]]>gofar992013-01-04T21:12:55-00:00Re: Microphone Interface
https://audioroundtable.com/forum/index.phpindex.php?t=rview&goto=75142&th=18063#msg_75142
That's pretty cool, Bruce. Lots of capacitance in there with good long RC time constants to make the supply smooooth. Gives a good voltage too, just right for standard IEC 61938 phantom power.
On a semi-related note, the little electret condenser microphones so commonly used by DIYers also need power supplied to them, although it isn't quite as high a voltage requirement as used in (any flavor of) IEC 61938. The electret capsules usually need 2-10V. I sometime use AA batteries for electret condenser power, which also provides good noise immunity. This is a little preamp circuit I use, which provides phantom power for the little microphone capsules: