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Subject: Voltage Doubler???

Date: 02/06/02 at 10:55 PM
Posted by: Blair
E-mail: blairleish@davencourt.org
Message Posted:

As a warning, I am new to all of this so I don't always know exactly what I'm talking about. I am doing a DIY professional microphone preamp project and have several questions. We'll start with the "voltage doubler" question. The circuit that I am planning on using requires +15V -15V connections for power. I have been advised to use an external table top power supply to cut down on noise. I have also been advised to use a linear power supply. The microphone input also requires "phantom power" at 48 volts. Here's where I get confused. Where do I derive the 48 volts from? I can't find an external power supply that will provide both 15 V and 48 V. Is it possible to use the 15 V power supply and build some kind of voltage multiplier into the mic pre box? I have heard the term "voltage doubler" used before but am not quite sure how to do this. Also 15V doubled is only 30 volts. Can I triple the voltage and so on and so forth? Is it also possible to keep the 15 volts separate from the 48 volts and use them at the same time? Sorry for the rudimentary questions. If you can help I'd apreciate it. Thanks!

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