dax2@hotmail.com wrote:

> I need to use a 12F675 to detect an audio signal of about a volt.  Any ideas?

You need to know what you want to detect. The audio signal itself (on a
oscilloscope level, so to speak) is not exactly what you hear (on a
physiological level, so to speak). When detecting an audio signal, you are
usually (in the simplest form) interested in something like an envelope
curve, filtered with a response time of below 20ms.

As Jinx said, search for 'light organ'. Light organs usually have 3 such
envelope detector circuits that respond to different frequency bands. 

Maybe a PIC is not the adequate tool to do the actual detecting. It
probably is better suited to process the detection signal of some simple
hardware circuitry (similar to what you find in a typical light organ).

Gerhard

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