Clap switch/Sound-activated switch designed around op-amp, flip-flop and popular 555 IC.

Switch avoids false triggering by using 2-clap sound.

Clapping sound is received by a microphone, the microphone changes the sound wave to electrical wave which is further amplified by op-amp.

555 timer IC acts as mono-stable multi-vibrator then flip-flop changes the state of output relay on every two-clap sound.

This can be used to turn ON/OFF lights and fans.

Circuit activates upon two-clap sound and stays activated until another sound triggers the circuit.

Specifications:

·        Supply 12V DC @ 60mA

·        On board preset to set the sensitivity

·        On board LED to indicate the Relay on/off state

·        On board Microphone

·        Relay switch 5Amps, 110V-230V