In my endeavours to utilize 16F84 and 12C508 for my own brand of PBX, I am
finding that almost all similar projects by others use transformers to
couple the audio to the voice paths.

I have tried using capacitors to do this but get lousy audio.  (.1uf or 1uf)

Is there a good "transformerless" method??

Am I using improper value caps ( I was going to try 10uf non-polarized
elec.)

This seems to be the last bit of info I need to get to work on this.  I was
hoping to only use transformers (if necessary) on the CO side of the switch
matrix.

Thank you in advance.

John Mullan
jmullan@cgocable.net