool as Acceleration, Kinetic energy, Speed and Time of uses a sensitive silicon device which responds to a wide spectrum, including objects can be studied. infrared. A built in electronic filter smoothes ‘flicker’ response from fluorescent lamps etc. Light gate, 0 to 200Hz (resolution 1 Hz); Counting, 0 to 200 counts per second; Rate, 0 to 250/min (resolution 1/min) DA61271 £25.92 ea Light Lux Sensor DA61208 £97.23 pr Intended for accurate light intensity measurement in the range 0-25,000 LUX and features an integral natural eye response filter. Linear Accelerometer Solid state accelerometer which measures x-y acceleration - ideal for trolley, vehicle, lift or amusement park investigations! Contained in a small housing allowing easy attachment to trolleys and air tracks. DA61266 £77.65 ea Light SPX Lux Sensor Designed specifically for monitoring and recording levels and changes of outdoor natural light in the wide dynamic range of 0-100,000 LUX (not suitable for indoor lab use). DA61276 £38.76 ea DA61254 £128.34 ea Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 249

DATA LOGGING LogIT LogIT Microsense Sensors continued Adjustable pH Amplifier Magnetic Field Sensor For pH work requiring high accuracy, this amplifier enables individual calibration adjustment of most standard pH electrodes and measures the full Intended for educational investigations into the characteristics and strength of range of 0 to 14pH. Input via standard BNC socket. magnetic and electromagnetic fields. The probe is a miniature Hall effect solid state sensor mounted on a very flexible probe to allow easy access for coils. Range -90mT to +90 mT. Magnetic flux density (B). Nominal accuracy ±9%. DA61268 £81.66 ea DA61277 £77.65 ea Movement & Position Sensor Adjustable pH Amplifier & Electrode Set A rotation sensor with extremely low torque giving output of 0-340° angular Contains the adjustable pH amplifier and pH probe with BNC plug. position. Use for simple harmonic motion (pendulum), auxanometer etc. With clamp and locking screw. DA61263 £64.69 ea DA61278 £124.98 set Oxygen Sensor (Dissolved Oxygen Probe) Pressure Mat Set Designed to measure percentage saturation with automatic temperature Can be triggered by falling objects, human feet (e.g. race timing) for time/ compensation. Features simple single control calibration and needs no battery. speed/reaction investigations. Can be used in a similar way to light gates. Set includes amplifier, DarOe 2apvaroilbaeb,le3amndemcobnrataniens3anmdembobtrtlaenoefs KCl solution. Spare membrane sets and KCl solution. DA61207 £236.25 ea DA61275 £45.38 set SPARES & ACCESSORIES £70.00 pk DA61280 Spare membranes, pack of 3 pH Electrode & Amplifier Set Pulse Monitor Sensor Uses a standard pH electrode which connects to LogIT and measures level and The LogIT Pulse Monitor clips to the ear or finger enabling a person’s pulse trends in full range of 0 to 14 pH. to easily and quickly be measured. The clip detects minute changes of blood pressure in the artery and a small microprocessor calculates pulse rate or displays the waveform. For best results clip needs to be still so not suitable for use during vigorous exercise but fine for exercise bikes, steps. DA61206 £112.78 set DA61274 £90.61 ea 250 …inspiring tomorrow’s scientists through practical science.

LogIT DATA LOGGING LogIT Microsense Sensors continued Sound Wave Sensor Radioactivity Probe The Sound Wave sensor is specially designed to allow audio sound waves to be displayed, compared and analysed using some of the fast LogITs such An easy to use radioactivity sensor which can be used to measure Alpha, Beta as DataVision, Voyager and Blackbox datalogger. Can be used to measure: and Gamma radiation. The probe has two ranges for fast or slow rates (counts Amplitude and frequency of sound, Difference of frequency response, Tuning per second/counts per minute) and can be used for logging radioactive decay fork analysis, Speed of sound. (half life), variation of rate with distance, absorption of radiation etc. DA71125 £63.51 ea DA61252 £281.25 ea HiTemp Temperature Sensor Sound Level Sensor A general purpose temperature sensor for measuring air, surface or liquid temperature. The sensor has Designed to measure and record sound levels in a dynamic range of 50- a built in 1 m long cable and 100dB. Standard A-weighted response filter built-in. is lightweight and waterproof but should not be exposed to corrosive or toxic substances. The sensor has a small stainless steel tip with low thermal mass which responds quickly to small changes in temperature. DA61272 Range £25.92 ea -10 °C-110 °C DA61205 £60.93 ea ProTemp Temperature Sensor A precision engineered high accuracy sensor designed to measure liquid, air or soft soil temperature. The stainless steel probe is 180mm long and its construction makes it more robust than the HiTemp sensor. Stream Flow Sensor A robust impeller sensor which measures water flow in rivers and streams -includes a 1 metre wading rod (2 part) and cable. DA61203 £36.30 ea ProTemp Temperature Sensor & Moulded Extension Lead A precision engineered high accuracy sensor designed to measure liquid, air or soft soil temperature. The stainless steel probe is 180mm long and its construction makes it more robust than the HiTemp sensor. Supplied with a 1 metre sensor extension cable. DA61281 £218.73 ea DA61279 £42.13 ea Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 251

DATA LOGGING LogIT LogIT Microsense Sensors continued LogIT Accessories £10.83 ea Pro Sensor Extension Lead £19.31 ea Ultrasonic Ranger VS AB Ultrasonic position sensor for physics and maths using visible setup LEDs for simple setup. The unit measures distance by timing an ultrasonic sound moving from the sensor to an object and its echo back to the sensor. It can take up to 20 measurements per second making it suitable for simple harmonic motion experiments with springs etc. It also has a set of rotating LEDs which provide a convenient and simple method of setting up the ranger. The unit is powered from the LogIT data logger. Useful for: Simple harmonic motion, distance time graphs and general distance measurements. • Range: 200 to 5000mm • Resolution: 1mm. DA61202 Length DA61305 A 1 metre B 3 metres Moulded Sensor Extension Lead DA61273 £162.04 ea Ultra Violet Sensor DA61306 Length £6.19 ea 1 metre A sensor for detecting UVA and UVB for measuring UV effectiveness of suncreams, transmittance of different sunglasses etc. Serial To USB Adapter Connects serial versions of LogIT dataloggers to the USB port on a computer. DA61285 £123.15 ea Voltage Measurement Set DA61327 £32.39 ea Designed for general voltage measurement in electronic circuits or for USB Leads connecting to other sensors. The set includes a range of probes, plugs and clips. USB Cables • Range -25 to +25 volts DC High speed USB 2.0 shielded cables for connecting computers and hardware. • Accuracy ±1 % over voltage range. Data transfer rate of up to 480 Mbps. Also compatible with USB 1.1 devices. DA61209 £45.38 set EL101392 Type Length £3.78 ea Male A to Male B 2m 252 …inspiring tomorrow’s scientists through practical science.

Economy Data Loggers DATA LOGGING Economy Mini Data Logger A B C These data loggers feature a sensor, battery and memory is a self-contained Code package the size of a USB flash drive. No additional cables or hardware are DA130500 A required to set up the logger or retrieve the data – simply plug into a computer DA130505 A and use the free software. DA150510 B DA150515 C The sample rate can be set between one sample per second, and one sample per hour, meaning a 8,192 sample memory will record between 2 hours and almost a year of data. If required, the data logger can be programmed to start recording at a set time and date, so it can be put in place in advance, and data only recorded when required, for example, overnight. The loggers can be used outside or even in a liquid if protected in a waterproof bag or container. The CR1220 coin cell battery will last between 2-3 years, and is replaceable. Logger Range Resolution Memory Price Temperature -20 °C - 60 °C 0.1 °C 8,192 samples £24.99 Light 5 lux - 70 klux n/a 16,384 samples £24.99 Voltage 20 mV 8,192 samples £34.35 0 - 10 V 6,144 samples Acceleration 62.5 mg £34.35 -8 - +8 'g' per axis Software can be downloaded from: timstar.co/EconomyDataLoggerSoftware uLog Data Loggers uLog No data loggers required. Direct USB sensors uLog Sensors The software can be downloaded for free from: uLog sensors connect directly to the computer, with no need for data logger timstar.co/LogITsoftware or interface. The included SensorLab software allows you to configure the parameters of the experiment, and then view, plot and analyse the data, or it D can be exported to other software such as spreadsheets. E Multiple uLog sensors can be connected to the computer. An RGB LED on each sensor automatically lights up with the same colour as its plot in the software for easy identification. The uLog Light gates use a single USB port, as the slave gate plugs into the master gate. The SensorLab software can be used for timing experiments. The USB Microsense adaptor enables most LogIT Microsense sensors to plug in and work alongside uLog sensors. AB C Type F G £11.61 ea DA114015 A uLog Light Sensor £42.50 ea DA114010 B uLog Temperature Sensor £63.51 ea DA114020 C uLog Sound Sensor £47.44 ea DA114025 D uLog pH Sensor £128.34 ea DA114030 E uLog Ultrasonic Range Sensor £99.94 ea DA114035 F uLog Light Gate Set £142.59 pr DA114200 G uLog LogIT Microsense Adaptor £43.69 ea Sensor Light Temperature Sound pH Ultrasonic Range Range 0-100,000 lux -10 - 100 C 50 - 100 dBA 0 - 14 pH 20 - 500 cm Sensorlab for uLog Single to Site License £76.49 pk USB Extension Cable Upgrade CD Pack Extends the uLog sensor cable Upgrade the single user software supplied to site. Length DA114305 DA114300 3 metres Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 253

Join ASE! Promoting excellence in science teaching and learning ASE is the UK’s largest subject association, creating conferences, online resources, publications, INSET, and a national support network. If you need advice, resources or like-minded people to talk to, ASE is the family to join. Members enjoy: • Professional advice and information on issues of direct concern to all involved with science teaching • Indemnity insurance for individual members • Regular high quality journals: Primary Science or School Science Review and Education in Science • Regional, area and national conferences • Discounts on ASE publications including teaching resources and health and safety guides. For further details on membership and other services contact: The Association for Science Education, College Lane, Hatfield, Hertfordshire AL10 9AA Tel: 01707 283000 Fax: 01707 266532 Email: [email protected] Website: www.ase.org.uk Over recent years many educational websites and portals have come and gone as enthusiasm and funding has dried up or moved on . . . . . . but not this one! www.schoolscience.co.uk - where things never stand still! ADVERTISEMENT

255 EARTH SCIENCE Globes256 Hydrological Models 259 Geological Models 257 Fossils259 Geology Tools 258 Rocks & Minerals 260

EARTH SCIENCE Globes Physical Globes Illuminated Globe ‘Atmosphere Blue’ These globes have striking cartography, in either political or physical form, This double image globe has physical and feature raised relief on the landmasses to give a tactile indication of mapping when unlit and Political the location of the world’s mountain ranges. They also use raised relief to when lit. Excellent cartography, portray the ocean depths, revealing the trenches and mid ocean rises, which all current. Mounted on a smoky are important to the understanding of plate tectonics and oceanography. The plastic base and half meridian. As a ocean mapping also shows the direction of major currents, which is useful for basic globe this cannot be bettered. an understanding of climatology and meteorology. Dimensions (Dia.) 300mm. • 300 mm diameter, Political or physical globes EA81300 • Over 4000 place names and pieces of information • Suitable for advanced geographic study Mini Globe • Graduations on meridian help to work out lines of longitude & latitude • Includes time dial to calculate different time zones Budget globe which has accurate and • Available mounted on sturdy metal base and meridian or durable plastic up to date information, in political • base and meridian. format. Ideal for individual or group work. Dimensions (Dia.): 100mm. Assembled in the UK with recycled and recyclable materials, using • traditional methods Supplied with information booklet £48.85 ea EA18210 Type £43.69 ea EA140105 £8.44 ea EA160115 £50.98 ea £44.31 ea Plastic Base Blank Globe Metal Base This globe has political outlines but no Political Globes country or place names and comes supplied with a pack of dry wipe pens These globes have striking cartography, in either political or physical form, for writing on the globe. Suitable for and feature raised relief on the landmasses to give a tactile indication of a range of teaching and learning the location of the world’s mountain ranges. They also use raised relief to activities. Dimensions (Dia.): 300mm. portray the ocean depths, revealing the trenches and mid ocean rises, which are important to the understanding of plate tectonics and oceanography. The EA140100 ocean mapping also shows the direction of major currents, which is useful for an understanding of climatology and meteorology. Inflatable Globes • 300 mm diameter, Political or physical globes These inflatable globes, in political • Over 4000 place names and pieces of information format, are available in three sizes and • Suitable for advanced geographic study come complete with a hanging loop • Graduations on meridian help to work out lines of longitude & latitude and repair kit. • Includes time dial to calculate different time zones • Available mounted on sturdy metal base and meridian or durable plastic • base and meridian. Assembled in the UK with recycled and recyclable materials, using • traditional methods Supplied with information booklet EA18212 Type £50.25 ea EA140110 Type Diameter £5.10 ea EA160130 £50.98 ea EA18200 £7.44 ea Plastic Base EA18205 Medium 300 mm £18.69 ea Metal Base Large 400 mm Giant 700 mm 256 …inspiring tomorrow’s scientists through practical science.

Geological Models EARTH SCIENCE Geological Fault & Fold Model Volcanoes & Earthquakes Kit A durable model to demonstrate simple geological faults and folding of rock Earth is constantly changing - massive pieces of its outer layer are slowly strata. sliding under, over, away from, or past each other. Earthquakes shake the continents and oceans, and volcanoes spew out the molten insides of our Made from environmentally friendly EVA foam, the flexible multi-colour layers planet. By studying these awe-inspiring and devastating natural phenomena, help make deformation and displacement of rock strata easier to understand. you can learn more about the inner workings of Earth. A full-colour, 48-page Transparent film is attached to the fault surface and can easily be removed or experiment manual is included. attached. Model includes 3 blocks to demonstrate faulting and one 100 mm block to show folding. Compact enough to be suitable for individual student or • Build and erupt a model volcano with plaster-based “lava” that hardens group use. • after each eruption. Volcano can be erupted multiple times - volcanic cone builds up with each eruption, like a real volcano. • Learn about the different types of volcanoes. • Build a working seismograph and simulate earthquakes to see how • scientists measure earthquake forces. Discover plate tectonics, and see how volcanoes and earthquakes are • caused by the constant movement of the planet’s parts. Assemble a plate tectonics puzzle and a geological globe. Play a volcano quiz game to learn about well-known volcanoes. EA170200 £3.74 ea Seismograph Model This simple apparatus allows students to simulate earthquake measurement. Pull the paper as the table is rocked and the pen will record the intensity of the movement. Full teachers notes are provided to ensure students understand the “Richter Scale” and the power of earthquakes. Spare paper rolls are available separately. EA140125 £28.69 kit Volcano Model Safely demonstrate the principles of volcanos with this realistic model that erupts internally. Eruption and continuous foaming action can be controlled by hand pressure using the unique bottle and tube delivery system. Totally safe with no heat or flames. Provided with comprehensive, fully-illustrated teacher and student literature, as well as step-by-step set up and operating instructions. Dimensions (Diameter x H): 300 x 100mm. EA81315 £46.85 ea £8.03 ea SPARES & ACCESSORIES EA81318 Seismograph paper roll RICHTER SCALE INFO EA81320 £53.85 ea £111.25 set The Richter scale, devised by TECHNICAL Stream Table Charles Richter in 1935, is a quantitative measure of the This equipment set will help study magnitude of an earthquake. stream erosion and development, erosion cycles and landform It is a Base 10 Logarithmic scale development. Contains a 1,270 x i.e. each whole number increase 356 x 76mm heavy duty tray with corresponds to a 10 times increase in drain; a 930 x 50mm radius amplitude. For example, an earthquake trough, a support to change the of magnitude 5 on the Richter scale tray elevation and siphon tube with will be 10 times more powerful than a clamp. Includes a teacher’s guide. magnitude 4. Sand not supplied. An increase in magnitude of 1 unit also EA81330 equates to an approximately 32 times increase in energy released overall during an earthquake. The Amplitude of the Seismic (shock) waves gives a measure of ground movement during an earthquake i.e. the speed or acceleration of sudden ground movements (shaking) – detected by Seismometers, recorded by Seismographs and represented graphically as Seismograms. The Richter Scale has no specified upper limit but is generally quoted on a scale of magnitudes between 0 and 9 (and decimal fractions in between) – due to the fact that no earthquakes have yet been recorded above magnitude 9. Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 257

EARTH SCIENCE Geology Tools Cold Steel Chisels Hand Lens, Illuminated These cold steel chisels are an economical option for splitting rocks etc. Good quality hand lens with built-in LED illumination, on-off switch and 10 x 18mm lens. Complete with case. Supplied with 3 x LR43 button cells (BA01989). B BEST SELLER EA110630 £6.28 ea A EA110610 Length Diameter £3.69 ea Hand Lens, Rubberised EA110615 ✓ £3.69 ea A 102 mm 6.4 mm (1/4”) A compact hand lens with rubberised lens housing and 10 x 18mm lens. B 152 mm 12.7 mm (1/2”) Complete with case. Geological Hammers Professional quality, incorporating a honed chisel end and a fully polished and hardened square striking face. Fitted with a seasoned hickory handle. A BEST EA110635 ✓ £3.10 ea SELLER Hand Lens, LED UV Illumination B Triplet optics with UV light for fluorescence in minerals. EN071966 Weight ✓ £26.36 ea EA110625 £32.95 ea A 1 lb (450 g) B 2 lb (900 g) UVC (Shortwave) Ultra Violet Lamp EA140120 £32.01 ea SPARES & ACCESSORIES £2.63 ea A small, handy ultraviolet lamp with fold out foot stand, ideal for observing BA01988 SR44 Battery minerals under a whole new light! Due to the properties of certain minerals, placing samples under UV light in a darkened room can help to identify them Hand Lens and differentiate from other minerals which are similar in appearance under normal light. Others may shine in a variety of bright, luminous colours under Superior quality polished alloy steel hand UV light. This UV lamp comes with both shortwave and long wave light sources. lens for observation of rock and mineral The shortwave light is provided by a tube emitting UV at 254nm. The long specimens. 10x magnification, complete wave light is provided by a 4 mW LED emitting UV at 380nm. The shortwave with case. Dimensions (Dia.): 21mm. bulb is powered at 4 watts to ensure that minerals fluoresce better than when using most other small sized lamps. The lamp comes with a wrist strap and small fold out foot on one side, to allow the lamp to stand on a bench top or other surface. Requires 4x AA batteries (not included). Dimensions (D x L x W): 13 x 55 x 25mm. Care: Do not look directly into UV lights. MA104022 £5.31 ea Streak Plates For testing mineral streak (colour) to aid the identification of minerals. Dimensions: 40 x 40mm. LA140120 £43.69 ea EA91320 Quantity £7.41 pk SPARES & ACCESSORIES £1.95 pk 10 BA01983 2 x AA Batteries …inspiring tomorrow’s scientists through practical science. 258

