Please give more details - which Euro VCOs are using this circuit I don't see this in any
Doepfer VCO nor any of m ASys. I'm guessing Plan-B and ZO do use it. Who else

Ask Dieter if it adding 2 additional trimpots, a matched transistor pair and the labor to
calibrate and set two additions parameters would make a any difference in the price of his
VCOs

--- In Doepfer_a100@yahoogroups.com , Anthony Rolando <goldenechos@...> wrote:
>
>
> I hate to break it to you, but there is nothing terribly different, complex or expensive
about the SINE circuit in the schematic linked below. Pretty common stuff.
>
> TOny
>
> > To: Doepfer_a100@yahoogroups.com
> > From: caymus91@...
> > Date: Sat, 29 Nov 2008 18:18:24 +0000
> > Subject: 1 Re: starting a modular - Z3000 waveform quality
> >
> > Actually the high-quality sine circuit is *quite* common. According to my schematic
> > library, most vintage oscillators used this standard design. For example, my Aries
VCOs
> > produce a pretty good purity sine using this:
> >
> > http://www.leinermedia.net/aries/AriesSchematics/AR-317s.gif
> >
> > My guess is modern VCO designs use the cheap low-quality diode circuit instead
because:
> >
> > A - the simple diode circuit requires no calibration where the Hi-Q one has two trim
pots
> > to set (symmetry and purity).
> >
> > B - According to this thread it appears many analog users are unaware or
inexperienced
> > with quality VCO sines. So there no customer demand.
> >
> > BTW, nobody is advocating "pure" sines - just ones with no audible harmonic
distortion.
> > That's certainly is easy to design in analog.
> >
> >
> >
> >
> > --- In Doepfer_a100@yahoogroups.com , Florian Anwander <fanwander@> wrote:
> > >
> > > Hi laryn91
> > >
> > > > I don't get it either. All I asked is if anyone knows of any euro VCO that can
produce a
> > sine
> > > > wave without audible harmonic distortion (Plan-B and ZO so far). To me this a
very
> > useful
> > > > feature.
> > > I don't know that there would exist any schematic for this. I never have
> > > seen a schematic for a pure sine oscillator that is V/Oct voltage
> > > controlled. I may be wrong, but I think it is not really possible.
> > >
> > > Florian
> > >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>
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>