[sdiy] Modified ASR working perfectly!

[cheater cheater]

On Fri, Feb 12, 2010 at 22:12, David G. Dixon <dixon at interchange.ubc.ca> wrote:
>> 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

Aliasing as in, nyquist, sampling of signals that have content above
fs/2, and all that stuff. I'm sure you know what that is.

>
>> 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.

Ok, but how fast does it start the swing after the input voltage
passes the specified treshold level?

>  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.
>
>
>