Hydrological Models ● Fossils EARTH SCIENCE Ocean Currents Tank Ocean Currents Tank Thermostat This classic model for demonstrating ocean circulation (including the Waterproof, 50 W thermostatic heater for use with the Ocean Currents Tank Greenland Pump) was developed in collaboration with teachers. Made from model. The heater comes with auto shut-off function to protect the element clear acrylic, one side is painted white to make the ocean currents more visible. when not immersed. Food colouring (or other dye) should be added to the water to enhance the visibility of currents generated. Made from Schott DURAN splinter-free glass, which is resistant to thermal shock. Please note: the tank is supplied •• WITHOUT a heating element 50 W AC (EA170105). 230 V • Tank dimensions: 23 x 8 x 35 cm • Base plate dimensions: 14 x 39 cm EA170100 £107.44 ea EA170105 £26.19 ea Fossils Geo Safari Fossil Set Fossils, Single Specimens Set includes 9 different fossils in a 9-cavity vacuum formed tray, guide, 4-colour insert card of photographed fossils; foam sheet; and die cut sheet of circle A labels for fossils. Average fossil length approximately 25mm. Fossils included are: brachiopod, bryozoa, crinoid stem, gastropod, colony coral, ammonite, B shark’s tooth, fossil fern/plant matter, petrified wood. C MA84094 £18.06 set D 15 Specimen Genuine Fossil Set E Specimens are hand-picked to ensure morphological features can clearly be seen. A photo data sheet is present on the inside lid of a thick card box with plastic divisions. Specimens include: - Trilobite, Echinoid, Shark Tooth, Brachiopod, Sectioned Ammonite, Ammonite, Bivalves (x2), Plant, Sponge, Belemnite, Graptolite, Marine Reptile Bone, Crinoid Stem and Horn Coral. An ideal fossil collection for beginners, intermediate level students and private collectors. Box dimensions: 30cm x 18cm x 4cm deep. EA110200 Type £2.44 ea EN150200 £39.38 set EA110205 £2.44 ea EA110210 A Ammonite £4.94 pk EA110215 B Belemnite £4.94 pk EA110220 C Bivalve, pack of 5 £4.94 pk EA110225 £4.94 pk EA110230 Brachiopod, pack of 5 £2.44 ea EA110235 D Coral, pack of 5 £2.44 ea EA110240 E Crinoid stem, pack of 5 £4.94 ea EA110245 £2.44 ea EA110250 Gastropod £5.78 ea Sea Urchin (Echinoid) Trilobite Shark Tooth Insect in Copal (a resinous pre-Amber) Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 259

EARTH SCIENCE Rocks & Minerals Rock Sets Rock Board Geo Safari Rock Sets 8 rock samples bonded to a plastic board for demonstration or viewing. Samples include: Granite; Basalt; Porphyry; Slate; Marble; Gneiss; Limestone; Dig into some serious fun with these fascinating rock collection kits. Each Sandstone. collection features 12 handpicked rock specimens, chosen for their colour, texture and beauty. Each kit also includes an educational rock identification chart and activity guide. A B EA101315 £23.64 set MA84096 C £13.69 set 20 Specimen Rock And Mineral Boxed Set MA84098 £13.69 set MA84100 Type £12.44 set Ideal for school, college, university or individual use, the specimens are MA84102 A Igneous Rock Set £13.69 set supplied in a strong cardboard box, complete with a coloured data sheet on the inside of the lid. The set includes: 1)Conglomerate 2)Sandstone 3)Oolitic Metamorphic Rock Set Limestone 4)Chalk 5)Pumice 6)Obsidian 7)Granite 8)Basalt 9)Marble 10) B Mineral Rock Set Slate 11)Calcite 12)Feldspar 13)Gypsum 14)Talc 15)Fluorite 16)Graphite C Sedimentary Rock Set 17)Rose Quartz 18)Pyrite 19)Rock Crystal 20)Biotite Mica. Box dimensions: 30cm x 25cm x 4cm deep. Class Rock Set A set of 55 rock samples (5 of each rock). Includes 5 samples of each of the following: Sandy Soil; Clay Soil; Sandstone; Limestone; Chalk; Slate; Garnet Gneiss; Marble; Gabbro; Granite; Basalt. EA150202 £56.13 set EN62605 £49.36 set 15 Specimen Rock Collection Set Set of 8 Rock Samples The specimens are supplied in a strong cardboard box, complete with a coloured data sheet on the inside of the lid. The set includes: 1)Granite 2)Basalt This rock set is the one previously offered and consists of 8 x 1kg bags of 3)Pumice 4)Obsidian 5)Conglomerate 6)Breccia 7)Sandstone 8)Shale 9)Chalk samples of 8 different rock types: Basalt, Granite, Limestone, Marble, Eocene 10)Crinoidal Limestone 11)Coal 12)Gneiss 13)Marble 14)Mica Schist. clay, Sandstone, Slate, Gneiss. Set comes complete with teaching notes. EN62628 £38.59 set EA150204 £33.58 set 260 …inspiring tomorrow’s scientists through practical science.

Rocks & Minerals EARTH SCIENCE Rock Sets continued Mineralogy and Petrology Set 20 Specimen Basic Rock Collection Boxed Set A set of 30 superb samples. Includes the following: Marble; Oolitic Limestone; Slate; Garnet Mica Schist; Sandstone; Quartzite; Gneiss with garnet; Andesite; This basic Rock collection boxed set comes with 20 specimens covering Orthoclase Feldspar; Coal; Unakite; Pumice; Talc; Chalk; Labradorite Feldspar; Igneous, Metamorphic and Sedimentary Rocks and is ideal for educational Sphalerite; Biotite Mica; Muscovite Mica; Rose Quartz; Basalt; Larvikite; Talc or individual use, at both starter and intermediate level. The specimens are Schist; Fluorite; Calcite; Carboniferous Limestone; Bubble Basalt; Barite; approx. 5 x 5cm (2” x 2”) in size and are supplied in a strong cardboard Rhyolite; Sulphur; Gypsum (anhydrite.) box complete with a colour photo data sheet on the inside of the lid. The set includes: 1)Granite 2)Gabbro 3)Obsidian 4)Pumice 5)Basalt 6)Meta quartzite 7)White Marble 8)Slate 9)Mica Schist 10)Gneiss 11)Conglomerate 12)Breccia 13)Permian Sandstone 14)Carboniferous Sandstone 15)Shale 16)Oolitic Limestone 17)Chalk 18)Crinoidal Limestone 19)Bituminous Coal 20)Flint EA150206 £44.04 set EN62635 £59.54 set Igneous Rock Specimens 15 Specimen Boxed Igneous Rock Set Igneous Rock Sample Packs This high quality Igneous Rock boxed set comes with 15 hand-picked Igneous Rock specimens and is ideal for educational use in schools and colleges or Approximately 1kg packs of rock samples (except where indicated). individual use at home for private collectors. Each specimens is carefully selected, broken to the correct size, bagged & supplied in a strong card board A box complete with a coloured photo data sheet with names and localities on the inside of the lid. The set includes: 1)Biotite Granite 2)Adamellite Granite 3) Syenite 4)Diorite 5)Gabbro 6)Micro Granite 7)Olivine Dolerite 8)Rhyolite 9) Obsidian 10)Pumice 11)Pitchstone 12)Andesite 13)Basalt 14)Birds Eye Lapilli Tuff 15)Agglomerate. Box dimensions: 30cm x 18cm x 4cm deep. B C EN150210 £33.58 set Igneous Rock Set, Advanced Set of 12 quality igneous rock samples, each labelled with a number that corresponds to an identification key (supplied with the set). Comes supplied in a durable plastic box with compartmented insert and includes teaching notes. Samples include: Granite; Basalt; Gabbro; Pumice; Larkavite; Porphyry; Pegmatite; Dolerite; Diorite; Tuff; Obsidian. EN62610 Type £6.19 pk EA101320 £48.89 set EA110440 £6.24 pk EA110445 Basalt £6.19 pk EA110450 Amydaloidal Basalt £6.19 pk EN62616 Dolerite £6.19 pk EA110460 Gabbro £6.91 pk EA110465 A Granite £6.24 pk EA110470 Biotite Granite £6.19 ea EA110480 Shap Granite £6.19 ea EA110485 B Obsidian - 0.5kg only £6.19 pk C Pumice - 250g only Rhyolite Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 261

EARTH SCIENCE Rocks & Minerals Metamorphic Rock Specimens Sedimentary Rock Specimens Metamorphic Rock Samples Packs Sedimentary Rock Sample Packs Approximately 1kg packs of rock samples. Approximately 1kg packs of rock samples (except where indicated). B A C A B EA110490 Type £6.19 pk EA110515 Type £6.19 pk EA110495 £6.19 pk EA110520 £6.19 pk EA110500 A Gneiss £6.19 pk EA110525 A Breccia £6.19 pk EA110505 B Marble, white £6.19 pk EA110530 Chalk £6.19 pk EA110510 £6.19 pk EA110540 Coal (Anthracite) £6.16 pk Metaquartzite EN62618 Conglomerate £6.19 pk Mica Schist EA110555 Flint £6.19 pk Slate EA110560 Limestone £6.19 pk EA110565 Limestone, Crinoidal £6.19 pk EA110570 Limestone, Oolitic £6.19 pk EA110575 Limestone, Shelly £6.95 pk EN62624 Mudstone £6.19 pk EA110585 Rock Salt - 0.5kg only £6.19 pk EA110590 Sandstone £6.19 pk EA110595 £6.19 pk B Sandstone, Desert Sandstone, Torridonian C Shale, Fossiliferous 10 Specimen Boxed Metamorphic Rock Set 15 Specimen Boxed Sedimentary Rock Set The Metamorphic Rock Boxed set comes with 10 hand selected Metamorphic This Sedimentary Rock set comes with 15 Sedimentary specimens and is Rock specimens and is ideal for educational school & college use or individual ideal for educational use in schools and colleges or individual use at home. use. The specimens are supplied in a strong cardboard box complete with a The specimens are carefully selected, broken to show specific features and coloured photo data sheet on the inside of the lid which details the names are supplied in a strong cardboard box complete with a coloured photo of specimens included and localities found. The set includes: 1)Spotted Slate data sheet on the inside of the lid detailing the names of specimens and 2)Chiastolite Slate 3)Corderite Hornfels 4)Slate 5)Phyllite 6)Garnet Mica locations found. The set includes: 1)Conglomerate 2)Breccia 3)Coal Measures Schist 7)Mica Schist 8)Meta quartzite 9)Marble 10)Gneiss. Box dimensions: Sandstone 4)Sand Stone - Permian 5)Micaceous Sandstone 6)Quartzite, 7) 30cm x 12cm x 4cm deep. Siltstone 8)Kimmeridge Clay 9)Mudstone 10)Fossiliferous Shale 11)Chalk 12) Oolitic Limestone 13)Crinoidal Limestone 14)Bituminous Coal 15)Flint. Box dimensions: 30cm x 18cm x 4cm deep. EN150220 £26.16 set EN150230 £33.58 set 262 …inspiring tomorrow’s scientists through practical science.

Rocks & Minerals EARTH SCIENCE Mineral Specimens 15 Specimen Mineral Collection Set The set contains 15 mineral specimens, is ideal as an aid for entry level students or collectors and includes individually selected specimens. The set also includes a colour photo data sheet detailing names of specimens and localities on the inside of the lid. The set is supplied in a cardbox with divisions. Specimens included: 1)Milky Quartz 2)Orthoclase Feldspare 3)Biotite Mica 4) Native Copper 5)Hematite 6)Magnetite 7)Halite 8)Fluorite 9)Calcite 10)Gypsum 11)Barite 12)Iron Pyrite 13)Chalco pyrite 14)Galena 15)Zinc Blende EA150200 £31.15 set Minerals, Single Specimens and Sample Packs G E Mineral (and 1 rock) specimens available as separate specimens or sample D packs, for demonstration or student use. Separate specimen sizes approx. 20 x 30 mm, but will vary. Pack quantity approx. 0.5 kg of varying sizes. EA110255 Type Quantity £2.07 ea F EA110275 £1.85 ea EA110280 A Amethyst Specimen £6.19 pk EA110285 B Barite (Barytes), Cockscomb form Specimen £5.25 pk EA110295 0.5 kg £6.20 pk EA110300 Bauxite 0.5 kg £4.31 ea EA110305 Calcite 0.5 kg £2.46 ea EA110310 C Chalcopyrite Specimen £6.20 pk EA110315 Copper, Native Specimen £6.20 pk EA110325 Dolomite, crystals 0.5 kg £3.70 ea EA110330 Feldspar, Orthoclase 0.5 kg £2.46 ea EA91340 Feldspar, Plagioclase Specimen £4.94 ea EA110350 D Galena Specimen £5.68 pk EA110355 Garnet Specimen £3.09 pk EA110365 Graphite 0.5 kg £2.42 ea EA101332 Halite (rock salt) Specimen £3.13 ea EA110380 E Hematite, kidney ore Specimen £8.69 pk EA101334 Magnetite Specimen £2.35 ea EA110400 Malachite 0.5 kg £2.46 ea EA110405 Mica, Muscovite Specimen £5.25 pk EA110410 F Obsidian (actually a glassy rock) Specimen £6.20 pk EA101339 Pyrite (Iron pyrites) 0.5 kg £0.63 ea EA110420 G Quartz, milky 0.5 kg £15.55 pk Quartz, clear Specimen Quartz, rock crystal points 0.5 kg Quartz, rock crystal points LINKED To help you with your ordering, see also… PRODUCTS Clever Catch Balls (page 656) C A B Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 263

EARTH SCIENCE Rocks & Minerals Mineral Specimens continued Quartz Family Of Minerals Boxed Set The chemical formula of all members of the Quartz family is Silicon dioxide, which constitutes 60% of the earth’s crust, with only a small amount of impurity, in many cases an iron oxide. Quartz produces gemstones in a variety of colours, and the use of Quartz varies from native weapons to the finest of jewellery. This collection aims to cover the most popular minerals found under the Quartz family to show the variety of forms Quartz can take. Included in this set is also a colour photo identification sheet with names and details of the specimens featured on the inside of the lid. This set includes: - Rock Crystal; Smokey Quartz; Amethyst; Milky Quartz; Green Aventurine; Rose Quartz; Citrine; Rutilated Quartz; Carnelian; Agate Slice; Moss Agate; Flint; Chert; Dyed Coloured Agate. EA150208 £30.60 set HHaarrddnneessss TTeessttiinngg Mohs Mineral Hardness Sample Set Mohs Hardness Testing Pencil Set Our Mohs mineral sample set contains 9 samples of minerals with hardness values 1 - 9 (does not include diamond, hardness 10). A set of 7 hardness testing pencils containing minerals and metal alloys that correspond to the Mohs scale of hardness. Constructed from brass holders Contents: Talc, Gypsum, Calcite, Fluorite, Apatite, Feldspar, Quartz, Topaz, mounted on wooden handles. The minerals and metal alloys represent Corundum. hardness values of 3-9 from the Mohs scale. Supplied with a plastic case and instruction leaflet. EA91325 £37.39 set MOHS HARDNESS SCALE Softest Hardness Mineral EA101346 £15.51 set Hardest 1 Talc 2 3 Gypsum 4 Calcite 5 Fluorite 6 Apatite 7 Orthoclase Feldspar 8 Quartz 9 Topaz 10 Corundum Diamond 264 …inspiring tomorrow’s scientists through practical science.

265 ELECTRICITY & ELECTRONICS Basic Electricity System (BES) 266 Soldering294 Worcester Circuit Boards 268 Electrical Measurement 296 Electronic Project Kits 269 Oscilloscopes301 Locktronics270 Capacitance & Charging 304 Leads276 Resistance304 Plugs278 Transformers307 Sockets278 Rectifiers310 Bulb Holders 279 Mains Accessories 310 Bulbs280 Fuses311 Crocodile Clips 283 Wire312 Components283

ELECTRICITY & ELECTRONICS Basic Electricity System (BES) BES Kits Benchmark™ Basic Electricity System - BES Kit Starter Kit Standard Kit Advanced Kit Code EL130900 EL30260 EL130905 Lamp Holders 6 6 Cell Holders 6 6 6 Push Switches 4 2 2 Changeover Switches 2 2 1 Motors 1 2 Buzzers 5 1 2 Component Holders 5 1 2 Potentiometers Yes 1 10 ohm resistors £68.69 kit 5 2 20 ohm resistors 5 2 Diodes Yes 1 LDRs £99.94 kit 1 Red LEDs 2 Red Leads 10 Black Leads 10 Teachers' Notes Yes Price £181.19 kit MAINS VOLTAGE AND FREQUENCY Mains power consists of alternating current (AC), with different voltages and Previously, Europe operated on 220 V and the UK on 240 V.€ frequencies in different countries. In general, the range lies between 100 and However, this was later standardised to 230 V, which is within the 10 % 240 volts, at frequencies of either 50 or 60 hertz (i.e. the number of times the tolerance of both of the old standards, so no change is required in either current reverses its direction per second, being 50 or 60). system.€ With the exception of filament bulbs, equipment used in Europe is designed to work on any voltage in the accepted range. The following mains voltages and frequencies apply: Therefore, an appliance rated at 230 V will work on voltages between 220 V UK 230 V 50 Hz and 250 V (which is still in use in some parts of the UK). Europe 230 V 50 Hz USA 120 V 60 Hz 266 …inspiring tomorrow’s scientists through practical science.

