[sdiy] VCO Sync

[karl dalen]

No, my bad, not an NPN, it should be a PNP emitter to supply,
collector to cap for injecting a pulse on the charge cap,
the ramp of the synthacon are falling not rising. Sorry... 

Reg
KD

--- Den fre 2010-04-02 skrev karl dalen <dalenkarl at yahoo.se>:

> Från: karl dalen <dalenkarl at yahoo.se>
> Ämne: Re: [sdiy] VCO Sync
> Till: "David Ingebretsen" <dingebre at 3dphysics.net>, "'synth-diy'" <synth-diy at dropmix.xs4all.nl>
> Datum: fredag 2 april 2010 06.33
> The synthacon core are similar to
> SEM/ARP cores(not entirely but close)
> tie the collector of a NPN to C2 cap (charge cap) create a
> 
> narrow pulse circuit extractor, serial a cap 470p then
> diode,
> anode to gnd catode to 470p cap serial a resistor from this
> 
> junction to base on NPN, serial 10k resistor from base to
> gnd.
> 
> Reg
> KD 
> 
> > ----- Original Message ----- 
> > From: "David Ingebretsen" <dingebre at 3dphysics.net>
> > To: "'synth-diy'" <synth-diy at dropmix.xs4all.nl>
> > Sent: Wednesday, March 31, 2010 10:13 PM
> > Subject: [sdiy] VCO Sync
> > 
> > 
> > >I want to add sync to a "vintage" VCO design
> (Steiner
> > Synthacon VCO) since 
> > >I
> > > can't find the schematics to the Steiner
> Synthasystem,
> > I'm stuck with the
> > > Synthacon VCO which does not have sync.
> > >
> > > I see in the ElectroNotes index, there is an
> article
> > about sync'ing a VCO,
> > > but have not had a chance to look at it yet (I'm
> still
> > at the office
> > > pretending to work while my secretary is at lunch
> :)
> > )
> > >
> > > Does anyone have other references or suggestions
> as to
> > where I can go to
> > > figure out how I can add a sync input (or as
> Nyle
> > called it a phase reset)
> > > to his VCO?
> > >
> > > David
> > >
> > > David M. Ingebretsen M.S., M.E.
> > > Collision Forensics & Engineering, Inc.
> > > 2469 East Fort Union Blvd. STE 114
> > > Salt Lake City, UT 84121
> > > www.CFandE.com
> > >
> > > 801 733-5458 Office
> > > 801 842-5451 Cell
> > >
> > > dingebre at CFandE.com
> > > dingebre at 3dphysics.net
> > >
> > >
> > >
> > > _______________________________________________
> > > Synth-diy mailing list
> > > Synth-diy at dropmix.xs4all.nl
> > > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy 
> > 
> > _______________________________________________
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> > 
> 
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