Timstar - Science

The Powerbase is ideal for use in physics, biology and chemistry experiments in secondary and sixth form schools. It comes with a sturdy, powder-coated steel case with fold flat carry handle making it easily stackable. A very popular power supply that has proven to last the rigours of daily use within schools with its tough construction and tamper proof fixings. •0-15 V AC and 0-20 V smoothed DC at up to 8 A •Combined Continuously variable output •Maximum voltage lock push button reset •Short circuit protection •Tough steel powder coated casing •Heavy-duty screw-in rubber feet •Stackable •Supplied with power lead •Designed and manufactured in the UK •5 Year Warranty

A highly versatile power supply for all low-voltage experiments, with continuous voltage adjustment, separate for DC and AC. The two outputs can be loaded simultaneously without interference. Four digital displays show DC and AC voltage and current. The continuously adjustable DC current limiter can be set using a screwdriver. There is an LED indicator to show when the selected maximum current is reached. The power supply also features electronic overload protection. Specifications DC Output voltage: 0-24 V (stabilised) Ripple and noise (max): 25 mVpp Output current (max): 10 A (0-12 V) Max output current falls linearly to 6 A at 24 V Electronic, continuously adjustable current limiter, adjusted with screwdriver AC Output voltage: 0-24 V (stabilised sine) Output current (max): 6 A Electronic current limiter

The perfect choice for experiments with, for example, electron beam tubes requiring voltages up to 500 V DC at a low current level. The unit also provides two auxiliary outputs: A continuously variable negative voltage (down to -50 V DC), series connected with the 500 V output, and a stepwise selectable AC voltage with galvanic isolation from the DC outputs. Continuous adjustment of the -50 V and 500 V voltages. The current is limited to 50 mA. Voltage and current can be read from separate displays. A switch selects which output to monitor. The AC output delivers up to 3 A and is provided with a thermo fuse. Note: Not recommended for students due to high output current. Specifications Negative DC voltage: 0 to -50 V Current (max): 50 mA Positive DC voltage: 0 to +500 V Current (max): 50 mA Ripple: less than 0.1% Regulation: Better than 1 % for variations in mains voltage and load up to 10 %. AC Voltage: 2 to 7 V (1 V steps) Current (max): 3 A

This power supply delivers stabilised DC voltage, continuously adjustable between 0 and 6 kV. For safety, the current is limited by a built-in series resistance. The short-circuit current is 2 mA max. Under load, the voltmeter shows the actual supplied voltage. The power supply is also capable of delivering 6.3 V (max. 3 A) AC. This is the standard voltage for many electron tubes etc. On the front, you find a yellow/green ground socket, connected to the metal enclosure and hence (through the mains wire) to earth. The high voltage section floats relative to ground, allowing either the black (negative) socket or the red (positive) socket to be connected to ground, resulting in a voltage range of 0 to +6 kV resp. 0 to -6 kV relative to ground. Specifications •DC Voltage: 0 - 6 kV. Stabilised, continuously adjustable •Short-circuit current (max): 2 mA •Ripple and noise (max): 1% (RMS, 100 V - 6 kV) •Read-out precision: 1% + 1 digit •AC Voltage: 6.3 V •Current (max): 3 A

This power supply delivers stabilised DC, continuously adjustable from 0 to 12 V. It also supplies AC, selectable between 2, 4, 6 and 12 V. The AC voltage is not stabilised. Both outputs have overload protection. The DC channel is electronically protected and automatically reconnects while the AC channel has a circuit breaker which must be manually reconnected if it trips. Specifications •DC Output voltage: 0 - 12 V (stabilised) •Ripple and noise (max.): 100 mV •Output current (max.): 3 A •AC Output voltage: 2, 4, 6, 12 V •Output current (max.): 3 A