Basic Electricity System (BES) ELECTRICITY & ELECTRONICS BES Components Benchmark™ BES Components A O B P For use in conjunction with the B.E.S or as stand-alone mounted components. C Q D R Type E S F T EL30270 A Lamp Holder £5.24 ea G U EL30272 £4.74 ea H V EL30274 B Cell Holder (1 x C Cell) £4.85 ea I W EL140175 £5.01 ea J X EL30276 C Push Switch £5.18 ea Y EL120945 £7.40 ea Z EL30278 D Toggle Switch £4.91 ea EL30280 £5.71 ea EL120940 E Changeover Switch £4.18 ea EL140180 £4.18 ea EL30282 F Reed Switch £4.14 ea EL120905 £3.05 ea EL180910 G Buzzer 2-5V £3.05 ea EL120915 £3.05 ea EL140145 H Motor 3-6V £3.05 ea EL120920 £3.05 ea EL120925 I LED, Red £3.05 ea EL140150 £3.05 ea EL30284 J LED, Green £8.73 ea EL120930 £3.05 ea EL150200 K Component Holder £6.25 ea EL140155 £3.96 ea EL140160 L 10 Ω Resistor ✓ £10.71 ea EL120935 M 22 Ω Resistor £5.14 ea EL140165 N 50 Ω Resistor £5.80 ea EL140170 O 82Ω Resistor £12.51 ea EL120950 P 100 Ω Resistor £17.09 ea EL120585 Q 1K Ω Resistor £6.50 pk EL120610 R 330Ω Resistor £6.75 pk EL120615 S Potentiometer 50 Ω, 5W £6.75 pk T Diode U Thermistor, 4.7K Ω V 2200µF Capacitor W 10F Super Capacitor X LDR Y Phototransistor Z Photodiode AA Crystal Microphone Stackable Plug Leads, 4€mm, 250 mm (L), Red, Pack of 5 Stackable Plug Leads, 4€mm, 500 mm (L), Red, Pack of 5 Stackable Plug Leads, 4€mm, 500 mm (L), Black, Pack of 5 Multi Lamp & Switch Unit This useful unit includes four low voltage lamp holders connected in parallel and mounted on a BES type base. Individual switches control each lamp, allowing all, some, or none of the lamps to be lit. Four colour-coded 4mm sockets can be used to link multiple sets together or to connect a power supply and Voltage and Current sensors or meters. Unit comprises: 4 On/Off toggle switches; 4 x 4 mm sockets; 4 lamp holders - supplied without bulbs, which are available separately. •Suggested uses: Use a hand powered generator (EN98100) to feel the increase in power • and energy needed to successively light more lamps. Use with a battery or power supply to study the relationship between voltage, current and resistance. • Useful for studying power, efficiency, and Ohm’s law in a simple circuit. • Simple to use and quick to set up, as individual components do not need to be connected together to make a circuit. K L M EL140190 £12.46 ea N AA SPARES & ACCESSORIES ✗ £2.91 pk EL06661 Bulbs MES Cap, 0.06 A, 6.0 V x 10 Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 267

ELECTRICITY & ELECTRONICS Worcester Circuit Boards BEST Worcester Circuit Board Worcester Circuit Board Kit, MK 2 SELLER An updated version of the Worcester circuit board kit, using high quality plastic connectors with brass wire inserts to make the connections. Can be used with bench top power supply or batteries (not supplied). Neater and easier to use than the traditional Worcester Circuit Board kits, with no sharp edges. K•••••••••••••••••it2S119111G1121T2S2cett26oreucbccccprrpbaaeenroiooeduuolcbcroapdstiiilochetslulllaicchbeuhswnnelwoooskiinbtinnrttthootdffsieets’wsreaowirsobiwwe:oelcrcilleoiglrsdmoihtttreiaicuwednicevsethrilriesgiddittser1pyeeewsb9srsa2ihsrr8ewesegs2tw4sgswg EL160700 Quantity ✓ £85.00 kit £39.46 ea SPARES & ACCESSORIES 1 £16.69 pk Type 10 £7.53 pk 5 £4.70 pk EL160710 Baseboard 2 £4.13 ea EL160712 Plain Connector 1 EL160714 Lamp Connector EL160716 Push Switch Connector EL160718 Rheostat Connector Worcester Circuit Board Components Spares & Accessories for Worcester Circuit Board, MK 1 EL30225 Type Quantity £10.55 pk EL30226 £17.04 pk EL30227 Plain Connector 12 EL30228 Lamp Connector 9 £9.53 pk EL30229 Mounted Bell Push 2 £7.26 ea BA01985 Rheostat Connector 1 £34.95 ea EL06661 Circuit Board only 1 £4.43 pk C Batteries 2 £2.91 pk Bulbs, MES Cap 10 268 …inspiring tomorrow’s scientists through practical science.

Electronic Project Kits ELECTRICITY & ELECTRONICS Transistor Radio Project Kit LED Christmas Tree Project Kit An easy to build transistor radio kit which is ideal for educational projects. A simple to build festive project supplied with comprehensive instructions. Includes all the components required to build a miniature AM radio. Supplied Contains all the components required for this mini-project. Requires 1x with mini- earphones and requires a PP3 battery (not included). Comprehensive PP3 battery (not included). instructions are included. EL110800 £16.88 kit Voice Changer Project Kit EL110820 £6.01 kit SPARES & ACCESSORIES £3.83 ea A kit which provides numerous selectable tones enabling the user to change BA01970 PP3 Battery the tone of their voice, including robot, low tone, high tone and vibrato effects. Includes all components and full instructions. Requires 9V battery (not included). LINKED To help you with your ordering, see also... PRODUCTS Soldering (page 294-295) EL110815 £12.26 kit Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 269

ELECTRICITY & ELECTRONICS Locktronics Locktronics is a range of products that simplifies Spring clips riveted on the process of learning and teaching electricity and for strength. electronics. The core range consists of more than 200 electronic components mounted Components identifiable on rugged plastic carriers which are printed with the corresponding circuit under carrier symbol. Students use these carriers, in conjunction with a baseboard with interconnecting metal pillars, to build up a working circuit. They then use the Circuit symbol bonded software and curriculum provided to carry out experiments in electricity and onto plastic carrier electronics. The key benefit of Locktronics is that as students construct the working circuit Strong soldered joints Component value they can also see the corresponding circuit diagram. This helps students Simple repairs can be easily identified link theory to practice and simplifies the process of learning electricity and made in-house electronics. Durable, robust Locktronics is used in more than 10,000 schools worldwide. plastic carriers are long-lasting and Teachers and students like to use Locktronics for a number of reasons: cost effective • Students can see the circuit diagram and the real circuit Most up to date circuit Rust proof spring • Circuits are fast to build and easy to work with symbols now available clips ensure a • Support materials guide students step-by-step good connection • Locktronics is reliable and works year after year The range includes: Custom-made metal clips • Curriculum and worksheets are provided can be bent many times • Components mounted on rugged plastic carriers • Simple, effective, strong baseboards BASEBOARDS • Component legend bonded to plastic carriers • Can be used in many subject areas, at many levels POWER • Vast range of components SUPPLIES • Ideal for demonstrations, practicals and projects • Components and curriculum now updated To which students add… • 12 month guarantee on all items • Technical telephone support on all products CAPACITORS RESISTORS INDUCTORS PLEASE NOTE: Baseboards arrive flat-packed and have to be assembled by the user. SEMICONDUCTORS LOGIC GATES SYSTEM BLOCKS CHOOSING THE RIGHT SOLUTION CHOOSING A KIT Kits are supplied in blister packs, containing just the carriers, or as complete solutions with storage trays, baseboards, power supplies, and leads. CHOOSING ACCESSORIES AND EXTRAS If blister packs are chosen, be sure to order baseboards, leads and power supplies separately. Datasheets showing complete contents of each product are available online. MAKING UP YOUR OWN KIT If the kits we have don’t suit, it is possible to make up bespoke kits from the list of parts - see pages 290 and 291. CHOOSING ADDITIONAL MANUALS AND PARTS Updated manuals can be downloaded free from the Locktronics web site and Timstar can supply additional components which will allow you to deliver new courses. IMPROVEMENTS & NEW POWER SUPPLY SMALL CARRIER IMPROVEMENTS. Many minor changes have been made to the designs of existing carriers - for example the lampholder now includes the appropriate circuit symbol. NEW LOW COST POWER SUPPLIES New power supplies make a practical alternative to batteries and traditional PSUs whilst keeping the circuit diagram intact. ELECTRO- LAMPS CURRICULUM MECHANICAL AND LEDS PACKS 270 …inspiring tomorrow’s scientists through practical science.

Locktronics ELECTRICITY & ELECTRONICS Locktronics Kits Electrical and Electronic Principles Kit Class Pool Kit This kit provides a comprehensive range of practical assignments for electricity and magnetism and is ideal for those who are studying science and electricity This ‘one per class’ kit is designed to give you a flexible suite of parts that can for science students. The kit is supplied with a comprehensive set of worksheets be added to the Electrical and electronic principles pack to allow a much wider that cover the electrical and electronic principles. Suitable for students of range of experiments and demonstrations in Electronics, from Operational Physics aged 16 to 18. Amplifiers, PICmicro, Logic and Energy and Environment solutions. The pack also includes useful equipment for teaching Lenz’s law, Faraday’s law and Kit contains: motor principles. This pack is suitable for Physics extension work and projects. The CD ROM supplied includes workbooks in Energy and Environment, • Plastic trays & lids PICmicro investigations, Operational amplifiers and working with logic gates. • 1 Power supply • 1 Small bar magnet Kit contains: • 3 MES bulb, 6V, 0.04A • 2 MES bulbs, 6.5V, 0.3A • 1 Capacitor, 22,000µF, Electrolytic 16V • 1 Resistor, variable, 250 ohm • 1 Locktronics User Guide • 1 Resistor, 10 ohm, 1W 5% (DIN) • 1 Resistor, 100 ohm, 1W, 5% (DIN) • 1 Resistor, 47 ohm, 1/2W, 5% (DIN) • 1 Capacitor, 1,000 µF, Electrolytic 30V • 1 Low power solar motor • 1 Resistor, 10 ohm, 1W 5% (DIN) • 1 USB reprogrammable PIC carrier with power leads • 1 Resistor, 47 ohm, 1/2W, 5% (DIN) • 1 Hand cranked generator • 1 Transformer, 2:1 turns ratio • 2 Resistors, 10k, 1/4W, 5% (DIN) • 1 Light dependent resistor • 1 Resistor, 270k, 1/4W, 5% (DIN) • 1Resistor, 1k, 1/4W, 5% (DIN) • 1 Resistor, 120 ohm, 1/2W, 5% (DIN) • 1 Resistor, 10k, 1/4W, 5% (DIN) • 1 Resistor, 180 ohm, 1/2W, 5% (DIN) • 1 Resistor, 270 ohm, 1/2W, 5% (DIN) • 1 Potentiometer, 25 ohm (DIN) • 1 Potentiometer, 250 ohm (DIN) • 1 Potentiometer, 10k (DIN) • 1 Resistor, 5.6k, 1/4W, 5% (DIN) • 1 Resistor, 100k, 1/4W, 5% (DIN) • 1 Resistor, 3.9 ohm, 3W, 5% (DIN) • 2 Capacitors, 10 µF, Electrolytic, 25V • 1 Resistor, 68 ohm 1/2W, 5% (DIN) • 1 Capacitor, 0.1 µF, Polyester • 12 Connecting Links • 1 Diode, power, 1A, 50V • 3 Lamp holders, MES • 4 Connecting Links • 1 x 400 turn induction coil • 1 Bridge rectifier • 1 Thermistor, 4.7k, NTC (DIN) • 1 Lamp holders, MES, for automotive LED’s • 1 Capacitor, 2,200 µF, Electrolytic, 25V • 2 x 400 turn induction coil • 1 Capacitor, 1 µF, Polyester • 1 Thermistor, 470 ohm, NTC (DIN) • 1 Switch, on/off, metal strip • 1 Thermistor, 4.7k, NTC (DIN) • 1 Resistor, 22k, 1/4W, 5% (DIN) • 2 Leads, red, 300mm, 4mm to 2mm stackable • 1 Choke, 47mH • 2 Leads, black, 300mm, 4mm to 2mm stackable • 1 Resistor, 2.2k, 1/4W, 5% (DIN) • 1 Lead, black, 500mm, 4mm to 4mm stackable • 1 LED, red, 12V (SB) • 2 Leads, yellow, 500mm, 4mm to 4mm stackable • 1 Curriculum CD ROM • 2 Leads, blue, 500mm, 4mm to 4mm stackable • 3 AA battery holder carrier • 1 Capacitor, 100µF, Electrolytic, 25V • 1 x 1:1 transformer with retractable ferrite core • 1 Capacitor, 1 µF, Polyester • 1 Nichrome Wire Carrier, 0.075 x 500mm • 1 Capacitor, 4.7µF, electrolytic, 25V • 1 Nichrome Wire Carrier, 0.075 x 250mm • 1 Switch, push to make, metal strip • 1 Nichrome Wire Carrier, 0.21 x 500mm • 1 Switch, on/off, metal strip • 1 Constantan Wire Carrier, 0.075 x 500mm • 1 Resistor, 22k, 1/4W, 5% (DIN) • 1 Power supply carrier with battery symbol • 1 Choke, 10mH • 7 x 5 metric baseboard with 4mm pillars • 1 Op Amp module (TL081) • 2 LED’s, red, 12V (SB) Topics students can study include: • 1 LED, yellow, 12V (SB) • 1 LED, green, 12V (SB) • Batteries in series and parallel • 1 Fleming’s motor rule apparatus • Internal resistance of batteries • 1 Motor 3 to 12V DC, 0.7A • Power dissipation and efficiency • 1 Slotted opto sensor with 2mm to 4mm lead • Potential dividers • 1 MES bulb, 12V, LED, white • Resistivity • 1 AND Gate with 2mm to 4mm lead - ANSI • Kirchoff’s laws • AC circuits • Capacitors • Transformers • 1 OR Gate with 2mm to 4mm lead - ANSI • 1 NOT Gate with 2mm to 4mm lead - ANSI • 1 NAND Gate with 2mm to 4mm lead - ANSI • 1 NOR Gate with 2mm to 4mm lead - ANSI •• 1 Lenz’s law kit 1 Faraday’s law kit • 1 Solar cell • 1 Energy Meter • 1 Speaker • 1 Choke, 200mH EL130800 £847.76 kit EL130810 £446.44 kit Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 271

ELECTRICITY & ELECTRONICS Locktronics Locktronics Kits continued Electricity Magnetism & Materials Kit Fundamentals of Electricity Solution Kit This kit provides a comprehensive range of practical assignments into electricity This kit is a complete teaching and storage solution with classroom friendly and magnetism and is ideal for those who are studying science and electricity trays and foam to keep carriers tidy and secure. The solution comes with a within a wide variety of academic or vocational courses. The kit is supplied baseboard with battery retaining clips, a power supply and power supply with a comprehensive set of worksheets that covers the electrical properties of carrier allowing you to choose the most appropriate power source for teaching materials, and introduces students to electricity. Suitable for pupils from age simple circuits. Extensive curriculum is provided to guide the teaching and 11 upwards. learning of electricity required at Key Stage 2. Kit contains: Kit contains: • 1 Locktronics blister pack clear tray & insert • 1 x Deep storage tray with lid, foam insert and daughter tray • 1 Adjustable DC power supply • 1 x International power supply • 2 BNC male to dual 4mm binding posts • 3 x 2.5V, 0.2A MES bulbs • 1 AC voltage source carrier • 1 x Locktronics baseboard with battery retaining clips • 1 Resistor, 100 ohm, 1W, 5% (DIN) •• 9 x Connecting Links • 1 Low power solar motor 3 x Lampholder carriers • 1 Resistor, 1k, 1/4W, 5% (DIN) • 1 x 75mm black lead • 2 Resistors, 10k, 1/4W, 5% (DIN) • 1 x 75mm red lead • 1 Potentiometer, 10k (DIN) • 1 x Press switch • 1 Capacitor, 0.1 µF, Polyester • 1 x On/off switch • 9 Connecting Links • 1 x Buzzer • 1 Thermistor, 470 ohm, NTC (DIN) • 1 x Motor • 2 Leads, red, 500mm, 4mm to 4mm stackable • 1 x Curriculum pack CD ROM • 3 Leads, black, 500mm, 4mm to 4mm stackable • 1 x Power supply carrier with battery symbol • 1 Lead, blue, 500mm, 4mm to 4mm stackable • 1 Capacitor, 100µF, Electrolytic, 25V • 1 Capacitor, 1 µF, Polyester • 1 Op Amp Carrier (TL081) with 2mm to 4mm Lead • 1 LED, red, 12V (SB) • 1 LED, green, 12V (SB) • 1 Dual rail power supply carrier • 1 Speaker • 1 Voltmeter, +/- 7.5V The following experiments and learning objectives are covered: • Electrical properties of materials • Simple circuits • Heat and magnetism • Basic circuit symbols • Current flow • Series and parallel circuits • Patterns of voltage and current • Electrical sensors • Relays and electromagnets LK96444 £143.69 kit Advanced Electronic Principles The experiments in this Locktronics solution are designed for the more advanced students of electronics who need to understand the theory and practice of a wide range of electronic components and circuits, from basic diode circuits through to feedback and oscillator design. LK129071 £297.21 kit LK161337 £813.75 ea 272 …inspiring tomorrow’s scientists through practical science.

