4850cbf8$1@news.povray.org...
>
> The pre-amp is probably expecting a real microphone, not one that needs 
> power.
>
Some top-notch microphones need power :-)
on professionnal equipment 48V DC phantom power through ballanced wiring is 
commonly used.
http://en.wikipedia.org/wiki/Phantom_power
But as I said it does not fit to PC microphones that use plugin power
A detailed arcticle :
http://www.epanorama.net/circuits/microphone_powering.html

Marc

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