[sdiy] Odp: Pink?
mr at analogue.org
Tue Aug 21 13:32:57 CEST 2018
On Tue, 21 Aug 2018 at 13:07, Ian Fritz <ijfritz at comcast.net> wrote:
> I figured out a way to do pretty much all of this years ago. You may find
> it on my website as The SNICster waveshaper. (There was also some
> discussion here.) It is driven by a standard Saw-core VCO, and I believe
> most of your requirements are automatically met.
Yes, that's one of the few attempts I've seen doing something like this.
Thanks for the reminder!
> > On Aug 21, 2018, at 4:01 AM, Mattias Rickardsson <mr at analogue.org>
> > Designing such a slewed sawtooth VCO in a more thorough fashion might be
> somewhat of a heavy exercise. I'd want the slewrate to be a controllable
> parameter; I'd want it to follow exponential and linear control - something
> that would need to work regardless of the slewrate used; I'd want the
> timing of other generated waveforms to follow the zero crossings and not
> the peaks of the sawtooth; and finally, for FM duties and freedom of thumps
> I'd want the saw to be DC-free, meaning that the start and end of the
> slewed reset slope would need to be equally far from zero - which wouldn't
> be the case of an ordinary sawtooth with a slew function hung onto its
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