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Subject: Re: Voltage Doubler???

Date: 02/08/02 at 9:44 AM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

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.)

Good luck.

John Dunn - President
Ambertec, Inc.

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