[sdiy] High frequency VCO as BBD clock

[Rutger Vlek]

Dear list,

For a while I've been working on a guitar pedal board for personal use. I'm
about to build the second revision of a solid state pre-amp, and was
thinking about possible modulation effects too. I would love a nice
(stereo) BBD flanger/chorus, but felt a bit fed-up with all the 'classic'
designs, particularly the traditional clocking scheme, usually with a
limited range, lack of current drive (to overcome capacitance of the BBD
clock input) and strictly linear modulation (calling for a hyper-triangle
modulation source).

Having some experience with designing saw- and tri-core VCO's around the
2164, I was wondering how easy it would be to push the design of a typical
tri-core VCO with an 2164-based expo converter into higher frequencies
(let's say up to 500kHz) and use it to clock a BBD? Has anyone tried? Or
are there fundamental reasons why such frequencies are not possible? I've
never (intentionally) worked with circuits outside of the audio bandwidth...

Rutger
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