[sdiy] Relative merits of various BBD's

[Scott Stites]

The Marshall Time Modulator uses CCD's, I believe.  IIRC, they were custom
chips(?).  Stephen St. Croix quoted some incredible S/N results using them,
he definitely was of the opinion that these chips were much, much better
than BBD's.

A great interview with St. Croix concerning this appears in a couple of
issues of the late, great magazine "Device" .  All twelve copies can be
found at Mark Hammers excellent site, along with great amount of other
things.  Well worth the visit, and do grab those Device PDF's if you haven't
done so already.

http://ampage.org/cgi-bin/hammer/index.cgi

Cheerio,
Scott


----- Original Message -----
From: "Tom Arnold" <xyzzy at sysabend.org>
To: "anthony" <aankrom at bluemarble.net>
Cc: "Synth-Diy" <synth-diy at dropmix.xs4all.nl>
Sent: Friday, January 21, 2005 6:10 PM
Subject: Re: [sdiy] Relative merits of various BBD's


> On Fri, Jan 21, 2005 at 07:36:54PM -0500, anthony wrote:
> > But hold up, you mentioned misusing CCD's. I'm sure I missed that
thread.
> > The physics is pretty much the same so I think it would work. Do you
just
> > look at the pins of the CCD and figure out which ones correspond to the
> > BBD's?
>
> I found some fax machine CCDs that are just 8192cell BBDs.  I put an LED
on
> one end, and cover the whole thing with heatshrink tubing.  Feed signal in
> and clock the CCD.  You're not supposed to clock the CCD with the lamp on
> cause, well, it wouldnt work for its original application.. but it works
> fine for audio, if a little noisier then a normal BBD.
>
> Newer fax machines have an electronic shutter or bounce the cell voltage
> back to a secondary BBD before stepping the scanned line out and thus work
> work for this, and with BBDs still being made there's not much call for it
> but was a fun exercise.
>
> --
>  -----------------------------------------------------------------
>  - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org
>  - SynthGeek        -
>  - BBD Fanatic      -  "...is it a virus, a drug, or a religion?"
>  - echo evho wjxo   -    Juanita Shrugs. "What's the difference?"
>  --------------------
>