[sdiy] Yusynth VCO

[Walker Shurlds]

Hey D,

I see the same current mirror >> integrator >> comparator >> FET thing
as the actual oscillator that you see in the ASM-1's VCO, which is what
I'm working on understanding.  If I remember correctly that one is
inspired by the ENS-76.  Compared to the ASM-1, the comparator is
set up differently: there's an extra diode and capacitor and it's
lacking a BJT connected to the base of the FET.

Also the integrator is weird, uses the virtual 5V from the opamp in the
upper left instead of using a virtual ground from somewhere.  Because
of this (I'm guessing), it lacks an inverter that the ASM-1 has before
the waveshaping.

It's looks interesting for sure.  I sense there's a bunch in there more
I can learn from it.

Walker

On Sat, 3 Apr 2010 23:15:04 +0200
cheater cheater <cheater00 at gmail.com> wrote:

> Cool.. any idea what other (more classic?) VCO design they are based
> on or the closest to?
> 
> I think I noticed your name mentioned on the Yusynth page :-)
> How much did the cost work out to for you?
> 
> BTW, here's the page with board/schematics for anyone who's
> interested: http://yusynth.net/Modular/EN/VCO/index.html
> and some (sadly mp3) demos of a modular based on yusynth modules. They
> sound real nice:
> http://www.rainbow-serpent.de/index.php?page=modular
> 
> Cheers
> D.
> 
> On Sat, Apr 3, 2010 at 22:44, Csaba Zvekan <czvekan at gmail.com> wrote:
> > Yes, I have built six of them . Even with hand matched transistors
> > just to try them out. They work wonderful . A truly great design.
> >
> > Csaba
> > On Apr 3, 2010, at 9:05 PM, cheater cheater wrote:
> >
> >> Hi guys,
> >> I was wondering if anyone here has used/built the Yusynth VCO. Any
> >> thoughts about it?
> >>
> >> Anyone know what design it is based on? I'm still nowhere near good
> >> enough to read the schematics on that thing :-)
> >>
> >> Thanks
> >> D.
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