Yet another BBD question...

[Brousseau, Paul E (Paul)]

Thanks for the description (and to the folk who e-mailed me directly!)  What
does "limited range" mean?  That sounds simple, but do you mean that you
can't achieve certain frequencies?  If so, why?  

Something that seems strange to me... wouldn't you need two lines, really?
I mean, can a cap discharge and charge at the same time?  It seems to me
that you would need to alternate two rows, one is charging, the other
discharging, and your output is always from the discharging row.

Are there other ways to do analog delays?

--PBr

> -----Original Message-----
> From:	Harry Bissell [SMTP:harrybissell at prodigy.net]
> Sent:	Tuesday, January 25, 2000 8:09 PM
> To:	Brousseau, Paul E (Paul)
> Cc:	synth-diy at mailhost.bpa.nl
> Subject:	Re: Yet another BBD question...
> 
> OK I'll get it
> 
> its Bucket Brigade Device (or delay...). The idea is a long string of
> analog
> sample and hold circuits. There is a high frequency (dual phase like Q and
> not
> Q) clock, which causes the charges to be passed to the next stage in
> succession...
> 
> like firemen passing buckets of water to the next guy in line... there is
> a
> continuous stream of water being delivered to the output, delayed by the
> time
> it took to pass the buckets through  (oh...) 512 men...
> 
> Now picture that each bucket is filled with a different amount of water
> (corresponding to the input (audio) voltage at the time it was filled.
> Then at
> the other end the bucket is emptied and the (audio) voltage is
> recovered...
> 
> Plus some slop, and noise, and limited range (you can't make the buckets
> too
> empty or nothing comes out, or too full, they overflow and never reach the
> fire...) and there is the noise of the clock bleeding through to be
> filtered
> out....
> 
> which IMHO makes BBDs SUCK
> 
> opinion for comparison purposes only
> actual mileage may vary...
>