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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