Locktronics ELECTRICITY & ELECTRONICS Locktronics Kits continued Locktronics Sequential logic add-on kit. Locktronics Combinational logic add-on kit The worksheets used with this add-on kit assume customers already have one of the basic Locktronics kits, such as LK129071, as well as the Combinational This kit is designed as an add-on, to be used in conjunction with the logic add-on pack, LK166904. Together these kits allow students to do LK129071 kit, allowing extended work in understanding logic gates and extended work in understanding sequential logic circuits and systems. The combinational logic systems. The pack starts by allowing students to understand pack starts by allowing students to understand basic flip flop operation and basic logic gate operation and builds up to circuits and systems with up to four builds up to the design for circuits and systems with three flip flops. A full colour logic gates. A full set of worksheets and teachers’ notes are provided. workbook with teachers’ notes is included. Key Features: Key Features: • Logic gates NOT, AND, NAND, OR, NOR, XOR • Three input gates • JK Bistable • Equivalent gates • D-type flip flop • Boolean expressions • Monostables and bistables • C ombinational logic circuits: adder, • Synchronous and asynchronous circuits • Debounce circuits e ncoder, multiplexer LK166904 £492.20 ea LK166905 £262.50 ea Locktronics Demo panel Principles of Electronic Devices & Circuits This Locktronics demo panel is constructed from rugged extruded aluminium This solution provides a practical introduction to basic electronic devices and is designed to carry Locktronics components, enabling teachers to and analogue and digital electronic principles, providing learners with an demonstrate how students should build circuits on their own boards etc. opportunity to investigate the operation of diodes, transistors, operational amplifiers, logic gates and their associated circuits. • Rugged, desk-mounted experimentation platform • 10 x 7 grid extended baseboard LK160900 £459.39 ea LK160300 £1,487.08 ea Locktronics Operational amplifiers add-on kit Transistor Add-on Pack (DIN) An addition to the add-on range, this pack can be used in conjunction with the This add-on pack includes an op-amp and associated component carriers LK129071 kit to help students to understand the use of transistors in amplifier which facilitate the study of op amp circuits and should be used in conjunction circuits.€ Students construct a number of different types and classes of transistor with the LK129071 kit. This kit only contains the component carriers - amplifiers included classes A, B and AB and analyse their behaviour. baseboards, power supplies and storage trays should be bought separately. Material on the worksheets includes: • Comparators • Non-inverting amplifiers • Inverting amplifiers • Summing amplifiers • Schmitt trigger circuit • Relaxation oscillator • RC time constant •Key Features: Carriers only - baseboard and batteries not included • Worksheets provided • NB - Photo is not of an LK6906 LK166906 £261.20 ea LK160700 £261.20 ea Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 273

ELECTRICITY & ELECTRONICS Locktronics Locktronics continued Ammeters Locktronics Components These moving coil meters are fitted onto a large carrier and provide an easy Voltmeters visual reading of both voltage and current. These moving coil meters are fitted onto a large carrier and provide an easy visual reading of both voltage and current. Range LK109381 Range £27.15 ea LK108397 £32.84 ea 0-15 V 0-100 mA -7.5 V-+7.5 V 0-1A LK103982 £25.65 ea Semi Conductors LK109438 £27.93 ea Resistors £4.45 ea LK95242 Size Type £6.21 ea £3.84 ea LK95243 £3.63 ea LK95211 Size Type £3.66 ea LK95245 Small Diode (OA91) £3.33 ea LK94025 Resistor - 3.9 Ω, 3W, 5% £3.90 ea LK95247 Small Diode (IN4001) Power 50V £4.16 ea LK95217 A Small Resistor - 10 Ω, 1W, 5% £3.74 ea LK95253 Small Diode (IN4004) £5.20 ea LK94100 B Small Resistor - 68 Ω 12W, 5% £3.33 ea LK95254 A Small Zener diode (4.7V) £5.68 ea LK94002 Resistor - 12 Ω, 1W, 5% £3.56 ea LK95266 Small Zener diode (6.8V) £8.26 ea LK95206 Small Resistor - 100 Ω, 1W, 5% £3.33 ea LK95241 Small Zener diode (8.2V) £9.61 ea LK95207 Small Resistor - 120 Ω 12W, 5% £3.56 ea LK95240 B Large Bridge rectifier (1N4001) £9.07 ea LK95215 Small Resistor - 180 Ω 12W, 5% £3.33 ea LK95255 Large Transistor LHF - NPN £9.59 ea LK95205 Small Resistor - 220 Ω 12W, 5% £3.38 ea LK117361 Large Transistor RHF - NPN £8.66 ea LK96237 Small Resistor - 270 Ω 14W, 5% £3.33 ea Large Transistor RHF - PNP LK96219 Small Resistor - 500 Ω 14W, 5% £3.38 ea Small Photodiode (SFH217) LK95202 Small Resistor - 560 Ω 14W, 5% £3.56 ea LK96218 Small Resistor - 1K, 14W, 5% £3.33 ea AB LK95209 Small Resistor - 2.2K, 14W, 5% £3.33 ea LK95203 Small Resistor - 5.6K, 14W, 5% £3.56 ea Miscellaneous LK96211 Small Resistor - 10K, 14W, 5% £3.33 ea LK95201 Small Resistor - 22K, 14W, 5% £3.63 ea LK95250 Size Type £3.33 ea LK96231 Small Resistor - 33K, 14W, 5% £3.33 ea LK95251 £5.07 ea LK95218 Small Resistor - 50K, 14W, 5% £3.38 ea LK97936 Small Connecting Link £8.14 ea LK96212 Small Resistor - 100K, 14W, 5% £3.33 ea Large Crossover link £5.84 ea LK96238 Small Resistor - 150K, 14W, 5% £3.69 ea Small Fuse /universal £5.56 ea LK96201 Small Resistor - 200K, 14W, 5% £3.63 ea component carrier £4.93 ea LK96232 Small Resistor - 330K, 14W, 5% £3.38 ea £4.93 ea LK96200 Small Resistor - 500K, 14W, 5% £3.63 ea Optoelectronic and Light/Lamps £5.35 ea LK95210 Small Resistor - 1M, 14W, 5% £24.24 ea £5.26 ea LK95252 Small Resistor - 1.5M, 14W, 5% £27.36 ea £20.31 ea LK95212 Small Resistor - Rx £16.33 ea £8.90 ea LK95208 Small Resistor - variable, 25 Ω £13.21 ea LK94034 Small Resistor - variable, 250 Ω £12.38 ea LK95214 Large Resistor - variable, 1K £15.23 ea LK95219 Large Resistor - variable, 10K £7.50 ea LK95213 Large Resistor - variable, 100K £7.50 ea LK95401 Large Resistor - variable, 1M LK95402 C Large Thermistor 470 Ω, NTC Large Thermistor 47K, Ω, NTC D Small Small B A LK95287 Size Type LK95291 Small LK96432 A Small Automotive lampholder LK96635 Small Lampholder LK96636 B Small LED - green, 12V LK96637 Small LED - red, 5V LK97746 Small LED - green, 5V LK160100 LED - yellow, 5V C Small Solar cell Phototransistor B CD A C 274 …inspiring tomorrow’s scientists through practical science.

Locktronics ELECTRICITY & ELECTRONICS Locktronics Components continued Electromechanical Blank Carriers LK95900 Size Type £55.00 pk LK96706 Size Type £18.51 ea LK95800 £57.46 pk LK94102 Large £13.60 ea LK97215 A Large Blank carrier - large , pack of 10 LK95403 A Large Motor - 3/6V DC, 0.7A £29.78 ea LK97216 Small Blank carrier - small, pack of 20 £3.08 ea LK97889 Large Motor - open frame, 6V £33.25 ea LK98013 Small Blank DIN resistor carrier £3.08 ea LK95405 Large Relay 6V 10A (transparent case) £32.60 ea LK97217 Small Blank capacitor carrier £2.86 ea LK96633 B Small Relay 6V 10A changeover £12.31 ea LK97218 Small Blank diode carrier £3.14 ea LK96207 C Large Relay - reed Blank electrolytic capacitor carrier £5.31 ea LK95404 Small Switch, on/off £6.48 ea B Small Blank NPN transistor carrier LK96632 Switch Press (morse key-type strip, £9.11 ea Large LK96224 Small push to make) £20.31 ea LK96838 Large Switch, reed £12.80 ea LK96208 Large Switch, reversing £43.91 ea LK96634 Large Switch, toggle (SPCO) £11.54 ea LK96209 Large Solenoid £12.45 ea LK96423 Large Switch, changeover £8.35 ea Small Microswitch £13.86 ea Switch on/off (stay put, sideways Small swivel strip) Buzzer (6V, 15 mA) AB C Capacitors LK96205 Size Type £5.20 ea A LK96217 £6.93 ea B LK95221 Small Capacitor, 1 µF, Polyester £3.98 ea LK95224 Small Capacitor, 2.2 µF, Polyester £4.04 ea Power Supplies LK96202 Small Capacitor, 10 µF, Electrolytic, 25V £4.33 ea LK96223 Small Capacitor, 47 µF, Electrolytic, 75V £6.04 ea LK95223 Small Capacitor, 100 µF, Electrolytic, 25V £11.84 ea LK96203 Small Capacitor, 150 µF, Electrolytic, 25V £10.00 ea LK96653 Large Capacitor, 1,000 µF, Electrolytic, 16V £12.71 ea LK113662 Large Capacitor, 2,200 µF, Electrolytic, 25V £20.94 ea LK116214 Large Capacitor, 4,700 µF, Electrolytic, 16V £19.24 ea Large Capacitor, 22,000µF, Electrolytic, 16V Large Capacitor, Variable, 0-200pF Size Type A Large LK97461 Power supply carrier with voltage £10.00 ea source symbol £10.00 ea LK98275 Large Power supply carrier with battery £24.58 ea symbol £14.44 ea LK99218 B Adjustable power supply with battery symbol carrier LK180220 Plug-top PSU ✓ A B Inductors LK96214R3 Size Type £10.16 ea LK96214R1 £10.16 ea LK96214R2 Small Choke, 5 mH LK96215 Small Choke, 10 mH £8.82 ea Small Choke, 47 mH £16.70 ea Small Choke, 68 mH IC (Analogue) Baseboards and Spares LK96234 Size Type £45.28 ea LK98900 Type £53.19 ea Large Op Amp module (TL081) LK93000 £44.04 ea LK93293 A 7 x 5 pillars LK93288 B 4 x 4 pillars with battery holders £0.96 ea LK98615 £1.58 ea Pillar and bolt £1.30 ea Battery contact spring Battery retaining clip Logic Gates - CMOS AB LK96870 Size Type £32.41 ea LK96873 Large £32.40 ea LK96874 Large ‘AND’ - 0V lead, spade connector £32.41 ea LK96872 ‘NAND’ - +5V lead spade £32.41 ea LK96871 Large connector £32.41 ea Large ‘NOR’ - +5V lead spade connector Large ‘NOT’ ‘OR’ - +5V lead spade connector Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 275

ELECTRICITY & ELECTRONICS Leads Stackable Leads High Quality Stackable Leads, 4€mm Stackable Plug Leads, 2€mm Schutzinger brand professional quality 4€mm stackable test leads, utilising 1€mm2 double insulated highly flexible PVC cable and terminated at each end Length of flexible wire covered in colour coded P.V.C. terminated at each end with a stackable 4€mm plug. with a 2€mm in-line stackable plug. Sold in packs of 5. • Cable: 1.0 mm2 double insulated • PVC Plugs: Nickel plated brass body & lamella basket spring • Plug length: 48 mm • Voltage: 33 V AC / 70 V DC • Current (max): 16 A EL150500 Colour Length £3.74 ea EL150502 £3.74 ea EL150504 Red 250 mm ✓ £4.06 ea EL150506 Black 250 mm ✓ £4.06 ea EL150508 Red 500 mm £4.38 ea EL150510 Black 500 mm £4.38 ea Red 1000 mm Black 1000 mm EL06571 Colour Length ✓ £11.24 pk Shrouded Leads EL06572 ✓ £11.24 pk EL06573 Black 10 cm Shrouded Safety Leads EL06574 Red 10 cm £11.86 pk Black 30 cm £11.86 pk High quality leads with 4 mm stackable shrouded plugs at each end. Max Red 30 cm current 12 A. Length 15 cm. Stackable Plug Leads, 4€mm NEW These quality plug leads come with 4€mm stackable, insulated plugs and extra flexible 0.75€mm, 95/0.01€mm sheathed copper cable, which is rated at 15€A/60€V€DC. Supplied in packs of 5. EL180700 Colour ✓ £2.44 ea EL180702 ✓ £2.44 ea Red Black EL120585 Colour Length ✓ £6.50 pk EHT Leads EL120590 ✓ £6.50 pk EL120595 Red 250 mm 5kV lead. 50 cm length. EL120600 Black 250 mm £6.50 pk EL120605 Blue 250 mm ✓ £6.50 pk EL91360 Colour Length £6.73 ea EL120610 Yellow 250 mm EL91362 £6.73 ea EL120615 Green 250 mm £6.50 pk Red 50 cm EL120620 Red 500 mm ✓ £6.75 pk Black 50 cm EL120625 Black 500 mm ✓ £6.75 pk EL120630 Blue 500 mm Stackable Leads EL120635 Yellow 500 mm £6.75 pk EL120640 Green 500 mm ✓ £6.75 pk Plug To Socket Leads EL120645 Red 1000 mm EL120650 Black 1000 mm £6.75 pk A high quality extension lead consisting of highly flexible 384/0.05mm silicone EL120655 Blue 1000 mm ✓ £8.35 pk cable terminated at one end by a standard 4mm plug and a 4mm line socket Yellow 1000 mm ✓ £8.35 pk at the other. Green 1000 mm £8.35 pk ✓ £8.35 pk £8.35 pk Lead holder for 4mm leads, Steel Sturdy lab lead holder for wall mounting, using 2 screws. The holder is made from painted steel, with 13 slots, and can accommodate approximately 50 leads (leads not supplied). EL170952 £17.69 ea EL130956 Colour £5.53 ea EL130957 £5.53 ea 276 Red Black …inspiring tomorrow’s scientists through practical science.

Leads ELECTRICITY & ELECTRONICS Crocodile Clips BNC Leads Plug To Crocodile Clip Leads BNC Connecting Leads & Adapter Extra flexible leads with a 4 mm stackable Leads come ready assembled with moulded-on strain reliefs. plug at one end and a standard crocodile clip at the other. Length: 30 cm. Supplied in packs of 5. EL101412 Colour £10.77 pk EL101414 £10.77 pk Red Black Crocodile Lead Pack, Red & Black Vinyl covered crocodile clips, in packs of 20 (10 black and 10 red). Length 46 cm. BEST EL18512 Type £4.94 ea EL18513 £7.44 ea SELLER EL18514 BNC Plug to BNC Plug £10.31 ea EL18516 BNC Plug to Crocodile Clips £6.56 ea BNC Plug to Stackable 4mm Plugs BNC Plug to 4mm sockets EL170700 ✓ £6.63 pk 3.5 mm to 4 mm plug leads A 3.5€mm headphone plug connected to 2x€4€mm plugs, for taking audio output from an MP3 player, phone etc. Approximately 65€cm long. Crocodile Lead Pack, Assorted Colours EL160100 £8.69 ea Set of 10 leads, in five assorted colours. Terminated at each end with a vinyl sleeved crocodile clip. USB Leads USB Cables High speed USB 2.0 shielded cables for connecting computers and hardware. Data transfer rate of up to 480 Mbps. Also compatible with USB 1.1 devices. EL06567 £3.58 pk Crocodile Clips EL101392 Type Length £3.78 ea EL170394 £3.74 ea Nickel plated steel.Takes a 4 mm plug. EL170396 Male A to Male B 2m £3.74 ea 10 A max current. EL101396 Male A to Male mini-B 2m £3.78 ea Male A to Male micro-B 2m Male A to Female A 3m Serial Leads Quantity USB-to-Serial Cable (DB9 female) EL06565 10 £1.23 pk A high-end USB-to-serial adaptor cable, which converts an available USB EL06566 100 £12.73 pk 1.1 or 2.0 port into a serial port, allowing equipment with an RS232 interface to be connected to computers via a USB port. Crocodile Clips, Insulated The active electronics are enclosed in the cable, and it is powered by USB, so no additional adaptors or power supplies are required. Nickel plated steel with a PVC shroud to prevent accidental short circuits. Based on a FTDI USB UART chip, the cable features COM retention, which Connection is via permanently attached wire of maximum 1 mm thickness. Sold means the COM port value is automatically reassigned if the cable is in packs of 10. disconnected and reconnected, or the computer rebooted. • Current rating 5 A Compatible with Windows®, MacOS and Linux. ••••• • max opens up to A B 1 m cable Jaw USB Male A plug 7 mm DB9 female socket • 43 mm length 921.6 kbps max baud rate 2 year warranty EL18502 Colour £0.61 pk EL170232 £31.81 ea EL18500 £0.61 pk A Red B Black Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 277

