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Re: USB pre-amp with direct monitor for electret microphone
Posted: Sun Sep 11, 2016 6:19 am
by kozikowski
That one is
much better apart from the Zener value which can be chosen. Somebody is paying attention.
I'm going to bed.
- Screen Shot 2016-09-10 at 23.16.26.png (18.06 KiB) Viewed 227 times
Koz
Re: USB pre-amp with direct monitor for electret microphone
Posted: Sun Sep 11, 2016 9:33 am
by 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.
Re: USB pre-amp with direct monitor for electret microphone
Posted: Mon Sep 12, 2016 5:49 pm
by 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