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Phantom power for mics

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Author Topic: Phantom power for mics  (Read 1357 times)
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« on: July 10, 2008, 07:17:14 PM »

I have a couple of desk mics that require a significant phantom power source, (45V) and I really don't feel like making a case with 5 9V batteries for each of them.

Does anyone have a circuit for phantom power supply that uses a fairly small transformer? I would like to be able to make this thing power my 2 small mics without breaking the bank or the desk when I set it down

Thanks for your help
WU8V  Kurt
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Posts: 4248

« Reply #1 on: July 10, 2008, 08:27:43 PM »

Hi Kurt,
A lot of mics that use power are rated at 48V max. Many will work on less voltage. My Marshall MXL990 works on voltages as low as 15 volts.

Microphone                                     Mixer
                            47 uF
 HOT (2)  ---------+---------||--------------- HOT (2)
                   +--------+------100 ohm---- +48V feed
                   |        |
                   |       === 100 uF
                  6k8       |
                   |      GROUND (pin 1)
COLD (2)  ---------+---------||--------------- COLD (2)
                            47 uF

GROUND (1) ----------------------------------- GROUND (1)

This is the way I wired one input to my Tascam Board. I just picked up voltage from the power supply.
« Reply #2 on: July 10, 2008, 08:52:20 PM »


The more I look at it, the more I think that I will take the "cheaper" way out and use my Mackie.

Real overkill for a couple of little desk mics, and I was hoping to free it up for other uses, but it's sitting there not doing anything right now so I will just rig up a couple of xlr's and run with it.

Thanks for the schematic to wire it up.

WU8V  Kurt
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