[sdiy] Oscillator sync schemes

[David G. Dixon]

I've implemented a flavour of this in my triangle-core VCOs.  Basically, I
take an incoming square or ramp wave through an attenuator, convert it to a
pulse, and sum it with the triangle wave.  This sum is then sent to the
schmitt trigger which flips at +/-5V.  If the sum of the triangle and the
sync pulse are >= +5V or <= -5V, and the trigger is already set at the other
voltage, then the trigger flips, which sends the triangle in the opposite
direction.  The probability of synching is determined by the attenuator.  I
wouldn't call this "soft synching".

> > I think the reference here is to a triangle core vco as opposed to a
> > ramp core.  Some sync circuits cause the integration circuit in the
> > tirangle core to reverse direction.  I've seen this referred to soft
> > sync.
> 
> I think I gave doing a MATLAB simulation of that as a homework problem
> once...
> 
> - Aaron
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