A simple, robust and reliable power supply, ideal for basic electricity experiments. It offers stepped adjustment of both AC and DC with 1 V between the steps. The DC voltage is not smoothed or stabilised, meaning there is a fluctuation of approx. 10% of the output voltage at step level. The unit is protected against overload with an automatic circuit breaker (the unit works again after about 10 seconds). DC voltage: 1 to 12 in 1 V steps Current: 6 A max AC voltage: 1 to 12 in 1 V steps Current: 6 A max

This has to be the best signal/function generator available for educational use! Developed in conjunction with physics teachers and designed specifically for education, this unit provides all the functionality you need for physics teaching. really useful feature for those less familiar with using signal generators is that for basic use, you just operate two buttons: One for frequency and one for amplitude that's it! There is, of course, far more sophistication for those who require it. If you want to change waveform or to utilise the step and sweep modes, the display keeps you updated on the status of the generator. Unique frequency control: The frequency is set by speed sensitive button. Turn slowly to set the display's last digit, turn faster and the response accelerates designed to work intuitively in practical experiments. Drives speakers, vibration generator etc. directly: The built-in 10 power amplifier effortlessly drives power appliances e.g. vibration generator. The amplifier can deliver more than amp for all frequencies between 0.001 Hz and 100 kHz. Step mode: In many applications you need to study physical system at fundamental frequency and at different multiples of that frequency. The special step feature makes this task incredibly easy. Once the fundamental frequency has been determined (e.g. of spring connected to vibration generator), other harmonics (or overtones) can be demonstrated by simply pressing button, which changes the frequency to progressive multiples of the fundamental frequency. Sweep mode: The generator can sweep through frequency range in order to discover eventual resonances. You decide the frequency range and the speed. You have the choice between linear sweep (fixed number of Hz per unit time) and logarithmic sweep (fixed number of octaves per unit time). Advanced Features: The generator connects to your PC through standard USB cable and acts as USB flash drive. Custom defined waveforms (e.g. created by means of spreadsheet) can be saved to the generator. Sequences of settings can be programmed for automatic execution.

A high-quality simple-to-use student signal generator with a range of applications. Operated with just three buttons: Waveform, Frequency and Amplitude. There is a single output, provided with 4 mm safety sockets. The output can easily drive a speaker or vibrator with ample amplitude for resonance and diffraction experiments. The frequency range extends well beyond the audible range. The lowest frequencies are suitable for ""slow motion AC"" experiments. Unique frequency control The frequency is set with a speed-sensitive button. If you turn slowly, the last digit of the display is set. Turning faster, the response accelerates smoothly. The generator covers the six decades from 0.05 Hz to 50.00 kHz in a single range. The frequency is stable within 0.005 % Three waveforms The generator provides sine, triangle, or square wave signals. Distortion of the sine wave is less than 0.25 % in the audible range (20 Hz - 20 kHz) and remains below 1 % throughout the frequency range (0.05 Hz - 50 kHz). Built-in power amplifier The signal amplitude is continuously adjustable from 0 V to a peak voltage of 7.5 V (15 V p-p; 5.3 V RMS). More than 1 A peak current can be supplied. The output is overload protected. Supplied with 12 V power adapter.

Voltages of 0 to 30 V DC and 0 to 300 V DC at up to 60 mA. Outputs are fully floating to provide negative voltages if required and are taken from pairs of colour-coded 4 mm sockets on the front panel. Each output has a continuously variable voltage control, with electronic current limiting circuitry. An indication of the output voltage is given by a graduated scale on each voltage control. A pair of 4 mm sockets on the front panel provide 6.3 V AC at up to 2 A for filament heating. An illuminated on/off switch is mounted on the rear panel adjacent to a fused appliance inlet. Housed in a robust metal case with a durable powder coated finish. •DC Output Voltage Range No1: 0 to 30 V DC •DC Output Voltage Range No2: 0 to 300 V DC •Maximum DC Output Current: 60 mA (both ranges) •AC Output Voltage: 6.3 V AC •Maximum AC Output Current: 2 A

A low-cost alternative to dry cell batteries. Housed in a robust ABS plastic case, this power supply is ideally suited as a replacement in applications where batteries are normally used. Smoothed and regulated DC is available over those ranges selected by rotary switch. Output is via 4 mm red and black sockets. The DC output voltage available are 1.5, 3, 4.5 and 6 V DC at a maximum current of 1 A.

Continuously variable 0 to 20 V AC and full-wave rectified DC at maximum 6 A continuously or 8 A for short periods. Resettable thermal cut-out. Outputs from two pairs of colour-coded 4 mm sockets. Output voltage is indicated by means of a calibrated scale. An illuminated on/off switch is mounted on the rear panel adjacent to a fused IEC mains inlet. Enclosed in a robust metal case with a durable powder coated finish. •AC Output Voltage Range: 0 to 20 V AC •Maximum AC Output Current: 6 A (8 A short period of time) •DC Output Voltage Range: 0 to 20 V DC •Maximum DC Output Current: 6 A (8 A short period of time)

This unit provides voltages of 2, 4, 6, 9, 12 or 14 V AC or full-wave rectified DC at 4 A continuously, or up to 5 A for periods of 1 hour. Voltages are selected by means of a rotating switch on the front panel. In any incidence of overload, including direct short, a current sensing circuit breaker mounted on the front panel will operate and disconnect the output voltage. Outputs are taken from colour coded 4 mm sockets mounted on the front panel. An illuminated on/off switch is mounted on the rear panel adjacent to a fused appliance inlet. Housed in a robust metal case with a durable powder coated finish. Supplied with mains lead and instructions. •AC Output Voltage Range: 2, 4, 6, 9, 12 and 14 V AC •Maximum AC Output Current: 4 A (5 A up to 1 hour) •DC Output Voltage Range: 2, 4, 6, 9, 12 and 14 V DC •Maximum DC Output Current: 4 A (5 A up to 1 hour)

Continuously variable output from 100 V to 5 kV DC. Output voltage is indicated on a 14 mm 2-digit LED display. The EHT circuits are fully floating so that for certain applications the positive or negative terminal may be safely connected to earth. The EHT outputs are taken from 4 mm shrouded sockets and provide 100 V to 5 kV DC at up to a maximum of 3 mA or current limited to 60 µA. A centre tapped socket is provided to give ±2.5 kV DC output. An additional pair of 4mm shrouded sockets at 19mm spacing are provided giving 6.3 V AC at 2 A for filament supplies. There is also a separate earthing terminal. An illuminated on/off switch is mounted on the rear panel adjacent to a fused IEC mains inlet. Enclosed in a robust metal case with a durable powder coated finish. Supplied with instructions and detachable mains lead. •DC Output Voltage Range: 100 V to 5 kV DC •Maximum DC Output Current: 3 mA •Maximum DC Limited Current: 60 µA •AC Output Voltage: 6.3 V AC •Maximum AC Current: 2 A Accessories •5 kV Lead Red: EL91360 •5 kV Lead Black: EL91362

This signal generator and amplifier provides sine, square or triangular waveforms. Frequency selection is by a switched range and continuously variable fine adjustment control. The frequency is displayed on an LED display. All connections are via pairs of labelled 4 mm sockets with one of each pair connected to earth. An illuminated on/off switch is mounted on the rear panel adjacent to a fused IEC mains inlet. Enclosed in a robust metal case with a durable powder coated finish. Signal Generator Mode: •Waveforms - Sine, Square & Triangular, sinewave distortion 1% on all ranges, square wave rise time 1 µs approx. •Frequency Range - 0.1 Hz to 100 kHz in six ranges, accuracy ±5% on all ranges •Voltage Output - 0 to 10 V (peak to peak), continuously variable across all ranges & waveforms •4 Ω Output - Power output of 4 W over entire frequency & waveforms, will drive loudspeaker or other suitable devices •600Ω Output - Provides attenuation settings: x 1, x 0.1 & x 0.01, all ±5% Amplifier Mode: •Performance - Voltage gain 0 to 100, Input impedance 1 MΩ, Max. input 200 mV (pk to pk), Output spec. same as above •Frequency Response - Frequency response 1 Hz to 100 kHz (-3 dB bandwidth)

