[sdiy] as3340 PW/tuning issue

[ColinMuirDorward]

Just a note to say thanks to everyone contributing to this conversation.
I've applied lots of what I learned here to my design, and I've got the
PWM/pitch interaction down to what I think is an acceptable minimum.
Anyways, it's nothing special, but I've started a build thread over at muffs
<https://www.muffwiggler.com/forum/viewtopic.php?f=17&t=225670>, for anyone
who needs yet another low cost 3340 vco. I need several, so thought I may
as well go public in case anyone else does, too. I'll be using JLCPCB
assembly for all the resistors and caps, and the rest will be through hole
at home. I have lots of as3340s, so can include with the PCB if anyone
needs. 3340 is running on +10/-5, so the circuit should be at home in 12v
or 15v setups. I'm in Yukon, Canada.
Thanks,
Colin

On Fri, Jan 3, 2020 at 12:39 PM David G Dixon <dixon at mail.ubc.ca> wrote:

> The Intellijel Rubicon (and Rubicon-2) gives the option of generating
> pulse waves from Triangle, Saw, or Double-Saw (twice the frequency).  It’s
> not a whole synth, just a TZFM VCO.
>
>
> ------------------------------
>
> *From:* Synth-diy [mailto:synth-diy-bounces at synth-diy.org] *On Behalf Of *Mattias
> Rickardsson
> *Sent:* Friday, January 03, 2020 6:57 AM
> *To:* Richie Burnett
> *Cc:* Brian Willoughby; Synth DIY
> *Subject:* Re: [sdiy] as3340 PW/tuning issue
>
>
>
> On Fri, 3 Jan 2020 at 10:31, Richie Burnett <rburnett at richieburnett.co.uk>
> wrote:
>
>
> ... The faster the rate of change of the LFO waveform the greater the
> pitch modulation. Try whacking LFO speed up and listen to the seasick pitch
> warble on most synths with pwm!
>
> However, pwm generated from a triangle waveform source results in both
> edges of the pulse waveform being modulated equally and in opposite
> directions. Therefore the centroid of the pulses doesn't move and there is
> no resulting pitch modulation. That's one of the advantages of using a
> triangle wave instead of sawtooth to generate PWM waveforms.
>
>
>
> I'd say this chorus-y pitch warble is often a desired and/or useful
> feature of the PWM setting for many people.
>
> Is any commercial synth known for using the triangle wave to create the
> pulse wave without warble?
>
>
>
> /mr
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