> 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.

It's possible. The A-143-9 does this job (kind of a filter in
self-resonance). The only thing we would have to add is the temperature
compensation of the exponential generator to obtain a stable 1V/oct
characteristics. Maybe we can design a A-143-9 Version 2 with this
additional feature.

Best wishes
Dieter Doepfer