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Old 25th February 2007, 06:24 PM   #1
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Default Microphone power supply

Has anyone here built a high quality power supply for a condenser microphone?

I am currently building a converter for my Sennheiser MKH416T microphone, based on this circuit:


As you can see it converts 48v from any phantom supply to 12v to feed the T supply. But I would like to improve on the zener regulator.

Current drain is very low: just 6mA.


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Old 28th February 2007, 04:25 AM   #2
digi01 is offline digi01  China
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I use battery for mine mic,I think this way is more easy.

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Old 28th February 2007, 05:27 AM   #3
imix500 is offline imix500  United States
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We have a bunch of T-power adapters at work for the old 418's and such. I'll take one apart next time I'm there. They're old though, so they might also be zener based.
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Old 28th February 2007, 09:34 PM   #4
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This circuit will work very well - and there is no real reason to try and improve on the zener regulation.

Remember that with a Phantom supply - you have very limited current available, so the use of any sophisticated regulation is difficult. Also the + 48 volt supply will be very quiet so no additional ripple reduction is required.

Of course if you are building a mains powered 'T' power microphone supply - then you can certainly play with the regulation!

John Audio
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