I have been planning to build a similar circuit for handling
audio from a radio scanner.  Is the NE570/571 still considered state
of the art enough that new parts are being manufactured?

        Back when I was a service technician with our audio visual
department, we used to see notations beside certain parts indicating
that they were no longer recommended for new designs but were still
available until stocks ran out.
That often means two weeks before you need to replace one.:-)

        The other design I am thinking about would use a PIC like the
12F675 and a digital pot to adjust volume.  This might be much harder
to make work than the analog circuit.


Martin McCormick WB5AGZ  Stillwater, OK
OSU Information Technology Division Network Operations Group

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