ELECTRICITY & ELECTRONICS Plugs ● Sockets Banana Plugs 4 mm Stackable Plugs Solder connection, 4 mm pin. Pack of 5. Socket in the top providing an in-line stackable facility. The lead wire is clamped in position by a screw located at the bottom of the socket. Sold in packs of 5. EL066080 Colour Diameter £2.44 pk EL06590 Colour ✓ £5.09 pk EL066081 £2.44 pk EL06591 ✓ £5.09 pk Black 4 mm EL06592 Black Red 4 mm EL06593 Red £5.09 pk EL06594 Green ✓ £5.09 pk 4mm Stackable Plugs, Economy EL06595 Yellow Blue £5.09 pk White £5.09 pk An economical range of 4 mm stackable plugs, available in a range of colours. Transverse Hole Plugs The wire must be soldered into the plug. Connected by screw terminals, 4 mm pin For a video guide, go to timstar.co/SolderingEconomyPlugs with 4 mm cross hole. In packs of 5. Sold in packs of 10. •••••••• Brass body plated spring Beryllium copper, nickel DC PE housing EL066085 Colour £3.73 pk 3.5 mm cable diameter EL066086 £3.73 pk Solder contact Black Length 45 mm Red Voltage: 30 V AC - 60 V Maximum current rating 19 A A B C 4 mm socket to 2 mm plug Adapters DE F These adaptors convert a 4mm straight plug to a 2mm banana plug. They EL164000 Colour ✓ £2.42 pk have a nickel plated brass spring and are housed in ABS. EL164002 £2.42 pk EL164004 A Black £2.42 pk • Current rating: 32 A EL164006 B Blue • Voltage rating AC: 30 V EL164008 C Green ✓ £2.42 pk • Connector type: Banana plug to straight socket EL164010 D Red £2.42 pk • Contact material: Brass E White • Contact plating: Gold F Yellow ✓ £2.42 pk • Insulator material: ABS • Length: 44.9 mm EL170420 Colour £2.49 ea EL170422 £2.49 ea Red Black Sockets Terminal Sockets Insulated Sockets A 4 mm screw-socket which can be mounted on to panels up to 12.7 mm thick. Supplied in packs of 5. Safety sockets designed to accept sprung 4 mm plugs. Cable diameter can be •••• up to 5 mm diameter and cable connection requires soldering. Nickel plated Current: 10 A max mm brass socket with PVC insulated housing. Height above panel: 24-32 14 mm outer diameter • Voltage: 30 V AC, 60 V DC Thread size 4BA • Current: 16 A max EL130500 Colour £0.89 ea EL130505 £0.89 ea Black Red Insulated Panel Sockets 4 mm sockets, with solder connection which can be mounted in panels up to 13.5 mm thick. Mounting nut included. Supplied in •p•acVCkouslrtoraefgn1et0:: .11205AVmAaCx EL06611 Colour ✓ £3.25 pk EL06616 Colour ✓ £6.56 pk EL06612 ✓ £3.25 pk EL06617 ✓ £6.56 pk EL120550 Black EL110100 Black EL120555 Red £3.25 pk EL110215 Red £6.56 pk EL120560 Blue £3.25 pk EL110220 Green £6.56 pk EL120565 Green £3.25 pk EL110225 Blue ✓ £6.56 pk White ✓ £3.25 pk Yellow £6.56 pk Yellow White 278 …inspiring tomorrow’s scientists through practical science.

Bulb Holders ELECTRICITY & ELECTRONICS BC Bulb Holders ES Bulb Holders Cord Grip, Plastic, BC Fitting Lamp Holder, ES Fitting T2 temperature rating. 82 mm base diameter, 58 mm height. 60 W max recommended. BEST OP84690 £3.69 ea EL06550 SELLER Mains ES Lamp Holder ✓ £1.53 ea Batten, Plastic, BC Fitting Threaded E-27 (ES) lamp holder, mounted on a 100 mm long, 10 mm diameter support rod. Supplied without cord. Fitted with mains plug. Base not included. Can be mounted in retort base with screw clamp or in a bosshead. OP170695 £24.94 ea £29.94 ea SPARES & ACCESSORIES EL06555 £2.14 ea ST96274 Squat Retort Base MES Bulb Holders Lamp Base, MES (E10) SBC Bulb Holders Miniature MES lamp holder, suitable for all MES Batten, Brass lamps, terminated by solder tags at the base of the holder. Dimensions: 10mm diameter 11mm high. SBC, with base with screw holes to mount onto a surface. EL160000 Quantity £0.93 pk EL06562 £3.13 ea 10 Cord Grip, Brass Batten, Plastic SBC, to grip on to cable to suspend a bulb. BEST SELLER EL06560 Quantity ✓ £3.49 pk EL06563 £6.25 ea 10 A SBC Bulb Holder Bulb Holders In Series & Parallel B A brass SBC bulb holder mounted on a ABS box consisting of 4 MES bulb holders plastic base, with two 4 mm sockets for wired in series or parallel, to show how voltage electrical connection. Includes a 12 V and current are affected by different circuit 24 W SBC bulb. arrangements. Each box includes 4mm sockets for power input. Bulbs not included. NEW EL150202 Type £12.65 ea EL180564 ✓ £6.19 ea EL150204 £12.65 ea A Series B Parallel Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 279

ELECTRICITY & ELECTRONICS Bulbs BC Bulbs LED mains voltage lamps Daylight Bulbs Low energy mains light bulbs with instant on/off full brightness LED A range of 230V ‘daylight’ GLS bulbs which technology. Low power consumption, simulate natural daylight, offering enhanced long lasting, cool running and no colour rendition and improved contrast for mercury content, as found in the inspection, industrial lighting and other fluorescent type of low energy bulb. visually demanding applications. Non-dimmable. Colour Fitting Power Equivalent power Fitting Power EL160530 Warm White BC 5W 30 W ✗ £5.66 ea EL160535 Warm White BC 10 W £7.10 ea EL160800 BC 60 W ✓ ✗ £2.95 ea 60 W ✓✗ EL160805 BC 100 W ✗ £3.01 ea Halogen Energy Saving GLS Bulbs Carbon Filament Lamp Replacements Energy efficient replacements for 240 V Rough Service lamp which incandescent GLS mains voltage bulbs. adequately replaces the traditional These use 30€% less energy, have twice the carbon filament lamp but has the expected lifetime and are identical in size added benefit of being more robust. to the Tungsten filament (incandescent) Suitable for use in optics experiments equivalents which are no longer such as pinhole cameras, projection of available. They are also fully dimmable. an image, determining focal length of Voltage:€230€V€AC a lens etc. Fitting Power Equivalent Fitting Power ✗ £12.60 ea power OP110155 BC 40 W BC 28 W 40 W NEW EL130510 BC 42 W 60 W ✗ £3.31 ea LED Filament Mains Voltage Lamp EL130515 BC 70 W 100 W ✓✗ £3.31 ea EL130520 £3.31 ea LED filament bulbs use a string of ✗ fine LEDs to more closely mimic the operation of a classical incandescent Mains Bulbs, Energy Saving filament bulb, while retaining the low power and cool operation advantage Spiral-type, 230/240V mains voltage low of LEDs. energy light bulbs. These are not suitable for dimming or electronic switches. Bulbs use 5 times less energy than traditional bulbs and are expected to last 8000 hours, based on 3 hours per day burn time. Colour: Warm white. Colourz Fitting Power Equivalent power Fitting Power Equivalent OP180700 Warm White BC 5 W 30 W ✓✗ £7.44 ea power EL120510 BC 11 W 60 W ✗ £4.06 ea NON All bulbs are non returnable EL120520 BC 15 W 75 W ✗ £4.19 ea RETURNABLE EL120530 BC 20 W 100 W ✓✗ £4.88 ea EL120540 BC 30 W 150 W ✗ £5.84 ea COMMONLY USED LAMP (LIGHT BULB) FITTINGS Fittings Type SBC SBC BC LES MES SES ES Festoon Small Edison Edison Screw Festoon Name Small Bayonet Small Bayonet Cap Bayonet Cap Lilliput Edison Miniature Edison Cap Screw Screw Screw E27 - Other Name B15s B15d B22d 1* 1 each end No. contacts BA15s BA15d BA22d E5 E10 E14 on base 1 2 2 1* 1* 1* Dia. of Fitting 15mm 15mm 22mm 10mm 10mm 14mm 27mm Various Typical Car bulbs, Car bulbs, Mains light Panel lighting, ‘Pea’ bulbs - Torch Some mains Mains bulbs, Optics e.g. Applications 12V Optics e.g. 12V Optics e.g. bulbs, Infra red MFA boards bulbs, Worcester bulbs Spectral lamps, Ray boxes, Ray boxes, Ripple Ray boxes, Ripple circuit boards, BES Infra red lamps Whitley Bay Notes lamps kits, Locktronics smoke cell etc. tanks etc. tanks etc. *On Edison Screw bulbs, the screw thread forms the second contact. GLS on lamps refers to ‘General Lighting Service’ 280 …inspiring tomorrow’s scientists through practical science.

Bulbs ELECTRICITY & ELECTRONICS ES Bulbs LED Filament Mains Voltage Lamp Daylight Bulbs LED filament bulbs use a string of fine A range of 230V ‘daylight’ GLS bulbs which simulate LEDs to more closely mimic the operation natural daylight, offering enhanced colour rendition of a classical incandescent filament bulb, and improved contrast for inspection, industrial while retaining the low power and cool lighting and other visually demanding applications. operation advantage of LEDs. NEW EL160810 Fitting Power ✓ ✗ £2.93 ea Colour Fitting Power Equivalent EL160815 ✗ £3.80 ea Warm White power ES 60 W OP180750 ES 5 W 30 W ✓✗ £7.44 ea ES 100 W Halogen Energy Saving GLS Bulbs SBC Bulbs Energy efficient replacements for incandescent GLS Bulbs, SBC Cap, Radial Filament mains voltage bulbs. These use 30€% less energy, have twice the expected lifetime and are identical 12 V bulbs, with SBC fitting, and radial (horizontal) filaments. Can be used in in size to the Tungsten filament (incandescent) a ray box if the bulb holder is rotated such that the filament is parallel to the equivalents which are no longer available. They are beams, effectively making it a point source. also fully dimmable. Voltage:€230€V€AC EL130525 Fitting Power Equivalent ✓✗ £3.31 ea Dimensions Power EL130530 power ✗ £3.31 ea EL130535 ES (E27) 28 W 40 W ✗ £3.31 ea 35 x 19 mm (L x Dia.) 5W ES (E27) 42 W 60 W 55 x 38 mm (L x Dia.) 36 W ES (E27) 70 W 100 W 55 x 38 mm (L x Dia.) 24 W 55 x 38 mm (L x Dia.) 48 W Mains Bulbs, Energy Saving EL06676 47 x 25 mm (L x Dia.) 21 W ✗ £1.60 ea EL06678 ✗ £2.90 ea Spiral-type, 230/240V mains voltage low energy light EL06677 ✓ ✗ £2.63 ea bulbs. These are not suitable for dimming or electronic EL06679 ✗ £3.10 ea switches. Bulbs use 5 times less energy than traditional EL160910 ✗ £1.39 ea bulbs and are expected to last 8000 hours, based on 3 hours per day burn time. Colour: Warm white. MES Bulbs Bulbs, MES Cap Torch bulbs. EL120515 Fitting Power Equivalent ✗ £4.06 ea EL06645 Current Voltage Quantity ✗ £6.81 pk EL120525 power ✗ £4.19 ea EL06650 ✗ £2.46 pk EL120535 ES (E27) 11 W 60 W ✗ £4.88 ea EL120800 250 mA 1.25 V 10 ✗ £5.14 ea EL120545 ES (E27) 15 W 75 W ✓✗ £5.75 ea EL06646 200 mA 2.5 V 10 ✗ £2.46 pk ES (E27) 20 W 100 W EL06655 90 mA 1.5 V 5 ✗ £2.38 pk ES (E27) 30 W 150 W EL120505 300 mA 1.5 V 10 ✗ £7.93 pk EL06661 300 mA 3.5 V 10 ✗ £2.91 pk LED mains voltage lamps EL06662 300 mA 4.5 V 10 ✗ £2.55 pk EL180900 60 mA 6.0 V 10 ✓✗ £1.75 pk Low energy mains light bulbs with instant on/off full EL06663 300 mA 6.5 V 10 ✗ £2.63 pk brightness LED technology. Low power consumption, EL160920 0.1 A 12 V 10 ✓✗ £0.19 ea long lasting, cool running and no mercury content, EL066645 200 mA 12.0 V 10 ✗ £2.17 pk as found in the fluorescent type of low energy bulb. EL160850 100 mA 12 V 1 ✓✗ £2.29 pk Non-dimmable. EL160852 250 mA 2.2 V 10 ✗ £2.61 pk 220 mA 1.2 V 10 300 mA 2.4 V 10 Colour Fitting Power Equivalent Bulbs, MES Cap, Lens Ended power EL160580 Warm White ES 5W 30 W ✗ £5.29 ea Lens ended bulbs, with MES bases, producing EL160585 Warm White ES 10 W £7.30 ea a focused beam of light. Commonly used in 60 W ✓✗ torches and applications where a directed beam is required. Dimensions: Diameter 9.5 mm (max.) x length 24 mm (overall). Current Voltage Quantity NON All bulbs are non returnable EL066645 250 mA 2.2 V 10 ✗ £2.17 pk RETURNABLE EL160850 220 mA ✓ ✗ £2.29 pk EL160852 300 mA 1.2 V 10 ✗ £2.61 pk 2.4 V 10 Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 281

ELECTRICITY & ELECTRONICS Bulbs LES Bulbs G6.35 Bulbs Bulb, LES Cap Projector Bulbs LES (Lilliput Edison Screw) cap bulbs. Uses include Bulb for projector lamps (A1/ 223). lighting panels, MFA boards etc. EL120500 Current Voltage Quantity ✗ £7.26 pk 60 mA 6V 10 Festoon Bulbs Festoon Bulbs AU50225 Power Voltage ✗ £7.00 ea 250 W 24 V ✗ £12.44 ea ✗ £12.44 ea EL06643 Diameter Power Voltage ✓ ✗ £1.53 ea Infrared Bulbs EL06644 ✗ £1.41 ea 10 mm 10 W 12 V ✗ £1.19 ea Bulbs, Infra Red 10 mm 3W 12 V ✓ ✗ £1.23 ea A tungsten filament bulb, internally silvered. G4 Bulbs Halogen Lamps, Low Voltage Low voltage halogen lamps, suitable for use in appropriate ray boxes. Distance between pins: 4mm. OP130505 Power Voltage LA09964 Fitting Power Voltage OP130510 LA09965 10 W 12 V BC 250 W 240 V 20 W 12 V ES (E27) 250 W 240 V LED MAINS LIGHT BULBS – WATTS, LUMENS & COLOUR TEMPERATURE • LED bulbs consume far less energy than traditional incandescent (tungsten filament) or halogen bulbs and, unlike fluorescent and compact fluorescent bulbs and tubes, they do not contain any mercury. Also, they do not take time to warm up to full brightness but glow at full brightness almost as soon as they are switched on • Traditionally the brightness of light bulbs is rated by power (in Watts). However, since the introduction of LED mains lighting, the brightness of bulbs is starting to be rated in lumens - the higher the number of lumens, the brighter the light. This is because LED bulbs use so much less power and it is difficult to know how bright the bulbs are without stating an equivalent rating in Watts, for comparison with the old-type incandescent bulbs. The actual power rating should still also be stated (in Watts) • Please be aware that LED bulbs can only be used with dimmer switches if they are of the dimmable type, and dimmable LED bulbs require a trailing edge dimmer switch Equivalent brightness of different bulb types (approximate only) Tungsten filament (incandescent) 25W 30W 40W 60W 75W 100W Halogen 18W 21W 28W 42W 53W 70W Compact Fluorescent (CFL or low energy) 5W 6W 8W 12W 15W 20W LED 4W 5W 6W 10W 13W 18W Brightness (Lumens) ≥220 ≥300 ≥400 ≥700 ≥900 ≥1300 As a rough guide: halogen bulbs use approx. 30% less energy than incandescent bulbs; Compact fluorescent bulbs use approx. 80% less energy than incandescent bulbs; LED bulbs use approx. 85% less energy than incandescent bulbs. Colour Temperature Colour temperature is used to describe the type of white light emitted. Incandescent bulbs generally emit a ‘warm-white’ light, (yellow-white) and are suitable for less harsh (‘cosy’) house lighting etc. Halogen bulbs tend to emit a cooler white light. Fluorescent lights vary, being internally coated to emit different types of light e.g. warm-white, cool-white or light which is biased towards different parts of the light spectrum (e.g. blue or red, for plant growth etc.). LED bulbs use a colour temperature rating to indicate the type of white light emitted, which is stated in degrees Kelvin (K). LED Colour temperature 1800K 2700–3000K 3000K - 4000K 4000K 5000K – 6500K White light type Candlelight Warm White Cool White Cool White Daylight White Moonlight Daylight (bright to Equivalent light source Candle Incandescent lamp Halogen lamp overcast) Warmest Coldest 282 …inspiring tomorrow’s scientists through practical science.

