Isolation between microphone and amplifier

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zerodegreec

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I have a project that's killing me. I have a microphone that I MUST completely isolate from the amplifier its sending a signal to.

I have a speaker and mic that I cannot separate the Neg (-) of the Mic and Speaker. If I make up a powered circuit to power the FET of the electret mic life is good and everything works. As soon as I connect ANYTHING to the speaker side I have problems with feedback.

So is there any way to isolate both sides of this drawing.
 

If I make up a powered circuit to power the FET of the electret mic life is good and everything works
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Me confused, if every thing works then what is the problem ?
Which MIC you want to connect, Electret or Dynamic ?.
Are you using Pre-Amplifier ?. Or how you are connecting the mic to the amplifier ? Best is, instead of Block Diagram, upload the schematic.
 

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