unless you are putting your microphone through a pre amp into your scope, you won't see such a quiet signal.
i have done this with an iMic (http://www.griffintechnology.com/ products/imic/) and a cheap $2 microphone but you have to use a sound card with a mic input. we also made a sound proof box, out of MDF and mass loaded vinyl.
if have some cinder blocks laying around, put the mic and the board on a concrete floor inside of that brick box and that should make it much quieter, by blocking ambient noise.
Steve On Sep 14, 2007, at 4:15 PM, DJ Delorie wrote:
Take a FFT of the sound.My scope has FFT built in. I just can't get a microphone to pick it up.
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