Sine and square wave generator. Frequency range 5 Hz to 50 kHz in four switched ranges plus a fine control. Accuracy typically ±10%. The output amplitude is continuously variable from zero to maximum 8 V peak to peak with maximum output power 1 W into 8 ohms. The output is taken from two 4 mm sockets mounted on the front panel. An illuminated on/off switch is mounted on the rear panel adjacent to a fused IEC mains inlet. Enclosed in a robust metal case with a durable powder coated finish.

The Powerbase S8 offers 0 to 12 V at 8 A via a safe relay switching system that provides voltages in 1 V steps. AC and DC voltages are available simultaneously in any combination up to a combined output of 8 A. The output is safely protected by a thermal cut out switch on the front panel with an output limiter which allows the user to preset the maximum voltage available. 0 to 12 V AC/DC in 1 V steps 8 A combined simultaneous output lockable via an Allen key mechanism. • Maximum output 0-12 V DC & 0-12 V AC • Current 8 A • Supplied with Allen key to lock minimum or maximum output • Voltage selector type - Relay switched • Output type - Smooth non-regulated • Push button trip reset • Mains input 230/240 V AC, 50 Hz • Supplied with mains plug and lead + Allen key • Manufactured in the UK

The Powerbase V8 comes with a high-power rotary transformer and a high specification toroid transformer. The unit supplies 0-20 V smoothed DC and 0-16 V AC at 8 A. The output is continuously variable and protected by a panel mounted thermal cut out. An output limiter is fitted which allows the user to preset the maximum voltage available. •A heavy-duty power supply for powering laboratory experiments •Heavy duty variable transformer and high-power toroid transformer •Continuously variable output of 0 to 16 V AC and 0 to 20 V DC, capacitor smoothed •Output current 8 A. Output voltages are rated at 8 A load so higher voltages are available at less output current. •Manufactured in the UK with 5 years warranty •AC and DC outputs may be used simultaneously up to rated current. •Colour coded 4 mm sockets. •Maximum voltage limiter operated by Allen key •Push button cut-out to protect against overload and short circuit conditions •Mains Input 230 V, 50 Hz •Fusing: 5 A mains plug fuse

The Powerbase S5 is a great value power supply that provides a range of AC and DC voltages at 5A. Smoothing is achieved by a 4700uF capacitor. The supply has safe lockable DC and AC outputs ensuring the unit does not exceed the voltage required for experiments carried out by students. • AC & DC Output Voltages DC 3, 7, 10, 13, 17, 20 V - AC 3, 6, 8, 11, 13, 15 V • Current 5A • Supplied with and Allen key to lock minimum or maximum output • Voltage selector type - Stepped • Output type - Smooth non-regulated • Push button trip reset • Mains input 230/240V AC, 50Hz • Supplied with fused mains plug, lead and Allen key • Manufactured in the UK

The Powerbase S10 2-12 V AC/DC switched 5 A power supply unit is ideal for powering electrical experiments using the output voltages ranging from 2, 4, 6, 8, 10, 12 V AC and DC. Safe lockable DC and AC output this ensuring the unit does not exceed the voltage required for experiments carried out by students. • AC & DC Output: 2, 4, 6, 8, 10,12 voltage range in AC and DC • Current 5A • Supplied with Allen key to lock minimum or maximum output • Voltage selector type - Stepped • Output type - Full wave rectified, non-regulated • Push button trip reset • Mains input 230/240 V AC, 50 Hz • Supplied with mains plug and lead + Allen key • Manufactured in the UK

This repair kit for Irwin power supplies allows damaged plastic cases to be replaced quite easily. The kit comprises brand new plastic case in original Irwin blue, gloss black or crystal clear, three ""mushrooms"", which fit on the back of the case and act as cable tidy, new cable clamp and complete fitting instructions. In case of difficulties removing the old cable clamp and cable, specially designed tool to make the job easier is also available.

