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using a microphone as sensor

I have a couple of headset microphones, and I would like to use them as sound sensors..

I tried to amplify the signal using LM386, but it doens´t work.. can someone help me on this?

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If they are electret microphones then they need the input circuit to supply powr to them.

thanx OddBot!

i googled 'electret microphones' and found this link with some schematics... will try them soon: