28 Feb
2017
28 Feb
'17
10:14 a.m.
On 2/28/17 12:56 PM, Chuck Guzis via cctalk wrote:
On 02/28/2017 09:42 AM, Seth Morabito via cctalk
wrote:
Only works for FM and frequency
shift based formats.
Everyone had their own favorite. I used to flip a bit doing biphase in
software
at 2400 baud. Minimal parts to none.
Allison
Synertek used an LM311 (an LM358 would work just
fine) to build a
comparator circuit. I _think_ you could use this exact circuit to
take the analog output from the CoCo and turn it into a 5V sqauare
wave.
I don't know a thing about the CoCo cassette format. I know that back
in the day when things like the KC standard were the rage, a NE567 PLL
was considered the cat's whiskers for data recovery. But again, I don't
know what the CoCo cassette standard looks like Also, you may want to look at the IBM 5150 (PC)
cassette circuit. My
recollection was that it was pretty robust, even if few made use of the
facility.
--Chuck