Re: Adapting a microphone to remote phantom power
- From: David Nebenzahl <nobody@xxxxxxxxxxxxxxx>
- Date: Thu, 09 Apr 2009 20:27:08 -0700
On 4/9/2009 4:36 PM David Nebenzahl spake thus:
So I'm thinking I could modify the microphone to accept power from the recorder, without modifying the recorder in any way. There are a few things I don't know, however:
o The voltage of the power supplied by the recorder, which runs on 4 AA cells. (48 volts? I'm guessing not, but who knows?)
Further research reveals that the recorder supplies 2.8 volts on both channels of the microphone input.
o The configuration of the microphone jack. My mike uses a 3-conductor plug, so what happens to the power contact in the jack?
See above; power carried on the inputs.
o The wiring inside the mike and the difficulty of rewiring it (haven't opened it up yet to look).
There's a small circuit board inside (surface-mount, surprisingly complicated for a microphone preamp). Battery power comes in on two separate wires. If battery - goes to ground, then I might be able just to connect battery + to one of the inputs, perhaps with a 1.5 volt zener diode to limit voltage. If not, I'd be afraid of messing it up. Time to look for a schematic?
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