This Power Supply is suitable for wide variety of appliances which are powered by USB. UK mains plug with standard USB-A socket on top. V 2.1 DC output. • 5 V DC 2.1 (10.5 W) • RoHS compliant • CE marked

Spare Black Terminals for Satz School Power Stations.

This current balance apparatus (BIL coil) consists of a printed circuit board coil mounted on a support handle. The board has 2 coils one with 5 turns and one with 10 turns, rated at 2 A. The apparatus can be used to measure the force on current carrying conductor in magnetic field. permanent magnet should be placed on the pan of digital balance (a yoke with 2 ceramic magnets will work) and the BIL coil mounted in vertical plane between the magnets. When connected to low voltage power supply and ammeter, the balance will be deflected and the new reading can be taken. The force on current carrying conductor and field strength can then be calculated.

This demonstration motor comes ready assembled, with an open construction which clearly shows the design working parts of a simple motor. The motor is mounted on a robust wooden base with acrylic end plates with 4mm sockets and comes complete with ceramic magnets and yoke. Requires 1 -3 Volt DC laboratory power supply (not included). Overall Dimensions (L x W x H): 125 x 75 x 60 mm.

This self assembly motor kit is very robust and clearly demonstrates the constituent parts of DC motor.

Spare magnet for EL81440 Motor Kit.

A model of the simplest form of DC electric motor, having 2-pole armature wound with enamelled copper wire, and permanent magnetic field provided by removable bar magnet. The construction of the model is completely open and all components are readily observable. A disc-type commutator is incorporated and external connection to the phosphorous bronze bushes is by means of a pair of 4 mm sockets. The motor operates on 6-8 V DC.

For demonstration of the force on current carrying wire in magnetic field. 270 x 100 x 160mm (H x W x D)

A comprehensive kit for teaching up to 8 students the various aspects of electromagnetism. Containing: Alloy magnets, ceramic magnets, steel magnets, yokes, plotting compasses, hardboard formers, iron filings, double C-cores, clips, rings and split rings, support bases, armatures, axle rods, split pins, rivets, rubber tubing, formers, reels, cellulose tape, copper wire, pasteboard, postcards, cotton, resistors, bulbs, lampholders, clamps, blocks and full instructions.

Kit of parts to build six model motors as in the 'Westminster' electromagnet kit. The Motor Construction Kit enables pupils to build their own motors from scratch. By having to construct motors in this way pupils gain better understanding of the theory behind electric motors. Contents: • 12 'Magnadur' magnets • 6 armatures • 6 mild steel yokes • 6 support bases • 6 shafts • 24 rivets • 12 split pins • 1 reel 0.6 mm PVC tinned copper wire • 2 reels Sellotape • 300 mm tubing, 2.5 mm bore

Shafts (axels) for Westminster Electromagnetic Kit MA91525.

Rivets for Westminster Electromagnetic Kit MA91525.

Split pins for Westminster Electromagnetic Kit MA91525.

An ultraviolet lamp in high-quality housing with an aperture. The unit connects directly to the mains via an IEC lead, and the housing has an on/off switch, and screw-thread to attached mounting rod. The unit is supplied with UVA emitting lamp. This light is not harmful to skin or eyesight. A UVC lamp (EC180122) is available for photoelectric work. • 11 lamp • 350-400 nm emission spectrum • 370 nm peak

A UVC lamp for lamp holder EC180120, suitable for experiments with the photoelectric effect. This light is harmful, especially to eyesight. It is recommended that bare skin is covered, UV protective goggles worn, and the time the light is switched on reduced to minimum. Specifications: •Power: 5 W •Wavelength: 253.7

These expanded polystyrene balls are used for demonstration experiments with electrical charge. 12 mm diameter.

