In Reply to: Re: Voltage Doubler??? posted by Russ Kincaid on 02/07/02 at 5:11 PM:
Phantom power is used to provide operating power to microphone preamplifiers via what is called an XLR connector.
Pin 1 is ground while pins 2 and 3 carry differential audio. On top of that digital audio, a +48 VDC source is connected via two matched 6.81K resistors to pins 2 and 3. The said preamplifier derives its DC operating power from the same two pins to which it deilvers push-pull audio output.
Some web sites to look at are at:
(You can ignore the sites devoted to the F4 Phantom jet fighter plane.)
John Dunn - President