[sdiy] Adding "sync" to a Through-Zero Sinewave Oscillator design
admin at bugbrand.co.uk
Sun Sep 16 08:54:30 CEST 2018
David - does your hard sync do as Don suggests "
the sync pulse should bring it to 0V, ascending.
I've always used this hard sync approach but the waveform can rise or
fall from this reset point.
(sorry, straying off topic)
On 16/09/2018 07:45, David G Dixon wrote:
> The Intellijel Rubicon 2 is a through-zero VCO which I designed, and it has
> both kinds of sync. We call them "Hard" and "Flip" on the panel, but I
> always think of them as "Reset" and "Reverse". The Resetting sync is
> achieved in the normal way, with a JFET across the integrator capacitor.
> The Reversing sync is achieved by syncing to the threshold input pin of the
> comparator in the tri-square core.
>> -----Original Message-----
>> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On
>> Behalf Of Donald Tillman
>> Sent: Saturday, September 15, 2018 10:31 PM
>> To: ulfur hansson
>> Cc: synth-diy mailing list
>> Subject: Re: [sdiy] Adding "sync" to a Through-Zero Sinewave
>> Oscillator design
>>> On Sep 15, 2018, at 3:26 PM, ulfur hansson <ulfurh at gmail.com> wrote:
>>> 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?
>> There are several way to sync a triangle wave.
>> The technically correct way would be to force the oscillator
>> to the start of the waveform. So if it's advertised as a
>> sine wave, the sync pulse should bring it to 0V, ascending.
>> I'll claim that reversing the direction of the wave is not
>> actually a sync. The word "synchronize" means to bring an
>> oscillator to the same frequency, and same phase, as another.
>> I don't think that's remotely possible by flipping the
>> direction of the triangle every cycle.
>> I'd even call it "anti-sync".
>> But if it's an expressive sound, it's probably worth coming
>> up with a better name.
>> -- Don
>> Donald Tillman, Palo Alto, California
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