[sdiy] DIY-BBd

[Tom Arnold]

On Fri, Sep 12, 2003 at 04:45:54PM -0400, Michael Boracci wrote:
> Dear Synth-Wizards,
> Is it possible to build a BBD out of discreet components today?
> 
> 
> This may be one of those devices that did not start off in the age of tubes.
> If I am correct in that assumption, then are we at the stage where the
> analog BBD device can no longer be physically recreated without using the
> original IC's? After all, there are some devices that were left in the tube
> domain, and remain there today. Is that the case with a solid state analog
> BBD as well?

Sure.   To recreate an MN3005 you need to build 4096 sample&holds plus a way
to clock it.  Using surface mount tightly packed it should only be able a
foot square.

To give you an idea, I've built 20 stages of BBD using tubes.  Its rather
large to say the least.  I seem to have gathered up some shreds of sanity
but should I lose them again I have a layout that should get me about 100
stages of tube BBD in 8U of rack, which means I should be able to make a cheap
flanger in 2 racks...   With 20 stages, I pass signal, and the signal is
delayed by a tiny bit, and it even sounds sorta like what I put in...

BBD's are still being made in china ( something I seem to like to repeat quite
a bit ).  They are cheap.  Stock up now!  Only 2048 stage but they seem to
work well enough.

-- 
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 - Tom Arnold -       When I was small, I was in love,                  - 
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