Crocodile Clips ● Components ELECTRICITY & ELECTRONICS Crocodile Clips Crocodile Clips, Insulated Nickel plated steel.Takes a 4 mm plug. 10 A max current. Nickel plated steel with a PVC shroud to prevent accidental short circuits. Connection is via permanently attached wire of maximum 1 mm thickness. Sold in packs of 10. ••• Current rating 5 A max Jaw opens up to 7 mm 43 mm length A EL06565 Quantity £1.23 pk EL18502 Colour B EL06566 £12.73 pk EL18500 £0.61 pk 10 A Red £0.61 pk 100 B Black Components Bells Feet Rubber Feet Electric Bell, Economy Self-adhesive square black rubber feet for attaching the bottom of equipment. Electric. Plastic case with (70mm) Sold in packs of 100. metal plated gong. • 12.7 mm side at wide point BEST • 6 mm height SELLER NEW EL06633 Diameter Voltage ✓ £8.53 ea EL180100 ✓ £9.94 pk 70 mm 3-6 V AC Electric Bell Buzzers A higher quality, more reliable bell manufactured in the EU. Operates on 5-8 V. Buzzer Single tone output, panel mounting, transistor oscillator DC buzzer. BEST SELLER EL101380 £20.27 ea EL06636 Voltage Quantity ✓ £6.76 pk 6V 5 Boxes ABS Boxes Buzzer, Miniature, Electronic Boxes moulded in high impact ABS for Packs of 10 low cost miniature buzzers. These come complete with flying leads maximum strength which can easily be and are ideal for educational projects and general purpose use. drilled or punched. Lids on the boxes are •••• retained by 4 self-tapping screws. Printed Current: 30 mA x 17 x 15 mm circuit board slots are included in the Dimensions (L x W x H): 23 larger size. Finished in black. Fixing Centres: 27.5 mm Lead Length: 80 mm EL98030 Dimensions Height Quantity ✓ £8.94 pk EL130165 Range Voltage Quantity £11.02 pk EL98032 £14.13 pk EL130170 £11.02 pk 75 x 50 mm 25 mm 5 EL130175 1.2-3 V 1.5 V 10 £11.02 pk 100 x 75 mm 40 mm 5 EL130180 2-4 V 3V 10 £11.02 pk 4-8 V 6V 10 6-12 V 9V 10 Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 283

ELECTRICITY & ELECTRONICS Components Capacitors Cell Holders Capacitors, Ceramic Disc Battery Holders AA Size A range of 4-7 mm diameter ceramic disc Packs of 5. capacitors with 25 mm leads (contacts) and a voltage rating of 50V. Sold in packs of 10. EL130185 Capacitance £0.56 pk BA02030 Type £2.03 pk EL130190 £0.58 pk BA02031 £1.42 pk EL130195 220 pF £0.58 pk BA02032 1 x AA Cell with leads £1.68 pk EL130200 470 pF £0.66 pk BA42032 1 x AA Cell snap terminals £2.14 pk EL130205 10 nF £0.69 pk 2 x AA Cell snap terminals £2.21 pk 47 nF £0.55 pk 2 x AA Cell with leads £3.90 pk 100 nF £0.55 pk £0.61 pk Capacitors, Radial Electrolytic £0.54 pk Battery Holders C Size £0.43 pk A range of radial electrolytic capacitors £0.70 pk Packs of 5. suitable for general purpose use. Supplied in £0.78 pk packs of 10. £0.88 pk £2.41 pk EL130210 Capacitance Voltage £4.95 pk BA02040 Type EL130215 £6.35 pk BA02041 EL110650 1 µF 50 V 1 x C Cell solder tag terminals EL110655 4.7 µF 50 V 2 x C Cell snap terminals EL110660 10 µF 16 V EL110665 22 µF 16 V EL110670 47 µF 16 V EL110675 100 µF 16 V EL110680 220 µF 16 V EL110685 470 µF 16 V EL110690 1000 µF 16 V 2200 µF 16 V 4700 µF 16 V Super Capacitors Battery Holders D Size Packs of 5. These capacitors work like a rechargeable battery. They charge in seconds and can be used to power lamps, motors etc. Clearly demonstrates the principles of rechargeable products. EL81435 Capacitance Voltage £4.50 ea BA02045 Type £3.03 pk EL91422 £6.86 ea BA02046 £4.29 pk 10 F 2.5 V BA02047 1 x D Cell solder tag terminals £5.39 pk 20 F 2.5 V 2 x D Cell snap terminals 4 x D Cell solder tag terminals Capacitors, Radial Electrolytic Battery Snaps Kit PP3 snaps with leads. Pack of 10. A kit containing a total of 93 miniature radial lead electrolytic capacitors. Each value individually £18.83 set packed. A total of 12 different values. Ranging from 1µF to 2220µF. Ideal as a starter kit. BA02049 £1.49 pk EL98012 Battery Holders Tapped Contact Cleaner Holds 4 x D (R20) batteries with outputs at 1.5, 3, 4.5 and 6V. Batteries and Contact Cleaner leads not supplied. Each output has a 4mm socket. A highly effective, fast evaporating cleaning agent/ £9.68 ea degreasing solvent for cleaning audio video heads, switch and relay contacts, potentiometers, printed BA02060 £20.31 ea circuit boards and delicate electronic components. Leaves no residue, is harmless to plastics, paint, Coin Cell Holders rubber etc. and leaves surfaces clean and dry. Supplied as a 200ml aerosol can, with applicator. A range of high quality PCB mounting coin cell holders. Cells are held in position by the positive EL120435 contact and connect with a negative contact in the base of the holder, with 3 mounting pads for Freeze Spray stability. Freeze Spray Useful for quickly reducing the temperature of circuit components for fault finding or reducing the temperature of thermistors to alter the resistance. Type Diameter EL98075 £11.96 ea BA150205 CR2016 / CR2025 / CR2032 20 mm £2.56 ea 284 …inspiring tomorrow’s scientists through practical science.

Components ELECTRICITY & ELECTRONICS DIL sockets Heat Shrinking DIL Sockets Heat Shrink Sleeving 8 pin DIL IC sockets, with dual wipe tin plated Heat shrink tubing in pre-cut lengths, with a shrink ratio of 2:1 when heated to contacts. 100°C or above. Highly flexible, flame-retardant and resistant to acids, alkali, fuel and oil. Ideal for placing over joined wires or components to hide and protect electrical joints and provide insulation. Best shrunk to size using a heat gun although a soldering iron tip can be used (less successfully). Dimensions are before shrinkage. EL130220 Quantity £0.70 pk 10 Diodes Colour Length Diameter Diodes, Signal, 1N4148 Black 1.2 metre 1.6 mm Black 1.2 metre 3.2 mm A general purpose low signal switching diode, this 1N4148 diode has an Black 1.2 metre 4.8 mm operating voltage of 75V and current rating of 150mA max. Black 1.2 metre 9.5 mm Red 1.2 metre 1.6 mm Quantity EL130575 Red 1.2 metre 3.2 mm £0.99 ea 10 EL130580 Red 1.2 metre 4.8 mm £1.11 ea EL130585 Red 1.2 metre 9.5 mm £1.11 ea EL130590 £1.34 ea EL130595 £0.99 ea EL130650 £1.11 ea EL130655 £1.11 ea EL130660 £1.34 ea EL130225 £0.59 pk Diode, Rectifier, 1N4001 Heat Shrink Sleeving Kit DO-41 Plastic case, 1A silicon rectifier diodes. 1A/50V. A heatshrink sleeving kit housed in a plastic case with dividers and lid, and containing a variety of commonly used sizes and colours in pre-cut lengths. Lengths included: 50mm and 70mm. Nominal diameters of 3.2mm, 4.8mm, 9.5mm and 12.7mm. Colours: Black, Blue, Yellow, Red, White. EL98020 Quantity £0.53 pk 10 LDRs EL130665 £19.94 kit Light Dependent Resistor (LDR), NORPS12 Heat Guns Photoconductive cadmium sulphide cell with a spectral Heat Gun 2000 Watt 240 Volt response similar to the human eye. As light falling on the cell increases, so the resistance of the cell decreases. Peak This heat gun has two heat settings and offset nozzles for flexibility. The spectral response: Typ. 550nm. Cell resistance: 9kâ—¦ at setting can easily be changed during operation with one hand. Ideal for 10 lux. 400â—¦ at 1000 lux. Dark resistance: Min. 1Mâ—¦. Sold paint stripping from furniture, de-icing of frozen metal water pipes, soldering, as a pack of 5. melting wax, shrinking heat-shrink tubing etc. Supplied with: 1 x Heat nozzle, 1 x Wide nozzle, 1 x Reducer nozzle 22mm, 1 x Reflector nozzle, 1 x Paint EL98016 £11.16 pk scraper, 1 x Transport / Storage case. Specifications: Miniature Low Cost LDR • Voltage: 230 V AC Photoconductive cadmium sulphide light dependent resistor (LDR) in a • Power: 2 kW miniature epoxy sealed open frame package (4mm dia.). Cell resistance • Heat settings: 350 °C / 500 °C reduces as light falling on the device increases. Typical applications include • Air Settings: 300 L/min. or light control, cameras, toys etc. Sold as a pack of 10. 500 L/min • Peak spectral response: 540nm. • Light resistance: 50-100Kohm • Dark resistance: 20Mohm minimum • Max. voltage: 100V • Power max: 90mW • Working temp. range: -20 to +60° EL150700 £3.20 pk TO150800 £29.00 ea Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 285

ELECTRICITY & ELECTRONICS Components LEDs LEDs, Bi-colour LEDs Two LEDs of different colours, connected in reverse parallel, in a 5 mm High quality 5mm LED indicators with diffused lens. Maximum voltage 3.0 V through-hole package with diffuse plastic. DC. PCB or panel mount. Sold as a pack of 10. The LED can be used as a simple indicator with an intermediate switch to BD change the polarity and select the colour. More advanced applications include using pulse width modulation to quickly reverse the polarity to create a third colour (e.g. green + red = yellow). •• 60° viewing angle 2.5 Vf max. NEW A C E EL06620 Colour Frequency Vf max Vr max £0.84 pk EL180730 Colour ✓ £0.25 ea EL06621 A Red 480€THz 2.5 5 £1.19 pk EL180732 ✓ £0.25 ea EL06622 (625€nm) £1.24 pk EL180734 Red/Green ✓ £0.25 ea EL81364 B Green 531€THz 2.5 5 £4.53 pk Red/Yellow EL81362 (565€nm) £4.34 pk Green/Yellow C Yellow 510€THz 2.5 5 (588€nm) LED, RGB D White 4 5 E Blue 638€THz 4 5 High brightness RGB LEDs in a single 5 mm through-hole package. Each (470€nm) colour can be turned on and off independently. The four legs are the +ve rails for the red, green and blue components, and a common ground. LEDs, Kingbright Using switches, primary and secondary colours can be produced. For more A range of super bright 5 mm LEDs from Kingbright, with transparent lenses, advanced users, the brightness of each colour can be controlled with PWM, low power consumption and high visibility. RoHS compliant. Sold as a pack of using either a timing circuit, or a microcontroller such as an Arduino/Genuino 10. or Raspberry Pi, allowing a full range of colours to be produced. Datasheet: timstar.co/EL170133 • Red 630 nm, 2.5 Vf max • Green 525 nm, 4 Vf max • Blue 465 nm, 4 Vf max • Uniform light output • 50° viewing angle • Water clear lens EL167300 Colour Frequency £3.63 pk EL170133 £2.36 ea EL167302 £1.19 pk EL167304 White 468 THz (640 nm) £5.89 pk LED, Flashing Rainbow Cycle EL167306 Red 571 THz (525 nm) £2.83 pk EL167308 Green 638 THz (470 nm) £1.56 pk 5mm LED indicators. Sold as a pack of 10. Blue 510 THz (588 nm) Yellow LED INFORMATION When using Light Emitting Diodes it is strongly recommended that a EL81366 Vf max Vr max £8.49 pk resistor is placed in series with the LED to limit the current and prevent 6 5 heating up and damage. Suggested resistor values to use are shown below. These values are not critical but for guidance only. Voltage in Resistor Circuit Symbol circuit (V) value (Ohms) LED, Infrared 3 150 A 5 mm through-hole infrared LED. Shows how LEDs can emit light outside the visible spectrum. When illuminated, the LED cannot be seen by the naked 5 270 eye, but can be detected by phototransistors, and can be seen using a mobile phone camera or webcam. Supplied in packs of 5. 9 470 • 940 nm peak spectral wavelength 12 560 Anode (+) Cathode (-) • Water clear lens • 20° viewing angle Cathode (-) Flat Side • Forward voltage (VF) 1.2 V (1.6 V max) This is the shorter Anode (+) • Reverse current (iR) 10 µA max connector. There is also This is the longer connector a flat side on the LED NEW which corresponds to the negative terminal. LED TERMINOLOGY EL180120 ✓ £1.81 pk IF max. Maximum forward current i.e. maximum recommended current LED, UV passing through the LED when connected correctly These 5mm LEDs emit light in the UV VF typ. Typical forward voltage frequency range. VF max. Maximum recommended forward voltage Vf max Vr max VR max. 4.2 5 Maximum recommended reverse voltage – not a problem if connected the right way round! EL81368 £4.20 ea 286 …inspiring tomorrow’s scientists through practical science.

Components ELECTRICITY & ELECTRONICS LEDs continued Motor, Miniature, DC LED Holder A range of miniature, circular DC motors, ideal for models and educational applications (the MM10 version has 2 flat sides). A black plastic holder into which the legs of an LED can be pushed. The resulting contact provides connection via the wires. Sold as a pack of 10. Shaft Dimensions (L x Dia.): MM10: 8.1 x 2.0 mm. MM12: 8.1 x 2.0 mm. MM18: 8.6 x 2.0 mm. MM28: 10.0 x 2.0 mm . For other specifications, see individual entries. RoHS compliant. Sold as a pack of 10. A C BEST SELLER EL81360 £7.69 pk LED Tester BD This handy and versatile LED tester is Type Range Dimensions RPM suitable for testing mono colour LEDs as well as bi-colour and tri-colour LEDs of both EL130255 A MM10 1.4-5.0 V 25 x 20 mm (L x Dia.) 16 000 £5.38 pk anode-cathode-anode (ACA) and cathode- EL130260 B MM12 1.5-3.0 V 25 x 21 mm (L x Dia.) 14 700 £5.73 pk anode-cathode (CAC) types. Incorporates EL130265 £8.73 pk multiple testing holes for comparing colours, EL130270 C MM18 1.5-4.5 V 27 x 24 mm (L x Dia.) 6 600 brightness etc. and a push button test switch D MM28 1.5-6.0 V 30.5 x 24 mm (L x Dia.) 9 600 ✓ £10.80 pk with LED test indicator. Propellers Please note: Current indications are for guidance only. Plastic propellers (impellers), designed to push onto 2mm diameter motor shafts. Requires 9V PP3 type battery (not included). EL110150 Type Diameter £1.10 ea • Multiple testing holes for comparing EL110155 £1.10 ea colours, brightness, etc. 4 blade 57 mm £7.55 pk 5 blade 60 mm • Through-hole & Flux LED testing • Current testing at 2, 5, 10, 20 and 30mA (mono colour LEDs) • ACA and CAC testing for bi-colour & tri-colour LEDs at 20 mA, 50 mA, 70 mA, and 150 mA EL170737 £5.49 ea Loudspeakers Miniature Propeller, 3 Blade Loudspeakers A pack of small, high quality plastic propellers designed to fit onto a 2 mm A selection of larger sized, full frequency range loudspeakers for general shaft. Ideal for use with mini motors purpose use. including the BES mounted motors. Sold as a pack of 10 puller propellers, 10 mm x 25 mm diameter. AB C Diameter Power Optimum Impedance EL170330 Motor Pulleys Small push fit pulley which fits directly onto a 2mm motor shaft. Sold as a pack of 5. frequency response EL130230 A 75 mm 10 W 80 Hz-20 kHz 8 Ω £14.36 ea EL130240 B 126 mm 10 W 70 Hz-14.4 kHz 8 Ω £13.61 ea EL130250 C 205 mm 40 W 35 Hz-15 kHz 8 Ω £24.16 ea Miniature Loudspeaker EL52100 £1.41 pk £13.94 set Suitable for use in portable equipment Drive Belt Set etc. These speakers have paper cones £3.08 pk and ferrite magnets. Solder connection A useful set of 4 flexible drive belts, made tags. Supplied individually boxed in from oil resistant black synthetic rubber, for packs of 5. replacing broken or stretched drive belts. EL98025 Diameter Power Impedance £3.53 pk • 240 mm/38mm dia. 50 mm 0.5 W 8Ω • 390 mm/62mm dia. • 580 mm/92mm dia. Motors • 780 mm/124mm dia. Electric Motors EN170900 With 2mm diameter shaft. Sold as a pack of 5. Clips EL06638 Length Diameter Voltage £3.41 pk Plastic self adhesive spring clips, ideal for mounting EL06639 £6.00 pk electric motors or syringes. 38 mm 20 mm 1.5-3 V Accommodates items 19-25 mm in diameter. Sold as a 45 mm 24 mm 3-6 V pack of 10. EL06642 Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 287

ELECTRICITY & ELECTRONICS Components Motors continued Operational Amplifiers Motor with Gear Box 741 OP Amp A combined motor and clear gearbox unit, especially designed for educational The UA741 is a high performance monolithic compensated operational use. The motor operates between 1.5 and 6V DC and the unit includes amplifier IC, constructed on a single silicon chip. It is designed for use in a interchangeable gears, giving a range of speeds and motor torques. The clear wide range of analogue applications. DIL 8 package format (i.e. 8 pins in two polycarbonate housing provides mounting for both the motor and gears, and rows of 4). Sold as a pack 10. full instructions for calculating gear ratios etc. are included. Shaft Dimensions (Dia. x L): 4 x 24mm (front), 54mm long (rear). RoHS compliant. Spare gear kits are also available separately. EL130275 £11.56 ea EL130155 £2.74 pk SPARES & ACCESSORIES £4.69 ea EL130280 Spare gear kit for above Motor Gearbox, Economy LM358 OP Amp A slow speed axle drive gearbox designed for use with MM18 or MM28 type These low power operational amplifier circuits consist of two independent, high motors. Provides increased torque and slows motor speed by approximately gain, internally frequency compensated which were designed specifically to 42:1. Includes a 4mm dia. output shaft and motor mounting screws. RoHS operate from a single power supply over a wide range of voltages. Application compliant. Motor not included. areas include transducer amplifiers, DC gain blocks and all the conventional op-amp circuits which now can be more easily implemented in single power supply systems. DIL 8 package format (i.e. 8 pins in two rows of 4). Sold as a pack of 10. EL130285 £3.58 ea EL130160 £2.68 pk Motor Gearbox, Standard Photodiodes Ideal for projects, providing high power and low speed and designed to fit Mini Ambient Light Sensor our MM28 type motors. The Perspex base incorporates holes for screw fixing if required. The assembly also includes a precision worm and gearwheel, and a This RoHS compliant Ambient Light Sensor, in a 5F lamp package, offers an 150mm long x 4mm dia. output shaft. RoHS compliant. Motor not included. alternative to the standard LDR. This photo IC consists of a photodiode and a current amplification IC. It provides a cost effective way of controlling display backlighting in mobile and computing devices, as well as dark/light control for residential and commercial lighting. Unlike traditional Light Dependent Resistors (LDRs) this device uses no cadmium material and is fully RoHS compliant. Sold as a pack of 10. • Close to the human eye’s response • Good output linearity across wide illumination range • Low sensitivity variation across various light sources • Temperature performance -30 °C to 85 °C • Wide supply voltage range, 1.8 V to 5.5 V • Output Photocurrent (IPH) 0 to 5 mA • Output Voltage (Vout) 0 to 0.8 V • Package Size: 2.0 x 1.25 x0.8 mm EL130290 £2.91 ea EL160200 £7.60 pk 288 …inspiring tomorrow’s scientists through practical science.

