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Sound Operated Circuits

Clap Switch
Hand Clap Electronic Control:  turn relay on and off by hand Clap
Mega phone circuit 9v
Sound Operated Switch
Whistle Detector using 8 Pin PIC
Whistle On Whistle Off:  This CMOS toggle flip flop circuit has an addition of2- bandpass filters and condenser microphone so the relay can be toggled by whistling at it.
Whistle Responder:  Beeps when hears your whistle A gadget suitable for key-holders, games etc.
Whistle Switch

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