Clap Switch (Sound Activated Switch) Using CD4013, NE555 Timer, LM358 OP-AMP

Clap Switch (1)

Clap switch/voice activated switch designed around op-amp,flip-flop, and popular 555 IC. switch is free from false triggering to turn on/off any appliance, you just have to clap twice. The sound of clap received by microphone, microphone changes the sound wave in electrical wave which is further amplify by op-amp. 555 timer IC act as mono stable multi vibrator then flip flop changes the state of output relay on every two clap.


* Supply 12V DC 60mA
* On board preset for sensitivity adjust
* On board LED for relay on/off state
* on board condenser Mic
* Relay output rated 12/24V 5A, 230V AC

Clap Switch (2)

Clap Switch, Sound Activated Switch Schematic, PCB layout, BOM

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