Doepfer

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: [Doepfer_a100] 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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