[sdiy] BBD help

[Scott Stites]

Hi List,

You may or may not imagine how gut-wrenching it is to see a thread that trips
your trigger come through after an hour of re-configuring a modem to pulse
dialing, fighting a remote email server, then logging off and reading the thread
and not being able to link back in a reply.

Anyhow, anything I had to say has already been said - Ken Stone has the PT2395
evaluation board coming out (whoa!  The RAM mirror imaged on the datasheet? 
Thanks for that note Ken - I would have gone berserk!!), Scott Bernardi has the
cool PT2399 module, yep, the PT2399 won't go low enough for delay, a 1024 or 512
stage BBD probably would if it was overclocked (which is what a lot manufacturers
routinely did), the PT2395 might if you diddle with the address lines, and
Harry's right - be veeewwwyyyy caweful with BBD's.  And BBD's are noisy, but God
I love'em (bless their little silicon substrates).  Whew!  There - I said it!

As it so happens, I resurrected my PT2399 proto-board after a rest of over a
year, and kludged a very simple mixer to play with it over the Christmas break. 
I use either a FET or an expo current sink, directly lifted from Rene Schmitz, to
CV the delay time.  The delay portion is directly from the datasheet's 'Surround
Sound' example with a mixer for regeneration.

I've got some samples on my 'Birth of a Synth' page where I (over)use it quite a
bit.  Bear in mind it is the barest of circuits, but it gives you somewhat of an
idea of the nature of the beast.  Scott Bernardi - have you posted any samples of
yours?  Can't check right now - internet connection costs an arm and a leg out of
this hotel........

The samples are here:

http://mypeoplepc.com/members/scottnoanh/slsdiy/id18.html

They are under '18 January' and '30 December'

Cheers,
Scott

________________________________________________
PeoplePC:  It's for people. And it's just smart. 
http://www.peoplepc.com