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Voice Operated Switch

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This circuit will give you a clock pulse when the sound picked up by the microphone is loud enough.

 

Parts List:
Component: Value: Datasheet: Qty:
Resistor [R1, R5, R8] 1 K Not Available 03
Resistor [R2]

value depends on type of mic used

Not Available 01
Resistor [R3, R6, R12] 100 K Not Available 03
Resistor [R4] 47 K Not Available 01
Resistor [R9] 3.9 K Not Available 01
Resistor [R10, R11] 8.2 K Not Available 02
Potentiometer [R7] 100 K Not Available 01
Capacitor [C1, C4, C5] 100nF Not Available 03
Capacitor [C2, C3] 33nF Not Available 02
Capacitor [C6] 1uF Not Available 01
Diode [D1] 1N4148 Available 01
IC TL082 or TL072 Not Available 01
IC 4528 or 4538 Available 01
Microphone

electret condenser microphone

Not Available 01