Kit 21 Two Station Intercom
Simple two wire intercom. Each unit with its own speaker, microphone and amplifier (LM386.) Can be modified to a hard wired 'bug'. With 4 strand ribbon cable the power can be sent to the remote 'bug' unit from the receiving unit
Kit 16 FM Telephone Transmitter
ZTX320 transistor specification
Miniature transmitter which attaches in series with one of the two lines to your telephone. Transmits over 200 meters to an ordinary FM receiver. Transmits further if the FM receiver is near the phone line. Tune with ceramic trim cap. Uses the phone line as an aerial and power source
Kit 9 Oscillator Building Blocks
A learning module. Build and experiment with astable, monostable and SR flip-flop multivibrators on the one PCB. 6 LED's & 9V battery-powered. See and understand exactly how each works. Good introduction to electronics. New documentation and PCB 6/2002
Kit 8 Light Alarm
Detects very small amounts of light and sounds the piezo alarm. Put it in your cash box or cupboard. Uses Darlington photo transistor MAL12 and 14011 IC. Educational kit
Kit 7 3V FM Transmitter
The most powerful 'bug' available for its size, 3V supply and number of components. Guaranteed to transmit over 100 meters within buildings and to 500 meters in the open. Easily tunable in the FM band. Greater range at higher voltage and better aerial. For an excellent introduction to the theory of 'simple' 2 stage transmitters download FM Transmitter Theory 1.2MB
Kit 6 Roulette LED
Electronic game. Ten LEDs in a circle. One LED is turned on at a time to simulate the spinning of a roulette ball around the wheel. Uses voltage controlled oscillator circuit. 'Ball' gradually slows down and stops on a number. 'Ball' speed can be adjusted. Uses 9V battery
Kit 5 Stairway to Heaven.
A game of skill to turn on the Stairway of 6 LEDs as the bi- colour LED flashes. Introduces you to several electronics basic circuits with a surprisingly difficult game to play. Box included. Good introduction to electronics. 9V battery
Kit 4 Basic Power Supply Module
Batteries soon become an expensive way to power your electronic kit and electronic games. This is a basic power supply in a box using two 7805 regulators. Input up to 20V AC from a transformer or power pack. Two regulated outputs are available - one fixed at 5V, the other variable. Good introduction to three terminal regulators
Kit 3 LED Dice with Slowdown
A kit to introduce you to electronics and circuit analysis. Seven LEDs arranged like a real dice face. Push the switch and the dice rolls then slows down. Ingenious circuit design used to minimise components. Uses 14017 & 555. Box included. 9V battery operation
Kit 2 LCD Temperature Meter
LCD data sheet - VI302-DP-RC pdf file for Kits 2 and 34.
7106 Data Sheet
7106 Application Notes
Introduces 3 1/2 digit LCD and the very popular 7106 IC. This IC has been used in low-cost multimeters for over 13 years. We use it to measure temperature using a ordinary signal transistor as the sensor. Data sheets are provided as is a breadboard area so you can extend the circuit to build your own voltmeter, ammeter, resistance meter or extended-range temperature meter. Takes away the mystery of how multimeters work. Box provided. 9V battery operation
Kit 63 One Chip AM Radio
Complete AM radio on a PCB. Tuned radio frequency front-end, single chip RF amplifier & detector and two stages of amplification of the audio signal into a speaker. All components supplied. Coil prewound. Excellent for schools. Uses MK484 radio IC
Kit 58 IR Remote Toggle Switch
Waitrony IR Receiver/decoder module General purpose. Not noise protected
pecification sheet for the IR LED
A very useful kit. Everybody has Infra Red transmitters at home - TV remote, video remote, CD remote, etc. Use ANY Infra Red remote to toggle this switch on or off. Relay output rated at 12VDC/10A or 240VAC/5A
Control the speed of any common DC motor rated up to 100V (7A). Operates on 5V to 15V. Uses NE556 to pulse-width modulate a IRF530 MOSFET. In this way motor torque is maintained. Adjustable speed control. Box mounted
October, 2003:. Changed the MOSFET to an IRF530 so 100V motors could be used. But do not draw more than 7A thru the PCB tracks unless you thicken them. Here are the new documents:
