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how to use a microphone as switch


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Hi Hussain,
Welcome to our forum. ;D
1) If the microphone is an electret type, then power it through a resistor from a filtered positive voltage.
2) Amplify the microphone signal with a simple opamp amplifier circuit.
3) Rectify and filter the opamp's output then you will have a "1" when there is sound and a "0" when there is no sound.

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