[sdiy] Adding "sync" to a Through-Zero Sinewave Oscillator design

[Quincas Moreira]

Paging mr Ian Fritz......

On Sat, Sep 15, 2018 at 6:33 PM Richie Burnett <rburnett at richieburnett.co.uk>
wrote:

> I guess the OP meant the frequency changes sign?
>
> Homophones "sine" and "sign" in the same sentence always sounds confusing!
> At least we haven't had "sinc" and "sync" yet ;-)
>
> -Richie.
>
> -----Original Message-----
> From: Tom Wiltshire
> Sent: Sunday, September 16, 2018 12:02 AM
> To: ulfur hansson
> Cc: synth-diy mailing list
> Subject: Re: [sdiy] Adding "sync" to a Through-Zero Sinewave Oscillator
> design
>
> I thought triangle oscillators didn’t change *sign*, but rather changed
> *direction*.
>
> Changing sign would imply that a waveform at +2V would jump abruptly to
> -2V.
> Changing directions means only that a waveform that has been rising up to
> +2V would start falling instead.
>
> > On 15 Sep 2018, at 23:26, ulfur hansson <ulfurh at gmail.com> wrote:
> >
> > hello list!
> >
> > i have been working on a prototype for a through zero quadrature
> sinecore
> > oscillator over the past few weeks, and have been thinking of ways to
> add
> > a novel type of "sync" to the circuit.
> >
> > I love the way traditional triangle core oscillator sync sounds, and
> much
> > prefer it to the harsher sawcore type sync.
> >
> > with trianglecore sync (I hope I understand this correctly) the waveform
> > changes sign at trigger points rather than doing a hard reset to 0v,
> > right?
> >
> > since my oscillator is through zero, my idea is to implement a switch
> that
> > inverts the incoming v/8 CV everytime the "sync" input exceeds a certain
> > threshold.
> >
> > this would (in my mind) effectively only change sign of the sine
> waveform,
> > emulating the triangle core sync i mentioned before.
> >
> > before I start gathering components and laying out a sync prototype
> board,
> > i'd love to see if any of you think this is a ridiculous idea - and if
> > there is any literature out there on various methods of sync, i would
> love
> > to learn more about it beyond discharging integrator caps to ground :)
> >
> > thanks so much for your insight!
> > all the best,
> > -úlfur
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-- 
Quincas Moreira
Synth Diy Guy
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