[sdiy] SAW core VCO flyback time
David G Dixon
dixon at mail.ubc.ca
Thu Sep 1 17:36:36 CEST 2016
> Totally agree here Don, but one thing left to talk about is
> PWM. I have noticed that on a lot of Tri cores the Sqr is
> derived from the Tri, not the Saw, is there any reason for
> this? If you use the Tri you can't get that lovely PWM
> vibrato sound. In fact perhaps even have a switch so you can
> pick between Saw or Tri for the source of the Sqr.
All my personal VCO designs have this "centre/edge" switch. However, I have
to say that, in practice, I have found it to be pretty useless.
> There is still the downside of traditional hard sync, yes
> David "interesting" is great but what if you want regular old
> hard sync? How much hassle would it be to implement a regular
> hard sync on a Tri core?
Not really much of a hassle at all. The new Dixies have it. The Rubicon
has it. It's basically a standard resetting JFET with one small addition,
and it works well.
> If you could get regular PWM and hard sync from a Tri core
> then it does sound like the way to go. Then for all those
> people that love buzzy Tris they can add a pulse to get it.
A classic tri-square oscillator offers some other real advantages for FM as
well. We have exploited these in the Rubicon.
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