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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 19th Nov 2008, 9:01 pm   #1
znortaudio
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Default How to send phantom power to an electret mic

Hello everybody! I've recently bought two electret vintage microphones (Grundig GCMS 333), wich come with 6-pin DIN connector and need electric power to work.
My idea is to build a little box with DIN input connectors, XLR (or TRS) output connectors, and supply the voltage trough the phantom power of a mic preamp (48 V). The question is, the mics need a maximum of 20 V, so I have to make a voltage divider too. I've made one, but it doesn't work (!!), so could somebody help me with an specific-for audio purposes voltage divider scheme?
Thanx and cheers from Spain!
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Old 19th Nov 2008, 11:18 pm   #2
Tim
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Default Re: How to send phantom power to an electret mic

Phantoms for mics are supplied via mic transformers. Haven't done anything serious with mics for nearly 20 years, but ISTR it had to do with centre taps and balanced lines.

Explanation here

http://www.soundonsound.com/sos/mar0....htm?print=yes
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Old 20th Nov 2008, 3:26 am   #3
arjoll
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Default Re: How to send phantom power to an electret mic

Phantom power is 48V fed down both hot and cold on a balanced line, so there is no voltage across the mic itself.

Some information on how to power a mic that needs power but is not designed for Phantom power (i.e. 48V) is here.
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Old 21st Nov 2008, 12:19 am   #4
Tim
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Default Re: How to send phantom power to an electret mic

Thanks,that's a handy one Arjoll. Added to my Bookmarks..............
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