[sdiy] Tri-core oscillator sync

[Mattias Rickardsson]

If you do soft sync with your reversing sync, you let it perform most of
its cycle before allowing it to sync, so I don't see any problem there.

With hard-synced reversing sync OTOH the resulting amplitude can get
arbitrarily small just as you say.

/mr

On Tue, 18 Dec 2018 at 13:33, ulfur hansson <ulfurh at gmail.com> wrote:

> regarding reversing sync, i imagine the output amplitude will drop if the
> sync input exceeds the oscillator base frequency (just like the common DCO
> design problem)
>
> am i misguided or is this a problem that has to be addressed while
> designing a soft-syncable oscillator?
>
> Sent from outer space
>
> On Dec 18, 2018, at 12:12 PM, Mattias Rickardsson <mr at analogue.org> wrote:
>
> I'd rather define it like:
>
> "Hard sync" syncs the slave every time,
>
> "soft sync" syncs the slave sometimes, i.e., when it has completed enough
> of its cycle.
>
> Then the actual sync type in both these above sync methods can be either
> "reset sync" or "reversing sync".
>
> /mr
>
>
> On Tue, 18 Dec 2018 at 06:45, Michael E Caloroso <
> mec.forumreader at gmail.com> wrote:
>
>> "Hard sync" means that the charging core is prematurely reset by an
>> external trigger.  It is intended to create a complex waveshape with
>> altered harmonics.  By altering the frequency of the sync'd VCO above
>> that of the master VCO, you sweep the harmonics.
>>
>> "Soft Sync" means the slave VCO is oscillating at the same frequency
>> of the master VCO.
>>
>> MC
>>
>> On 12/17/18, Tim Ressel <timr at circuitabbey.com> wrote:
>> > Hi,
>> >
>> > I have made a triangle core oscillator that works really well except for
>> > the sync. I implemented what I thought would be hard and soft sync but
>> > the results were disappointing. As I understand it my "hard sync" is
>> > known as "reversing sync" i.e. a rising edge causes the steering flip
>> > flop to change state and thus the wave reverses. My "soft sync" changes
>> > the upper set point on the window comparator.
>> >
>> > I would like the soft sync to sound like the Doepfer A-110-2 oscillator
>> > soft sync if possible.  Thoughts?
>> >
>> > --
>> > --Tim Ressel
>> > Circuit Abbey
>> > timr at circuitabbey.com
>> >
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