Crosstalk for multiple electret mics

[gtzack4]

So I have a basic circuit powering 2 electret mics. This circuit works great to power one mic but when using the power supply on both mics one of the mics has a much nosier output.  I also noticed that if turn up the gain on one mic the other mic gets nosier. I believe this is due to crosstalk.

My though is that I need to add voltage follower (I think that the right name) circuit to reduce the output impedance of each mic. I am pretty new to here and would appreciate ay help I can get.

I am using 2 9v batteries in series to get the grounding them with the ground coming in from the mic pres.
I know that ac voltage is not the right symbol for the electret mic but that’s all I could find.
Both diodes are 12v Zener.

 

[PRR]

Your attachment seems to be broken.

I can't follow your text description without a picture.

What is "noisy"? Hiss? Hum? Buzz?

 

[gtzack4]

I tried to attach the schismatic again. The noise seems to me to be a broad band white noise (more of a hiss).

 

[abbey road d enfer]

I tried to attach the schismatic again. The noise seems to me to be a broad band white noise (more of a hiss).

The Zener diode is  useless, as well as the Schottky.
This circuit is too complex, you can do the same with just one battery, one resistor, one capacitor.
Cross-talk is hardly related to your issue.

 

[gtzack4]

The Zener diode is  useless, as well as the Schottky.
This circuit is too complex, you can do the same with just one battery, one resistor, one capacitor.
Cross-talk is hardly related to your issue.

I will try the simplifiyed circuit  to the  circut below.

 

[gtzack4]

This is the circuit that I is subjected to build with these mics for testing. Ps they provided no data on the mics. There are mics from an Audioscan Verifit 2 (I’m pretty sure that’s the name). They are probe tubes mics used to measure what is happing behind hearing aids.

 

[abbey road d enfer]

This is the circuit that I is subjected to build with these mics for testing. Ps they provided no data on the mics. There are mics from an Audioscan Verifit 2 (I’m pretty sure that’s the name). They are probe tubes mics used to measure what is happing behind hearing aids.

Useless zeners.

 

[gtzack4]

Useless zeners.

I cut out the "useless zeners" and that cleaned up a bit of the noise. There is a little level difference (about 10 dB) from one mic to the next. I am guessing that the Impedance of the caps may be different and difference in mics? 

Thank you guys for your help! 

Off topic.  So I would like to understand how analog circuits work a bit better. I understand how components work and what they do. At Least I’m pretty sure for passive devices, opamps, transistors and transformers.  Is there anything you recommend I read or do?

 

[abbey road d enfer]

There is a little level difference (about 10 dB) from one mic to the next. I am guessing that the Impedance of the caps may be different

Not likely.

and difference in mics? 

More likely; in particular mic capsules are sensitive to soldering heat. Or it could be an error in resistor value, or a 'partially) dead battery.