[sdiy] High frequency VCO as BBD clock

[Oren Leavitt]

The LM331 (still in production) may also be a consideration, although it 
is limited to 100kHz max.

Ian Fritz's DoubleDeka VCO is an example:

http://ijfritz.byethost4.com/DD_web.pdf

- Oren

On 2/7/23 12:55 PM, rrsounds via Synth-diy wrote:
> Generally speaking, BBD devices have a limited number of “buckets." 
> The faster you cycle through them, the shorter the delay. 500kHz is 
> going to result in a pretty short delay. On the positive side, the S/N 
> is also related to cycling rate, resulting in a much cleaner result at 
> higher rates.
> Are BBDs even still produced?
> David Reaves
>
>> On Feb 7, 2023, at 19:18:08PM, 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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