[sdiy] BBD Chips

[Fdi]

So what would be the usable delay time range for that kind of feedback? (for
PM)
If it's a very short delay, could this be done with some sort of filtering,
phase cells, inductors...?
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f
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> De: "jhaible" <jhaible at debitel.net>
> Fecha: Tue, 22 Jul 2003 12:49:08 +0200
> Para: "Fdi" <fdi at ran.es>, <synth-diy at dropmix.xs4all.nl>
> Asunto: Re: [sdiy] BBD Chips
>
>> I also thought that by driving it from a high speed clock one can get
very
>> short delays (uSec?)
>>
>> In fact I'm interested on BBDs or any kind of cheap delay to do
>> analog-pseudo-phisical-modeling synthesis experiments.
>> JH used his flanger as a delay for that pourpose with very interesting
>> results...
>>
>> Wich will be the delay time range to do that kind of delayed feedback?
> Less
>> that a millisecond?
>>
>> Is there any simple circuit out there to get such a short delay? Using
> wich
>> chip?
>
> For my PM experiments I've used a Flanger with two 512 stage BBDs.
> 512 stages are used for ultra short delays (incl. PM stuff), two BBDs
> in series are used for very low, hollow flanger sounds.
> If you only want one chip, I'd go for 512 stages.
>
> But: I really don't know what the upper clock limit is for various BBD
> circuits from different manufacturers. Of course a 1024 stage chip
> @ 1MHz would allow shorter delays than a 512 stage chip with
> max. 400kHz clock.
>
> And to make things more complicated, the max clock rate of BBDs
> is sometimes "understated" in the data sheet. And a better clock
> circuit will probably give useful results at higher clock rates than a
> simple one.
>
> JH.
>
>
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