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I just got one of these:

http://www.guitarfetish.com/GFS-35mm-ja ... _6421.html

It's a powered mic to plug into an acoustic/electric guitar preamp, and I've got a couple of questions. How much power and where? My first guess is that it is 9V on the ring, it plugs into one of their preamps that's 9V.
I couldn't find any schematics or specs on the mic or the preamp.

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A man hears what he wants to hear, and disreguards the rest. Paul Simon

Looks like it's powered by the preamp that it's meant to work with (EAP510 in the description), kind of like phantom power on a mixing board. So if the preamp runs on 9V, then it most likely provides 9V to the mic. You shouldn't need to worry about voltages or schematics; just plug it into the right kind of preamp.

I've got these blend preamps that I built, they blend a mic and piezo. I originally bought the components and made the mics as well, but it's really difficult to solder the leads onto the mic element without overheating it, I was only able to get it right about a third of the time. I've been looking for a better solution for an internal mic, and I thought this could be it. It will be pretty simple to provide power to the mic from the preamp circuit, I just need to know what voltage and connection.

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A man hears what he wants to hear, and disreguards the rest. Paul Simon

it says in the description of the link you initially provided that it's an electret condenser microphone. look up schematics for that in google and you'll easily find lots of stuff.

those mics can run on 9V, and you typically just need an extra resistor and a dc-blocking capacitor to hook them up. it looks pretty straight forward.