Soft sync and medicine to cure it.

[Rob]

Er, I *have* heard about this before to keep osc from locking. Actually, the
guy was talking about oscillators within a piece of radio gear. Injecting
noise on the PS line does work. Or, you could just overdrive the regulator a
little bit and keep it just at its maximum so it is slightly out of
regulation and noisy.
Or, maybe have a very small (like 1pf) cap somewhere on one osc cv input and
not on the other. I believe the Arp Oddysey is like that (as a matter of
fact, I am fairly sure it has, I had to remove one of these caps to make osc
2 quit warbling).

Or, you could just put a seperate regulator for each of the oscillators.
That might do it.

Lots of things you could try.. But, first off, I would say to put a very
small filter cap on the CV input of one osc (but not the other) and see what
happens. That *might* be enough.

BTW, has anyone actually seen the pulse that syncs the oscillators on a
scope? I have tried and tried, but it seems that merely the stray
capacitance of the probe makes it stop!

Rob

----- Original Message -----
From: jhaible <jhaible at debitel.net>
To: Magnus Danielson <cfmd at swipnet.se>
Cc: diy <synth-diy at node12b53.a2000.nl>
Sent: Monday, September 11, 2000 5:31 PM
Subject: Re: Soft sync and medicine to cure it.


> > This discussion also makes me think of the MiniMoog, too weak
powersupply
> and
> > thus noisy powerlines which made it less prone to lock the oscillators
to
> > each other. When I was in Gothenburg and standing in line to get some
> coffie I
> > also came to think of the addition of noise into the oscillator CVs in
> order
> > to make them less eager to lock. Maybe that could also be of interest.
> However,
> > the noise level should not be too high.
>
> One should be able to introduce a controlled amount of psu noise at the
> reference
> pin of adjustable 3-pin voltage regulators (AC-coupling for the noise).
Not
> testet.
>
> JH.
>
>
>
>
>
>
>
>
>