Components ELECTRICITY & ELECTRONICS Potentiometers Prototyping Boards Wirewound Potentiometers, 5W Prototyping Board High quality wire-wound controls, ideal for loudspeaker volume controls, This Prototyping Board, also known as ‘Breadboard’, is ideal for making up miniature motor speed controllers, etc. Power rating: 5W; Resistance tolerance: electronic circuits or test circuits without the need for soldering, as wires and ±20%; Spindle rotation: 300° ±5°; Max. operating voltage: 120V; Breakdown components can be simply pushed in or pulled out again. This makes it ideal voltage: 200V. Body Dimensions (Dia. x D): 24 x 11mm. Spindle Dimensions for designing circuits or when components need to be changed, and allows (L x Dia.): 6.5 x 6mm. components to be used many times over. Components and wires are held in place by clips below the holes, the clips being interconnected in groups to create connections between components. Made from white high durability Acetal board mounted on an adhesive foam base, the contact positions are clearly indicated by screen printed alphanumeric grids and colour coded polarity indicators. The boards are also interlocking, enabling two or more boards to be fixed together. There are a total of 400 tie points (contacts). RoHS compliant. Dimensions (L x W x H).: 80 x 54 x 10mm. EL130560 Resistance £3.13 ea EL130675 £7.19 ea EL130565 50 Ω £3.13 ea EL130570 100 Ω £3.13 ea 200 Ω Potentiometer, Linear, 0.25W Prototyping Board Jumper Wire Pack A range of compact carbon track rotary controls. This Jumper Wire pack is suitable for use with all Prototype Boards The insulated all plastic body housing is semi-sealed (Breadboards) and provides a selection of ready cut leads ideally suited for this against dust and moisture. Panel mounting with purpose. The pack includes 10 pieces each of 14 different lengths, 2.5mm to threaded bush and fixing hardware. PCB terminals. 125mm (total 140pcs). Leads are PVC insulated, colour coded in a variety of Sold in packs of 5. different colours, and pre-formed ready for use and come in a handy Perspex, • Spindle rotation: 300° partitioned case. RoHS compliant. • Maximum Voltage: 500 V • Rating at 40 °C: 0.25 W • Temperature range: -25 °C to +70 °C • Mounting bush: M10 x 0.75 • Body Dimensions (Dia. x D): 16 x 8 mm • Spindle Dimensions (L x Dia.): 38 x 6 mm EL130680 £6.91 set EL98065 Resistance £4.69 pk Flexible Jumper Wires EL98066 1 kΩ £4.69 pk EL98067 10 kΩ £4.69 pk Flexible jumper wires with crimped plastic pin housing, ideal for prototyping EL98068 100 kΩ £4.69 pk and solderless applications. Supplied in a pack of 10 assorted colours. EL130901 1 MΩ £4.69 pk 470 Ω • Length 150 mm • Pin size 0.6 mm • Housing width 2.5 mm • 26 AWG insulated wire Knobs For Potentiometers Type A range of soft-touch knobs which push-fit onto standard 6 mm diameter Male-to-Male splined shafts. Black body with integral coloured pointer lines. Suitable for a Male-to-Female range of rotary potentiometers. Sold in packs of 10. Female-to-Female EL170600 £3.13 pk EL170602 £2.49 pk EL170604 £2.49 pk £3.31 pk Strip Board £8.63 pk Colour Strip Board White Fully pierced stripboard used for Red prototype and development work. Can Green be readily cut to size. Provides a simple Blue form of printed circuit. Copper strips Yellow form the interconnections and can easily be cut where required. Made from copper-clad laminated board. All boards are punched on a 2.5 mm pitch. Sold in packs of 10. EL155100 £3.73 pk EL91552 Dimensions EL155102 £3.73 pk EL91554 EL155104 £3.73 pk 25 x 64 mm EL155106 £3.73 pk 64 x 95 mm EL155108 £3.73 pk Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 289

ELECTRICITY & ELECTRONICS Components Resistors Resistors, Carbon Film Kit Resistors, Carbon Film A kit containing a total of 1000 0.25W 5% carbon film resistors. Values ranging from 4.7â—¦ through to 10Mâ—¦. A total of 63 different values, this makes 0.25 W Carbon film resistors, 5 % tolerance, maximum operating voltage an ideal starter kit. 300 V. Resistor Body Dimensions (L x W): 6.5 x 2.3 mm. Lead Dimensions (Dia.): 0.6 mm. Dimensions (L): 66.5 mm. Sold in packs of 100. EL98010 £21.04 kit RESISTOR COLOUR CODES EL130904 Resistance £1.26 pk OHM’S LAW: V=IR so R=V/I & I=V/R EL110695 1Ω £1.26 pk Total resistance EL130910 2.2 Ω £1.26 pk Resistors in series: EL110700 3.3 Ω £1.26 pk Rtotal = R1 + R2 + R3 EL130915 4.7 Ω £1.26 pk Resistors in parallel: EL130925 5.6 Ω £1.26 pk 1/Rtotal = 1/R1 + 1/R2 + 1/R3 EL130920 6.8 Ω £1.26 pk EL110705 8.2 Ω £1.26 pk EL110710 10 Ω £1.26 pk EL130930 22 Ω £1.26 pk EL110715 33 Ω £1.26 pk EL130935 47 Ω £1.26 pk EL130940 56 Ω £1.26 pk EL130945 68 Ω £1.26 pk EL110720 82 Ω £1.26 pk EL110725 100 Ω £1.26 pk EL110730 150 Ω £1.26 pk EL130950 220 Ω £1.26 pk EL110735 330 Ω £1.26 pk EL130955 470 Ω £1.26 pk EL130960 560 Ω £1.26 pk EL130965 680 Ω £1.26 pk EL110740 820 Ω £1.26 pk EL110745 1 kΩ £1.26 pk EL110750 1.2 kΩ £1.26 pk EL130970 2.2 kΩ £1.26 pk EL110755 3.3 kΩ £1.26 pk EL130975 4.7 kΩ £1.26 pk EL130985 5.6 kΩ £1.26 pk EL110760 8.2 kΩ £1.26 pk EL160150 10 kΩ £1.26 pk EL110765 15 kΩ £1.26 pk EL130990 22 kΩ £1.26 pk EL110770 33 kΩ £1.26 pk EL130995 47 kΩ £1.26 pk EL130750 56 kΩ £1.26 pk EL130755 68 kΩ £1.26 pk EL110775 82 kΩ £1.26 pk EL110780 100 kΩ £1.26 pk EL130760 220 kΩ £1.45 pk EL110785 330 kΩ £1.26 pk EL130765 470 kΩ £1.26 pk EL130770 560 kΩ £1.26 pk EL110790 680 kΩ £1.26 pk EL130795 1 MΩ £1.45 pk EL120410 5.6 MΩ £1.45 pk 10 MΩ 290 …inspiring tomorrow’s scientists through practical science.

Components ELECTRICITY & ELECTRONICS Resistors continued Metal Film Resistors, 2W, 5% Metal Film Resistors, 0.6W, 1% A range of 2 W, 5 % tolerance industry standard high power metal film resistors, coated with a red non-flammable lacquer which provides electrical, A range of 0.6 W, 1 % tolerance miniature metal film resistors in an axial climate and mechanical protection. leaded body. Sold in packs of 10. Low noise and voltage coefficient; Low temperature coefficient; Nichrome • Power rating @ 70 °C: 2 W resistor element provides stable performance; Multiple epoxy coating on • Tolerance: ±5 % vacuum deposited metal film provides superior moisture protection. In packs • Voltage rating: 550 V (DC or RMS) o••••f 100. • Operating temperature: –55 °C to +155 °C Power rating: 0.6 W 250 V • Dimensions: 12 mm length max., 3.9 mm diameter max. Working voltage max.: V Overload voltage: 500 Tolerance: 1 % EL161200 Resistance £3.18 pk EL161201 Resistance £1.19 pk EL161202 10 Ω £3.18 pk EL161203 1Ω £1.19 pk EL161204 12 Ω £3.18 pk EL161205 2.2 Ω £1.19 pk EL161206 15 Ω £3.18 pk EL161207 3.3 Ω £1.19 pk EL161208 20 Ω £3.18 pk EL161209 4.7 Ω £1.19 pk EL161210 22 Ω £3.18 pk EL161211 10 Ω £1.19 pk EL161212 30 Ω £3.18 pk EL161213 15 Ω £1.19 pk EL161214 39 Ω £3.18 pk EL161215 22 Ω £1.19 pk EL161216 47 Ω £3.18 pk EL161217 33 Ω £1.19 pk EL161218 56 Ω £3.18 pk EL161219 47 Ω £1.19 pk EL161220 68 Ω £3.18 pk EL161221 68 Ω £1.19 pk EL161222 100 Ω £3.18 pk EL161223 100 Ω £1.19 pk EL161224 120 Ω £3.18 pk EL161225 330 Ω £1.19 pk EL161226 150 Ω £3.18 pk EL161227 470 Ω £1.19 pk EL161228 200 Ω £3.18 pk EL161229 1.0 kΩ £1.19 pk EL161230 220 Ω £3.18 pk EL161231 2.2 kΩ £1.19 pk EL161232 300 Ω £3.18 pk EL161233 3.3 kΩ £1.19 pk EL161234 330 Ω £3.18 pk EL161235 4.7 kΩ £1.19 pk EL161236 390 Ω £3.18 pk EL161237 6.8 kΩ £1.19 pk EL161238 470 Ω £3.18 pk EL161239 10 kΩ £1.19 pk EL161240 560 Ω £3.18 pk EL161241 15 kΩ £1.19 pk EL161242 680 Ω £3.18 pk EL161243 22 kΩ £1.19 pk EL161244 820 Ω £3.18 pk EL161245 33 kΩ £1.19 pk EL161246 1 kΩ £3.18 pk EL161247 47 kΩ £1.19 pk EL161248 2 kΩ £3.18 pk EL161249 68 kΩ £1.19 pk EL161250 2.2 kΩ £3.18 pk EL161251 100 kΩ £1.19 pk EL161252 3 kΩ £3.18 pk EL161253 220 kΩ £1.19 pk EL161254 3.3 kΩ £3.18 pk EL161255 330 kΩ £1.19 pk EL161256 4.7 kΩ £3.18 pk EL161257 470 kΩ £1.19 pk EL161258 5.6 kΩ £3.18 pk EL161259 680 kΩ £1.19 pk EL161260 6.8 kΩ £3.18 pk 1 MΩ EL161262 8.2 kΩ £3.18 pk EL161264 10 kΩ £3.18 pk Wire wound resistors, 6W, 5% EL161266 15 kΩ £3.18 pk EL161268 20 kΩ £3.18 pk A range of 6 W, 5 % tolerance wire-wound power resistors which have flame EL161270 22 kΩ £3.18 pk retardant coating, along with ceramic cores and metal alloy resistance wire, EL161272 30 kΩ £3.18 pk offering high resistance stability, excellent heat dissipation and low noise. Sold EL161274 33 kΩ £3.18 pk in packs of 10. EL161276 47 kΩ £3.18 pk EL161278 56 kΩ £3.18 pk • Power rating: 6 W EL161280 68 kΩ £3.18 pk • Resistance tolerance: ±5 % EL161282 82 kΩ £3.18 pk • Max. working voltage: 350 V EL161284 100 kΩ £3.18 pk • Temperature range: –55 °C to +155 °C EL161286 120 kΩ £3.18 pk • Dimensions: 24 x 8 mm EL161288 200 kΩ £3.18 pk EL161290 220 kΩ £3.18 pk EL162000 Resistance £3.05 pk EL161292 300 kΩ £3.18 pk EL162002 0.1 Ω £3.05 pk EL161294 330 kΩ £3.18 pk EL162004 0.22 Ω £3.05 pk EL161296 470 kΩ £3.18 pk EL162006 4.7 Ω £3.05 pk EL161298 680 kΩ £3.18 pk EL162008 5.6 Ω £3.05 pk 1€MΩ EL162010 6.8 Ω £3.05 pk EL162012 10 Ω £3.05 pk EL162014 15 Ω £3.05 pk EL162016 18 Ω £3.05 pk EL162018 22 Ω £3.05 pk EL162020 33 Ω £3.05 pk EL162022 47 Ω £3.05 pk EL162024 68 Ω £3.05 pk EL162026 100 Ω £3.05 pk EL162028 150 Ω £3.05 pk EL162030 180 Ω £3.05 pk EL162032 220 Ω £3.05 pk EL162034 330 Ω £3.05 pk EL162036 470 Ω £3.05 pk 680 Ω Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 291

ELECTRICITY & ELECTRONICS Components Switches Morse Key Toggle Switch High speed model. Plastic base Complete with on/off plate. with two terminal posts and fine adjustment. A B EL06694 Dimensions £6.71 ea 75 x 50 mm £7.20 ea £4.25 ea Contact Switch Contact make-and-break switch (push to make) with sprung contact, mounted on an insulated base. Type Dimensions Current Voltage EL06543 A Single pole, 25 x 14 x 1.5 A 25 V AC £1.24 ea EL06544 single throw 14 mm (L x W 25 V AC £1.56 ea x D) B Double pole, 28 x 18 x 1.5 A EL120660 double throw 14 mm (L x W x D) Plug Switch Miniature Tumbler Switch Very low resistance one way plug key made from square section brass With removable cover. Maximum 12V 3A. rod with a tapered brass contact with Surface mounting. Single pole, single throw. insulated handle. Mounted on an insulated base with 4mm terminal EL06545 £2.36 ea sockets for electrical connection. Push Button Switch EL120665 Miniature low cost push to make switch with red button. Sold in packs of 10. Switch, Mini Toggle A range of economical mini toggle switches, which are rugged and reliable. Complete with fittings for mounting. Rating: 1 A 250 V AC Contacts: Nickel plated brass. Panel cut-out: 7.0mm. EL06542 Length Diameter Current Voltage £2.26 pk EL130860 Type Dimensions Quantity £8.49 pk 28 mm 10.5 mm 250 mA 125 V AC EL130870 SPDT (on-on) 9.8 x 13 x 8 mm 10 £1.23 ea (H x W x D) SPDT (on-off-on) 9.8 x 13 x 8 mm 1 (H x W x D) Tactile Switch Reed Switch, SPST/SPNO A push-to-make tactile switch ideal for prototyping and PCB mounting. It will General purpose SPST magnetic reed switch, suitable for a wide range of straddle the centerline of most standard breadboards, similar to a DIP or IC. applications. Contact form SPNO. Sold in packs of 5. Four legs make the switch very stable. •••••• Height 4.3 mm V DC Dimensions 6 x 6 mm max Pitch 6.5 x 4.5 mm Contact rating 500 mA 12 Contact resistance 30 mΩ Travel 0.25 mm EL98000 £4.20 pk Reed Switch Bar Magnet For use with Reed Switches. Dimensions (L x W x D): 18 x 3 x 3mm. Sold in packs of 5. EL170010 £0.13 ea EL98002 £3.49 pk 292 …inspiring tomorrow’s scientists through practical science.

