Light Detector Circuit

  
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.
Light Detector Circuit - schematic




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