In a message dated 11/18/99 10:18:26 PM Eastern Standard Time,
jmullan@CGOCABLE.NET writes:

> 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
>
I use the Motorola MC34014P Speech circuit.  It works great.

Max