[sdiy] classic transistor VCO's

[harrybissell at wowway.com]

The (usual) catch is that transistors are often sorted
in pairs, etc.  You may need to match NPN pairs, or PNP pairs..

or worse, an NPN/PNP pair for an expo converter.  Its not hard to
do but you might get a batch of transistors that yeilds a LOT of
good pairs, or one that is almost useless.

For manufacturing, this is a bad thing. What do you do with the
fallouts ? 

Poly-Paks anyone ??

H^) harry



On Thu, 1 Jan 2009 07:59:42 +0000, Dan Snazelle wrote
> Ok
> 
> so i got the Odyssey manual and the 2600 oscillator sub module 
> (although i cant find schematic for the earliest vco submodules)
> 
> and all i can say is WOW
> 
> it is SO easy to READ compared to MOOG or BUCHLA.
> 
> so, i guess my question is WHAT IS THE CATCH? all this easy to read 
> stuff seems like a gold mine of ideas!!
> 
> thanks
> 
> wasnt someone doing an Odyssey vco pcb at some point?
> 
> --------------------------------------------
> check out various dan music at:
> 
> http://www.myspace.com/lossnyc
> 
> http://www.soundclick.com/lossnyc.htm
> 
> http://www.indie911.com/dan-snazelle
> (or for techno) http://www.myspace.com/snazelle
> 
> ________________________________
> > Date: Wed, 31 Dec 2008 21:17:02 -0600
> > From: megaohm1 at gmail.com
> > To: subjectivity at hotmail.com
> > Subject: Re: [sdiy] classic transistor VCO's
> > CC: synth-diy at dropmix.xs4all.nl
> >
> > Various ARP VCOs are discrete. I'm thinking of the Odyssey oscillators.
> >
> > On Wed, Dec 31, 2008 at 2:45 PM, Dan Snazelle> wrote:
> >
> >
> >
> >
> >
> > ok
> >
> >
> >
> > the recent topics have gotten me looking for small vco's or noisemakers
> >
> >
> >
> > i remembered the 303 had a transistor VCO but even with XOXBOX redrawn
schematics, the schematic is a bit confusing) (this could just be the layout
of the schematic)
> >
> >
> >
> > but there must be others.
> >
> >
> >
> > I know ems used transistor vcos at some point
> >
> >
> >
> > are there any others? the key here is small and not stable
> >
> >
> >
> > heck, it could even be some wildly unstable magazine vco.
> >
> >
> >
> > i am just wanting to get some small transistor circuits going ( a la ciat
lonbarde)
> >
> >
> >
> > anyway.....hope this topic isnt too similar
> >
> >
> >
> >
> >
> > thanks
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > --------------------------------------------
> >
> > check out various dan music at:
> >
> >
> >
> > http://www.myspace.com/lossnyc
> >
> >
> >
> >
> >
> > http://www.soundclick.com/lossnyc.htm
> >
> >
> >
> >
> >
> > http://www.indie911.com/dan-snazelle
> >
> > (or for techno) http://www.myspace.com/snazelle
> >
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> >
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> >
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> >
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Harry Bissell & Nora Abdullah 4eva