This project is a sound-activated switch.
Clap switch/Sound-activated switch designed around op-amp, flip-flop, and popular 555 IC. Switch avoids false triggering by using a 2-clap sound. Clapping sound is received by a microphone, the microphone changes the sound wave to an electrical wave which is further amplified by the op-amp.
555 timer IC acts as a mono-stable multi-vibrator then flip-flop changes the state of the output relay on every two-clap sound. This can be used to turn ON/OFF lights and fans. The circuit activates upon a two-clap sound and stays activated until another sound triggers the circuit.
- 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