USB pre-amp with direct monitor for electret microphone

[kozikowski]

That one is much better apart from the Zener value which can be chosen. Somebody is paying attention.
I'm going to bed.

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Koz

[cyrano]

In stead of a battery box, I use a phantom-to-pip adapter. Here's the schematic:



You could use a 9V zener (D1) to lower the output to less than 10V if you think your mic wouldn't be able to withstand 12V.

The lowest noise is produced with a 5.6V zener.

Higher pip power gives a higher headroom. The output won't be significantly higher, and the noise floor is a tiny bit lower with a higher voltage to the electret.

[kozikowski]

And again, we're designing a Phantom Power adapter. My original design was to a dry (no battery) 1/8" plug, not commercial grade XLR. There was no 48v and no other option.

Koz