48 V preamp plans?

I want to build a preamp to run off the 48V phantom power from the mixing board on an XLR (microphone) connection. Does anyone know of a good circuit that will work with a piezo at this voltage? I'm looking for clean impedance matching not overdriven fuzz.

Also, I want to run lights (probably LEDs) on the same power. If I just wire the LEDs in parallel with the preamp, will it work or will it short something out?

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Permalink Reply by Doc Oakroot on May 15, 2009 at 9:19am
Oh, yeah, I forgot...

I also want to wire a normally open 1/4" jack across the input, to be used only when power is not available. Will that cause any problems in either the powered or unpowered scenario?
Permalink Reply by Doc Oakroot on May 16, 2009 at 1:01am
Barry Savage answered this over at the yahoo group.

What I hadn't thought about is that the phantom power on a mixing board is very low current, so this idea probably won't work. Guess it's back to the battery.

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