Creating Bright Sparks Timstar and Locktronics have been working Electricity Matters workbooks that guarantee together to bring you two workbooks to your students gain a firm understanding simplify the teaching of Electricity. Each of the basic concepts and relationships in workbook is packed full of useful resources Electricity. including: worksheets, quizzes, a teacher’s guide and a student handout. Ensure that your students excel when studying electricity, download your copies today by Expand your range of learning materials and simply keying into your web browser: save time spent on lesson planning with the timstar.co/creatingbrightsparks ADVERTISEMENT

ELECTRICITY & ELECTRONICS Components ● Soldering Thermistors Precision NTC Thermistors NTC Disc Thermistors A range of high accuracy Negative Temperature Coefficient (NTC) thermistors (thermal sensing devices) suitable for general applications. The rigid 12.5 mm A range of NTC (Negative Temperature Coefficient) miniature disc thermistors, leads are ideal for probe assembly and have a tie-bar to aid PCB mounting. for general purpose applications such as temperature measurement and When used in temperature measurements, the thermistor requires no thermal compensation circuits. Also useful in the classroom for demonstrating adjustment between control circuit and sensor, which ensures a temperature how the resistance changes with temperature. A thermistor is a temperature precision of ±0.3 °C. Rated power 10 mW at 25 °C. Suitable for temperature dependant resistor or ‘thermal resistor’. The thermistors are clearly coded. Sold indicators and control instruments. Supplied in packs of 5. in packs of 10. • Highly accurate ±1 % resistance tolerances • Temperature range: -30 °C to +125 °C • Values from 1 k to 100 k • Tolerance: 10 % • Extremely Small B-value Tolerance • Rigid leads Resistance • Fast response 100 Ω • 15 s thermal time constant 300 Ω EL160703 100 kΩ £5.32 pk EL160732 Resistance £7.15 pk EL120415 5 kΩ £4.07 pk EL160733 1 kΩ £7.15 pk EL160730 1 kΩ £2.86 pk EL160734 2 kΩ £7.15 pk EL120420 20 kΩ £4.69 pk EL160735 5 kΩ £7.15 pk EL120425 100 kΩ £4.18 pk EL160736 10 kΩ £7.15 pk EL120430 £4.88 pk EL160738 20 kΩ £7.15 pk EL160730 £2.86 pk 100 kΩ Timers Transistors 555 Timer Transistors An NE555 monolithic timing Integrated A range of more commonly used transistors, for Circuit which is a highly stable controller various electronic circuits. Sold in packs of 10. capable of producing accurate time delays or oscillation. The circuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200mA. DIL 8 package format (i.e. 8 pins in two rows of 4). EL130150 Quantity £4.25 pk EL130880 Type £5.38 pk 10 EL130885 £3.65 pk EL130890 2N3053 medium power Silicon NPN planar £0.58 pk EL130895 transistor £0.48 pk EL130550 BC108 Silicon planar epitaxial NPN transistor £0.48 pk EL130555 BC337-25 npn Silicon transistor £0.51 pk BC547B NPN epitaxial Silicon Transistor BC548B NPN epitaxial Silicon Transistor BC558B NPN epitaxial Silicon Transistor Soldering Soldering Irons Antex XS25 Soldering Iron Antex CS18 Soldering Iron General purpose soldering iron to BS3456 (2.14) featuring the same double Miniature soldering iron to BS3456 (2.14) utilising double shaft construction shaft principle as CS-18. Very low current leakage (1 uA maximum). 230V AC principle. Inner ceramic shaft with outer stainless steel shaft gives near perfect with PVC cable and fitted 13A mains plug to BS1363A. Supplied with 3mm bit. insulation, and reduces current leakage less than 2 uA. Supplied with 2.3 mm Operating tip temperature: 420ºC. bit. 230V AC with PVC cable and fitted 13A mains plug to BS1363A. Operating tip temp: 390°C. TO96510 Size £30.50 ea SPARES & ACCESSORIES £5.26 ea BEST 1.0 mm £5.26 ea Type 2.3 mm £5.26 ea SELLER TO96528 Spare Tips 3.0 mm TO96530 Spare Tips TO96532 Spare Tips Soldering Iron Designed for high speed temperature operation, with round pencil bit. TO96500 Size ✓ £30.50 ea TO16080 Power Voltage £20.43 ea SPARES & ACCESSORIES £5.26 ea 25 W 220/240 V 1.0 mm Type 2.3 mm ✓ £5.26 ea TO96522 Spare Tips 3.0 mm £5.26 ea TO96524 Spare Tips TO96526 Spare Tips …inspiring tomorrow’s scientists through practical science. 294

Soldering ELECTRICITY & ELECTRONICS Soldering Iron Stands Solder Soldering Iron Stand Solder Made from high grade insulation material with Rosin cored, wire form. Dimensions (Dia.): 2.6€mm. chromium plated steel spring. Supplied in 100 g. TO16090 £10.04 ea TO16095 £13.26 ea ST4 Soldering Iron Stand Lead Free Solder, Tube Strong chromium plated steel spring with a A handy sized, more environmentally friendly lead-free alloy solder which heat resistant plastic base. Integral sponge contains a non-corrosive flux. Size: 1mm dia. x 2m long. Contains 99.3% tin for bit cleaning. Suitable for all Antex irons. and 0.7% copper. TO96515 BEST £8.43 ea EL130670 £4.94 ea Soldering Magnifier SELLER Helping Hand Magnifier ✓ A useful aid when soldering, gluing, etc. Desoldering Desolder Tool A high quality tool with double ‘O’ ring washers for increased suction. Teflon nozzle is removeable for cleaning or replacement. Lightweight and easy to use. Dimensions (L x Dia.): 200 x 20mm. TO96492 £3.13 ea EL91558 Type £5.23 ea Tool Fume Extractors Solder Tags Fume Extractor Solder Tags This economical, mains powered solder fume extractor removes solder fumes M3 tin plated brass solder tags. with a high performance fan and replaceable activated carbon filter, which helps to significantly reduce headaches, eye EL91550 Quantity £5.63 pk irritation and nausea. The unit has an adjustable 100 angle for accurate placement. Spare replacement filters are available (see below). • Power consumption: 23W • Voltage: 230V AC • Dimensions (W x H x D): 222 x 270 x 168mm • Weight: 1.4kg • Activated Carbon filter • Mains lead: 1.5m long EL101520 £30.58 ea Magnetic Parts Tray SPARES & ACCESSORIES £8.98 ea EL101522 Replacement activated Carbon filter Manufactured from oil resistant TPR material with a strong 50 mm diameter magnet. Ideal for storing nuts, bolts, screws, washers and sockets during Soldering Iron Cleaners disassembly/assembly. Attaches to any ferrous surface and even works upside- down. Ideal for keeping all parts secure when repairing instruments such as Soldering Iron Tip Cleaner microscopes or power supplies. Retracts flat for easy storage. Contents are made of low abrasive brass NEW shavings which means no water or wet sponges necessary and little temperature drop compared with wet sponges. Anti-slip pad on the base with an integral adjustable soldering iron rest and two concave indents on the top rim. Dimensions (D x H): 82 x 30mm. EL101525 £8.98 ea TO180500 ✓ £8.69 ea Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 295

ELECTRICITY & ELECTRONICS Electrical Measurement Analogue Electrical Meters Analogue Voltmeter, Premium Milliammeters, Analogue This analogue voltmeter, specifically designed for use by students, is a sturdy instrument for measurement of both AC and DC voltage. The instrument comes Moving coil DC milliammeters with zero adjust, with a DC/AC switch and has three voltage ranges. Analogue meters can be fully enclosed in a robust housing, with clear acrylic more useful than digital meters for certain applications, and often provide a front cover. more visually stable reading. NEW • Scale length: 60 mm This instrument is electronically protected against overload but must not be • Accuracy: ±2.5 % connected to voltages exceeding 30 V. • Dimensions: 125 x 80 x 80 mm • AC and DC ranges: 0-3 V; 0-15 V; 0-30 V EL180770 Range ✓ £9.94 ea • Precision: ± 2 % of full scale EL180772 ✓ £12.44 ea • Impedance: 10 kΩ/V 0-100 mA • Electronically protected against overload 0-500 mA • Dimensions: 158 x 108 x 56 mm • Scale length: 72 mm DC Analogue Benchmeters, Dual Scale EL170400 £87.44 ea Economical analogue bench meters designed for education. Large, easy-to- Analogue Ammeter, Premium read scales. Connection via 4 mm terminal posts. This analogue ammeter, specifically designed for use by students, is a sturdy • Accuracy: 2.5 % instrument for measurement of both AC and DC current. The instrument comes • Dimensions: 100 x 133 x 97 mm with a DC/AC switch and has three current ranges. Analogue meters can be more useful than digital for certain applications, and often provide a more NEW visually stable reading. EL180775 Range ✓ £12.44 ea This instrument is electronically protected against overload and will tolerate EL180815 ✓ £12.44 ea overloads up to 15 A for at least 10 seconds. 0-3 V & 0-15 V 0-0.6 A & 0-3 A • AC and DC ranges: 0-0.05 A; 0-0.5 A; 0-5 A • Precision: ±2 % of full scale Bench Meters, Zenith • Impedance: 10 kΩ/V • Max. voltage drop: DC: 0.25 V; AC: 0.27 V Moving coil DC meters, ideal for use in schools, • Electronically protected against overload with rugged construction and mechanical stability. • Dimensions: 158 x 108 x 56 mm Connection is via 4 mm terminal posts. • Scale length: 72 mm • Accuracy: ±4 % EL170410 £108.69 ea • Weight: approx. 200 g • Dimensions (W x D x H): 80 x 100 x 48 mm EL06820 Range £10.08 ea Galvanometer, Premium EL06821 £10.08 ea EL06822 0-1 A £10.08 ea This galvanometer, specifically designed for use by students, is a sturdy but EL06825 0-2 A £10.08 ea sensitive instrument for the measurement of small currents. The instrument EL06826 0-5 A £10.08 ea has a centre-zero scale and three current ranges and is electronically 0-6 V protected against overload, tolerating overloads of up to up to 1 A for at least 0-15 V 10 seconds. Student Dual Amp and Voltmeter • DC ranges: ± 5 mA; ± 500 μA; ±50 μA • Centre-zero scale A strong, student proof meter housed in a high • Precision: ± 5 % of full scale resistance plastic case, incorporating a unique • Internal resistance: ± 5 mA: ca. 9 â—¦; ± switching system which not only operates internal shunting but automatically covers either amps or 500 µA: ca. 90 â—¦; ± 50 µA: ca. 900 â—¦ volts inputs when not in use and therefore eliminates student error. The moving coil mechanism is • Electronically protected against overload adjustable for zero and provides negative reading on • Dimensions: 158 x 108 x 56 mm both ranges. Input is via 4 mm screw terminals. • Scale length: 72 mm • Large 80 x 80mm display reading -5 to 0, 0 to 50, -10 to 0, 0 to 100. EL170450 £111.99 ea • DC amps:-100µA, 100mA, 1A and 5A • DC volts:- 100mV, 1V, 10V, and 50V Microammeters, Analogue • Dimensions (L x W x D): 160 x 110 x 55mm EL06818 £31.03 ea Moving coil DC microammeter with zero adjust, fully enclosed in a robust housing, with clear acrylic front cover. •••• Galvanometer, Moving Coil Range: 0-500 µA Resolution: 10 µA For DC only with 4mm terminals. Scale length: 60 mm Dimensions: 125 x 80 x 80 mm BEST NEW SELLER EL06830 Range ✓ £33.09 ea EL180800 ✓ £12.44 ea 35-0-35 mV 296 …inspiring tomorrow’s scientists through practical science.

Electrical Measurement ELECTRICITY & ELECTRONICS Digital Electrical Meters Demonstration Electrical Meters Digital Meters, IPC Demonstration Meter A high quality range of ergonomically designed digital meters. 8 versions are offered covering most applications and ranges. The units come in moulded A universal demonstration meter which plastic cases and feature 25 mm LCD. Input is via colour coded 4 mm sockets can, by using interchangeable scales and the units are short circuit and overload protected. Powered by a 9 V read both AC and DC volts and amps. PP3 battery (not supplied). Dimensions (L x W x D): 115 x 80 x 45 mm. The movement is a quality, highly sensitive moving-coil meter housed in ABC a tough plastic enclosure, suitable for educational use. The meter is large with D EFG clear scales which can be read from either side of the meter. A complete range of interscales are available separately. • Accuracy +/-2.5% • Basic sensitivity 5mA, 100mV f.s.d • Dimensions (L x W x H): 300 x 150 x 300mm EL52300 £90.13 ea EL81410 Type Range £41.66 ea Interchangeable Scales EL81412 £41.66 ea EL81414 A Digital Voltmeter 0-2 V. DC £53.85 ea A range of scales designed for use with EL52300. Each scale comprises EL81402 B Digital Voltmeter 0-20 V. DC £41.66 ea a plastic panel displaying the scale with graduations on both sides and EL81404 C Digital Voltmeter 0-20 V AC £41.66 ea a moulded box at one end which contains the shunt or voltage multiplier EL81406 D Digital Ammeter 0-200 mA DC £41.66 ea appropriate to the scale. EL81408 E Digital Ammeter 0-2 A. DC £53.85 ea F Digital Ammeter 0-10 A DC G Digital Ammeter 0-10 A. AC £2.05 pk SPARES & ACCESSORIES BA01984 2 x AAA Batteries Digital Meters EL52310 Range £11.86 ea EL52312 £11.86 ea Economic, robust digital meters, EL52314 2.5-0-2.5 mA DC £11.86 ea housed in a sturdy ABS case with a EL52316 10-0-10 mA DC £11.86 ea clear LCD screen. Input is via 4 mm EL52318 0-10 mA DC £11.86 ea sockets on the front panel, which EL52320 0-50 mA DC £11.86 ea features an on/off switch. EL52322 0-100 mA DC £11.86 ea EL52324 0-500 mA DC £11.86 ea Each meters requires a EL52326 0-1A DC £11.86 ea 9 V, PP3 battery (NOT included). EL52327 0-5A DC £11.86 ea Dimensions (W x D x H): 10 x 14 x EL52328 0-1 V DC £11.86 ea 10 cm EL52329 0-5 V DC £11.86 ea EL52331 0-10 V DC £11.86 ea EL101480 Type Range Quantity £23.35 ea EL52332 0-15 V DC £11.86 ea EL101482 £23.35 ea EL52333 5-0-5 V DC £11.86 ea Digital Ammeter 0-19.99 A DC 1 EL52335 10-0-10 V DC £11.86 ea Digital Voltmeter 0-19.99 V DC 1 £2.05 pk EL52337 0-100m V DC £11.86 ea EL52338 0-10 mA AC £11.86 ea SPARES & ACCESSORIES EL52339 0-100 mA AC £11.86 ea BA01984 2 x AAA Batteries EL52343 0-500 mA AC £11.86 ea EL52344 0-1A AC £11.86 ea EL52345 0-10 V AC £11.86 ea 0-15 V AC 0-50 V AC Bench Meters, SATZ Current Direction Indicator Supplied in a strong high grade This current direction indicator has LEDs mounted with opposite polarities. If the ABS case with a large bold LCD and unit is connected to a direct current source, then one of the LEDs will light up 4mm colour coded sockets. Powered and show the direction of the current. If the unit is connected to an alternating by 1 x 9V PP3 Battery (supplied). current source, both LEDs will light up. If the unit is moved back and forth Dimensions (L x W x H): 95 x 90 x the eye can detect that the LEDs light up alternately as the current switches 75mm. back and forth. The current indicator is supplied with two 8 mm diameter red LEDs mounted in a cabinet with 4€mm safety connectors. Maximum voltage 30V. Provided with a 10€mm diameter mounting rod. Rod length: 93mm. Dimensions (W x L x H): 120 x 120 x 27mm. EL18560 Type Range £34.90 ea EL150600 £56.25 ea EL18562 £34.90 ea £29.94 ea School Ammeter 0-10 x 0.01 A DC School Voltmeter 0-20 x 0.01 V DC £2.05 pk SPARES & ACCESSORIES SPARES & ACCESSORIES BA01984 2 x AAA Batteries ST96274 Squat Retort Base Tel: +44(0)3333 442 443 Fax: +44(0)1270 250601 www.timstar.com 297

ELECTRICITY & ELECTRONICS Electrical Measurement Multimeters UT33B Multimeter •P•••alLDTDmeCia-soDsttdaizlebeehaadtoedcldksdstilgiignithcaltlumdeudltimeter. Digital multimeter NEW A neat and compact multimeter with mode select slide switch (DC Voltage/AC Voltage/Resistance) and range select dial. Comes complete with test leads and battery. • Pocket size • Display: 14 x 35 mm • DC Voltage: 2 V ±0.5 %, 20 / 200 / 500 V ±0.8% • AC Voltage: 200 / 500 V ± 1.2% • DC Current: 200 mA ±1.5 % • Resistance: 2 k / 20 k / 200 k / 2 M ±1.0 % • Continuity checking with buzzer • Diode test • Power: 12 V GP23A x 1 • Size: 70 x 120 x 18mm • Weight: Approx.110g (including battery) EL160300 £8.74 ea EL180410 ✓ £14.94 SPARES & ACCESSORIES £1.50 ea SPARES & ACCESSORIES £3.83 ea BA01987 23A (A23) Battery, 12 V BA01970 PP3 Battery Student Digital Multimeter DM830D MY60 Digital Multimeter An easy to use compact 3.5 digit LCD multimeter. Supplied with test leads, The MY60 is a high quality, high-accuracy 3.5 digit multimeter offering battery and boot. Dimensions (L x W x D): 162 x 86 x 33mm. excellent value for money. This meter has thirty two ranges, which cover measurement of AC and DC voltage, AC and DC current and resistance •F•••••eaCDARDDteCoiCCuosnridvevastoeitosmna:lltTutnpsseicsts22eyt20020000mmm0AVVΩtttotooo171205kMA0VΩV, BEST plus test positions for diodes and transistors. It also incorporates an audible continuity tester, large, clear LCD display and a ‘low battery’ indicator which SELLER shows when the battery is exhausted. The meter is supplied with a rubberised holster for protection, which has a 2-height stand built in along with clips to hold the test probes. Designed in accordance with IEC-1010. Supplied complete with holster, test probes, PP3 battery and instruction manual. Weight: 310 g (including battery). Dimensions (D x W x H): 31.5 x 91 x 189 mm. ••••FeaDA3Lta2uCurtrgRoeveaospn:lLotgCawegDseer-: 3.5 digits off 200m/2/20/200V • ±0.5%, 1000V ±0.8% AC voltage: 200mV ±1.2%, • 2/20/200V ±0.8%, 700V ±1.2% DC current: 20µA ±2.0%, 200µA/2m/20mA ±0.8%, 200m/2A • ±1.5%, 10A ±2.0% AC current: 20µ/200m/2A ±1.8%, • 2m/20mA ±1.0%, 10A ±3.0% Resistance: 200/2k/20k/200k/2MΩ ±0.8%, 20MΩ ±1.0%, 200MΩ ±5.0% • Continuity checking with buzzer • Diode check: Test current 1.0mA, test voltage 2.8 ••• Power: PP3 (9V) x 1 LCD hFE: 1 ~ 1000 Display: 30mm x 60mm EL52400 ✓ £14.85 ea EL110250 £18.69 ea £3.83 ea £3.83 ea SPARES & ACCESSORIES £3.80 pk SPARES & ACCESSORIES £3.18 pk BA01970 PP3 Battery BA01970 PP3 Battery EL06687 EL18518 Fuses, Quick-Blow, Gloss Fuses 298 …inspiring tomorrow’s scientists through practical science.