[sdiy] Modified ASR working perfectly!

[cheater cheater]

Interesting. it sounds as though it couldn't sample faster than 500
Hz, so I expect a lot of aliasing, which could sound real nice on high
notes.

How expensive is this thing to make?
How long does it take to solder it up?

D.

On Sat, Feb 13, 2010 at 02:53, David G. Dixon <dixon at interchange.ubc.ca> wrote:
>> >> 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.
>
> Yeah; I was just messin' widja!
>
>> >> 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?
>
> According to the datasheet, there is no lag per se.  The overshoot takes
> about 100ns to settle.
>
>>
>> >  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.
>> >
>> >
>> >
>
>