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
