Electret Microphone
This revision is from 2018/07/31 10:23.
How to use a electret microphone with a balanced phantom powered input.
We use the Primo EM172, a 12€ high quality electret microphone. The circuit presented here can be use to build a monophonic streambox, or with two of them a binaural head.
The presented circuit power the electret microphone with a bias voltage determined by the value of a zener diode. Usualy 5 volts is enought, by I find out 12v works better with the Primo EM172. It use the +48v from the phantom power, and output a balanced signal, this way an extended length of cable can be used with very little noise.
The circuit is quite simple
Here is where the parts goes.
You can find the eagle files here.
Last changed 2023/03/13 15:35