Sound Activated/Clap Switch Using SMD Components
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.
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