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Thread: DIY phantom power unit

  1. #1
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    DIY phantom power unit

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    I've been looking at building a phantom power supply. Is it as simple as taking a wall wart, chopping the end off, and connecting the + and - leads to the + and - leads of the cable going to the mic?

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    Talking

    Yo Doink:

    If and when you do this chopping and taping, make sure you're not standing in water when you grab the mic.


    Green Hornet

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    Re: DIY phantom power unit

    Originally posted by Doink
    I've been looking at building a phantom power supply. Is it as simple as taking a wall wart, chopping the end off, and connecting the + and - leads to the + and - leads of the cable going to the mic?
    No, it's not that simple.

    First of all, you hafta find a wall wart that'll put out 48 volts of clean DC. then you hafta limit the current output to about 10ma by using a pair of closely matched 6.8k resistors (connected to the 48V DC "+" lead) and feed that (coming from the those 2 resistors) to the two signal leads of the mic (pins 2 and 3). Finally, you'll connect the "-" lead of the supply to ground (pin 1).

    Then, you'll need a couple of 10mfd blocking capacitors in series with pins 2 and 3 (between where you added phantom power and the mixer) to prevent the DC signal from hitting the mic preamp or mixer. Some mixers already have those capacitors in place.

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