[sdiy] Modified ASR working perfectly!

[David G. Dixon]

> Think it can be used to process audio?

I don't see why not.  The DG409 is generally used to switch audio signals.

> E.g. connect output 1 while discarding 2,3,4. Scan at several kHz.
> Could create some nice aliasing?

You got me there.  For me, aliasing is something you do when you don't want
other people to know your name.  :-b

> How fast can it scan? (you'd need a stable clock for that..)

I've scanned it up to at least a few kHz, and it seems to work fine.  You
basically just get a copy of the input voltage then.  You can see the little
steps on the scope, but the output CV is effectively smooth.

> What are you using for the clock comparator? How fast is it?

Right now I'm using half of a TL072, which is 13V/us, or about 2us for full
output swing -- plenty fast enough for this application, I think.  The other
opamp on this chip is being used as an input buffer for the incoming signal.

I'm afraid I can't answer all of these questions, because I'm actually
dropping my prototype board in the mail to one of our esteemed module
manufacturers for him to test, as he wishes to license the design from me
for a module.  Hence, I won't actually have the board when I go home
tonight.