[Coco] Coco Cassette interface help

[S Klammer]

Are there schematics available for the RadioShack X10 controller for the
Coco 1/2?  It was programmable via the cassette port.  Although it could
likely be done much more easily now, it may be of interest.

Shain
On Feb 28, 2017 3:46 PM, "Dave Philipsen" <dave at davebiz.com> wrote:

> A couple of things to keep in mind. The comparator is set up for higher
> level signals as would drive an 8-ohm speaker in a small tape player.  You
> could tweak it to work on lower amplitude signals probably by just fiddling
> with resistor values.  Also, the comparator is basically an op amp. If you
> need an amplifier *and* a comparator you could probably use two of the op
> amps in a quad op amp package.
>
> Dave
>
> > On Feb 28, 2017, at 1:25 PM, RETRO Innovations <go4retro at go4retro.com>
> wrote:
> >
> >> On 2/28/2017 1:05 PM, Dave Philipsen wrote:
> >> All you want to do is amplify the signal that is coming from the CoCo
> cassette out. Use a capacitor to de-couple it from the comparator circuit.
> It won't matter if there's DC bias on the output of the op amp because you
> will effectively remove it with the cap.
> > True, and I will give it a shot, but I'll continue to search for a way
> to make the comparator idea work alone.  Amplifying the source only to get
> it "over the bias" of the comparator just seems wrong to me :-)
> >
> > Still, I already was thinking of your idea, in the context of using an
> LM386 to amp the signal brute force to get it to work.  So, I agree it's a
> workable solution.  Thanks for the suggestion.
> >
> > I am also going to see if I can feed some known signals into the
> comparator to see if I have messed up the design.
> >
> > Jim
> >
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>
>
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