Phil Keller wrote:

> The peak detector is what I described, without knowing what it was
> called.  It is sufficient for what I need.  (This is not precision, just
> an indication of relative volume level.)  My problem is before that.  I
> need to be able to translate an audio signal that is referenced to audio
> ground to a signal with its reference to digital ground without
> connecting the grounds together.

Why do you not want to (or why can't you) connect e.g. a PIC's ground to
the analog reference ground? Depending on what you want to achieve, the
ways to do it will be different.

Gerhard
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