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DIY Clap On Clap Off Switch

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From instructables user JayantBh:

Clap On Clap off switch works as an automated switch that makes devices On and Off by making merely a clap sound or other similar pitch sound. It is based on 555 timer IC and electric condenser Mic, which is working as a sound sensor. Condenser Mic basically converts sound energy into electrical energy, that in turns used to trigger 555 timer IC, through a Transistor.

Full tutorial

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