[sdiy] Digital VCO update

[Tim Parkhurst]

On 4/29/06, Eric Brombaugh <ebrombaugh at earthlink.net> wrote:
> Thanks to everyone on the list for the great response to my post last
> week about the Cypress PSoC-based Digital VCO. There were a lot of
> interesting suggestions and encouragement. I spent some more time
> working on it and I thought I'd give a quick update on what's been added:
>
<snippity snip snip>
> applications. If I do this, I'll only have 2 inputs available for
> defining the waveform. Which 4 of the 7 listed above would be most
> useful? I'd probably keep the sine, triangle, sawtooth and noise. The
> square could be generated in analog by clipping the sine, which might
> actually give fewer aliases if it's clipped after the reconstruction filter.
>
> Thanks for your thoughts!
>
> Eric
>

Hey Eric,

You're project looks like it's shaping up nicely. Keep up the good
work! One quick suggestion about waveforms: how about adding a
double-pulse wave? I know your options for waveform selection are
limited, but the double-pulse looks pretty handy (and different from
the same saw/square/tri/sine seen so many other places). I believe Ian
Fritz's site has some info about the double pulse.
http://home.earthlink.net/~ijfritz/sy_cir5.htm

Basically, it's a width modulated pulse, but one 'pulse' is above 0
and one pulse is below, and (ideally) you can mod the two widths
seperately. Anyway, just a quick thought. Have fun with your project!


Tim (quick thoughts McGraw) Servo
--
"Imagination is more important than knowledge." - Albert Einstein