osc sync

[Rob]

DUH! I dont know what I was thinking. Of course: Pull the base of the fet hi
(12v) and then that latch type configuration above it will turn off, as will
the output of the trig-saw converter.. Wonderful!

Thanx for the knock upside my head!
;)

Rob

BTW, syncing two of these oscillators and running the whole deal through the
303 filter makes for the most liquid filter oscillations I have EVER heard..
Makes it sound like my Arp but with a more well behaved filter.


----- Original Message -----
From: Harry Bissell <harrybissell at prodigy.net>
To: Rob <cyborg_0 at iquest.net>; <synth-diy at mailhost.bpa.nl>
Sent: Saturday, January 29, 2000 10:48 PM
Subject: Re: osc sync


> Don't know if you have the same schematic as me...but it looks like you
want to
> pull the cap (C33) to +12 volts, either by forcing a reset, or using a
fet.
> Maybe JH or Tony (who makes the 303 clone) could add more info.  Q25,26
and 27
> make the reset circuit, they form sort of a triac crowbar... once
triggered they
> conduct until current flow stops. You might fool around in that area. I'd
try
> the fet myself...
> H^)   harry
>
> Rob wrote:
>
> > Well, I am proud to announce that I figured out a way to sync two tb303
type
> > oscillators, but its just soft sync where they will sync up if they are
a
> > harmonic of one another. Im going to try to add hard sync, but it looks
like
> > Im going to have to somehow discharge the trig-saw converter cap to
force it
> > to drop to zero.
> > Now, my next question is, is this correct?? Is it even possible to
> > "hard-sync" this type of trigger to saw converter oscillator?
> > I know I can reset the saw converter output to zero, but I can see
problems
> > because of the 5 volt reference involved. I can't just short the across
the
> > cap input to ground because it will whack the oscillator out of tune and
it
> > won't recover quickly enough.
> >
> > Maybe short the cap to some nominal resistance to ground? Im kind of
stumped
> > on this one.
> >
> > Rob
>
>