[sdiy] High frequency VCO as BBD clock

[S Ridley]

The Serge WAD (Wilson Analog Delay) might be worth a look - high frequency
VCO driving two SAD1024s.

https://www.elby-designs.com/webtek/cgs/serge/cgs208/cgs208_schematic.gif

Spec says delays down to 0.5mS, dunno how well it tracks.  HF VCO is expo
converter driving a CMOS oscillator.

Steve



On Tue, 7 Feb 2023 at 18:21, Rutger Vlek via Synth-diy <
synth-diy at synth-diy.org> wrote:

> 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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