--- Steve Rodgers <[EMAIL PROTECTED]>
wrote:
> Hi,
>
> Does anyone have design specifics (especially with
> regard to the high pass
> filter corner frequency, and passband-to-stopband
> attenuation of the high
> pass filter) of the M7716 Micor Squelch chip? Since
> the M7716 chip is no
> longer produced, maybe it would be good to emulate
> it's functionallity using
> a few poles of high pass filter, rectification, and
> a PIC 12F675?
>
> I figure if one could implement the right kind of
> filtering on the squelch
> noise, the PIC 12F675's 10 bit A/D and processor
> ought to make a nice
> implementation of the bi-level squelch.
>
I actually built a "replicant" of the Micor squelch
chip out of a couple of op-amp chips and a lot of
resistors and capacitors. No PIC chip needed. Works
pretty good, I put it in to replace an A/S board that
had been damaged by lightning twice. You can't tell
the difference as far as operation.
Joe
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