12 mm x 300 mm.

12 mm x 300 mm.

Nylon friction rods.

This extra-large electroscope is ideal for classroom demonstrations of electrostatic principles such as conduction, induction and coulomb repulsion. light-weight metal vane is used as pointer in the electroscope. The lightweight metal blade deflects when the electroscope plate is charged. transparent scale is provided to measure the angle of the deflection. The front glass window slides up to allow insertion of ionizing material in chamber. This electroscope comes with two accessories: an electrophorus disc and spherical electrode. Dimensions: 248 x 203 x 121 mm.

This pack of electrostatic strips allows students to study charge in different materials for electrostatic experiments. The pack consists of 10 clear polycarbonate strips, which tend to gain positive charge when rubbed with cotton duster and 10 white polystyrene strips, which tend to gain negative charge when rubbed. Suitable for use with our brass wire stirrups.

Pack of 10 brass wire stirrups for use with electrostatic strips.

For charge detection and measurement. Useful for a wide range of experimental applications including charging by induction, Faraday's ice pails, Coulomb's law and capacitance of an isolated sphere. The 3.5 digit liquid crystal display has 13 mm high digits with wide field of view unobscured by trailing leads. The display also provides indication of polarity and low battery. The unit is exceptionally easy to read. Two colour coded 4 mm sockets are located on the sides for maximum convenience and anti-slip feet are fitted to the base. Low operating current gives expected battery life in excess of 500 hours. Housed in a robust, ABS plastic case. Supplied with charge plate, battery and instructions. • Range:0 to 1999 nC • Resolution: 1 nC • Overload: 10 x full scale • Accuracy: ±10% of full scale • Input Resistance: 100 GΩ • Leakage Current: 1pA (10pA max) • Capacitance: 4.7mF

A silk cloth ideal for electrostatic investigations. Dimensions (L x W): 300 x 300 mm.

This Parallel Plate Capacitor demonstrates the working of capacitor; a device which allows the storage of electrical energy in the electric field created between a pair of conductors on which electric charges of equal magnitude, but opposite polarity, have been placed. The apparatus will show the dependence on capacity to the distance between the plates and the nature of the medium between them. Dielectric materials can be placed between the plates for further investigation.

This apparatus allows visualisation of electric fields between various electrode configurations, in a similar way to how iron filings allow visualisation of magnetic fields. It is constructed from transparent acrylic, which allows it to be placed on an overhead projector for class demonstrations but can also be used on white surface for use with visualisers or for direct observation by smaller groups. In order to create electric fields large enough to influence the particles, a high voltage, low current 2-5kV EHT power supply is required. Apparatus includes electrodes, clear acrylic base with 4 mm sockets to clamp electrodes and connect power supply, petri dishes and instructions. Also requires liquid paraffin (PA4452 or PA4454 and semolina (not supplied). Base dimensions (L x W x H): 150 x 150x 65 mm.

A hand driven Van de Graaff generator, which is a very effective unit for introducing electrostatics. The length of the sparks generated is wholly dependent upon the speed at which the user turns the handle but sparks of around 20-30 mm are comfortably achievable. Dimensions (H Dome x Dia.): 400 x 200 mm.

Spare main charge belt for hand driven Van De Graaff, EL101544

Spare hand drive belt for hand driven Van De Graaff, EL101544

A top quality Van de Graaff featuring a motor or hand drive split dome to show how charge is collected in the dome. The generator uses one nylon and one Teflon roller to create double charging effect and sparks up to 10 cm. The 22 cm conductor sphere features a 4 mm socket on the top to accept accessories with a 4 mm plug. For 220/240 V. Dimensions (H x W x D): 560 x 220 x 220 mm. Please note that Discharge Sphere is supplied separately.