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

[mark verbos]

Everything but the kitchen synch™.

;)

Mark



> On Sep 16, 2018, at 1:30 AM, 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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