[sdiy] High frequency VCO designs

[Tom Wiltshire]

Hi All,

What contemporary VCO designs are there that can cope with frequencies between 20-40MHz?

There were several synth designs based on top-octave-dividers that used a high frequency VCO to clock the divider (PolyMoog, for one example). It occurred to me (and I'm not the first) that whilst you can't copy aTOG chip in a PIC, you can adequately copy a single output of a clock chip and it's associated divider. This is closer to the older 12-separate-oscillators-plus-dividers scheme. But that's fine, better even. The important thing is to get some voltage control in there by using a VCO for the uP clock.

So, VC-clocks for a PIC? Any ideas?

Thanks,
Tom