[sdiy] DIY-BBd

[Oren Leavitt]

Visitor to SynthDIYer's place:
"Wow! Those are groovy lookin' Christmas lights you got goin' 'round 
your house!"

SynthDIYer:
"That is my 1024 stage vacuum tube BBD!"

Michael Boracci wrote:

>Thanks for the perspective. I appreciate that. I am not surprised that you
>built a tube BBD, and it must be a sight to behold. I would not want to lay
>out that foot square board you mentioned.
>
>MB
>
>-----Original Message-----
>From: Tom Arnold [mailto:xyzzy at sysabend.org]
>Sent: Friday, September 12, 2003 5:11 PM
>To: Michael Boracci
>Cc: synth-diy at dropmix.xs4all.nl
>Subject: Re: [sdiy] DIY-BBd
>
>
>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.
>
>--
> ------------------------------------------------------------------------
> - Tom Arnold -       When I was small, I was in love,                  -
> - Sysabend   -       In love with everything.                          -
> - CareTaker  -       And now there's only you...                       -
> --------------         -- Thomas Dolby, "Cloudburst At Shingle Street" -
>
>
>
>
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-- 
Oren Leavitt
oleavitt at ix.netcom.com