Light Detector Circuit
Circuit :  Mick Devine, UK



Notes
Variable resistor R1 adjusts the light threshold at which the circuit triggers. R1's value is chosen to match the photocells resistance at darkness. The circuit uses a CMOS 4001 IC. Gate U1a acts as the trigger, U1b and c form a latch. S1 resets the circuit. The output device may be a low power piezo buzzer.
Circuit Exchange International Return to Switching Circuits http://www.zen22142.zen.co.uk