[sdiy] CS-80 sawtooth blurp [was Re: Pulser & Ring Mod PCBs...]

[lanterma at ece.gatech.edu]

On Jan 16, 2011, at 12:53 PM, Dave Leith wrote:

> I have a question about the pulser board. Does the cv output
> (downwards ramp) maintain a sawtooth ramp (1) shape at the faster
> speeds or does the top flatten out (2)

...

> 2. does one get higher speeds like this?
> ....        ....         ....         ....
>   .        .   .        .    .       .   .
>      .     .      .     .       .    .      .
>         .  .         .  .          . .         .
>            .            .            .            .

As an aside - I seem to recall some discussion about the CS-80 sawtooth having a little blurp like that, which some folks theorized was part of the CS-80 sound. (Probably a different phenomenon arising for a different reason, but it jogged my memory).

Where was that discussion - ah, here it is! Scott Rider's Old Crow's page:

http://www.cs80.com/vco.html

Ah, yes, that blurp is from a one-shot in the CS-80 VCO. So it's coming from a different source than the Buchla Pulser blurp, probably...

There's a beautiful MOTM-ish-looking board at the bottom of that page... who wants to build one?* :)

- Aaron

*Hint: me me me! ;)