[sdiy] BBD help

[Scott Bernardi]

New link to my website (attbi got sold to Comcast)
http://home.comcast.net/~sbernardi/elec/og2/og3_echo.html

My circuit uses the PT2399, not the PT2395. The difference is that the PT2399 has 64K memory built in, the PT2395 requires an external DRAM chip. You can get longer delays with the PT2395 by using a 256k DRAM. I wasn't able to get a circuit working, with the PT2395 however. I was successful with the PT2399.
Also, the minimum delay is about 30mSec which sounds longer than you wanted. It's really meant for an echo unit, not a chorus/flange.



Dave Magnuson wrote:

>At 03:23 PM 1/23/04 -0700, Joseph Craig wrote:
>  
>
>>I think you were talking about...
>>
>>Princeton PT2395 Enhance Digital Echo IC 
>>
>>I also wanted an analog delay, but after checking prices on BBD chips and 
>>going through all the design work, I have decided to go with a quality 
>>digital solution.  Has anyone designed with the PT2395?  looks decent.  I 
>>just need to build a delay module for my modular synth.
>>
>>-Joe
>>    
>>
>
>
>Scott Stites pointed out these two links for PT2395 based delays a few
>months back:
>
>Scott Bernardi's design:
>http://home.attbi.com/~sbernardi/elec/og2/og3_echo.html
>
>
>PT2399 to emulate a BBD based delay:
>http://www.generalguitargadgets.com/v2/index.php?option=displaypage&Itemid=8
>0&op=page&SubMenu=
>
>Hope these are helpful,
>
>Dave Magnuson
>
>Resonant Frequency:
>resfreq at hoohahrecords.com
>http://www.hoohahrecords.com/resfreq/index.html
>  
>
>------------------------------------------------------------------------
>
>
>---
>Outgoing mail is certified Virus Free.
>Checked by AVG anti-virus system (http://www.grisoft.com).
>Version: 6.0.562 / Virus Database: 354 - Release Date: 1/16/04
>  
>

-- 
Scott Bernardi
sbernardi at comcast.net

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://synth-diy.org/pipermail/synth-diy/attachments/20040123/be4534b2/attachment.htm>