[sdiy] High frequency VCO as BBD clock

[David Moylan]

I've had good luck clocking 4046 from 100 kHz up into the low Mhz.  
Wasn't driving BBDs so there wasn't much load to deal with, but might be 
easier than doing an HF VCO from scratch.

On 2/7/23 1:18 PM, Rutger Vlek via Synth-diy 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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-- 
David Moylan
Expedition Electronics
sonic adventures!