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

[Richie Burnett]

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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> Synth-diy mailing list
> Synth-diy at synth-diy.org
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