Sensor and control circuit diagrams

Mini Touch Alert

Connecting it to the door handle, it constitutes an effective as economic alert for your room, office, lab, or even drawer.

Sound of Light Circuit

The circuit uses a solar cell as the input transducer, blocks the DC produced by the cell, but amplifies the light received by the cell. Sunlight, moonlight, torchlight all produce sound which is amplified by this circuit.

Audio Perimeter Monitor

This circuit is intended for audio surveillance of an unattended area, examples being a back garden or open space. It can be used to listen for wildlife or just as an extra pair of ears.

Room Noise Detector

One LED monitors three levels: 50, 70 & 85 dB Useful to detect too noisy environments

230Vac Lamp Toggle Switch

Compact, transformerless circuitry. No relays employed

Electronic Candle Blow Out

LED or bulb switch off with a puff. Funny gadget - 3V Battery supply.

Infrared Link

This is a battery powered IR Link which may be used in more than one room. The standby current is extremely low - giving a good battery life; and by shutting down in the presence of extraneous IR radiation it copes with the problem of excessive output current.