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Re: Microphone?
I believe your best bet would be to find a pre existing sensor which suits your needs.
If you simply want to measure sound level and don't see it going much over 90decibels then you might want to pillage a Lego NXT sensor which I believe works on a 5v system.
Unless you absolutely need specific sound recognition I would recommend going with a decibel meter rather than a microphone as microphones don't simply measure "loud" but instead send a somewhat complex audio signal.
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