Sound Activated Switch – Relay
- Rajkumar Sharma
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 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.
- 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