[sdiy] BBD help

Sat Jan 24 08:15:41 CET 2004

I have had the PT2395 running, and it's delays are quite long. If using the
"short" mode and 64k ram, it may be possible to shorten the delay further by
dropping address lines (i.e., going to 32k or 16k), which can only be done
when using external RAM. 

Ken

>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).
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>>  
>>
>
>-- 
>Scott Bernardi
>sbernardi at comcast.net
>
><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
><html>
><head>
>  <meta http-equiv="Content-Type" content="text/html;charset=ISO-8859-1">
>  <title></title>
></head>
><body text="#000000" bgcolor="#ffffff">
><pre wrap="">New link to my website (attbi got sold to Comcast)
><a class="moz-txt-link-freetext"
href="http://home.comcast.net/~sbernardi/elec/og2/og3_echo.html">http://home
.comcast.net/~sbernardi/elec/og2/og3_echo.html</a>
>
>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.
></pre>
><br>
><br>
>Dave Magnuson wrote:<br>
><blockquote type="cite"
> cite="mid3.0.6.32.20040123184729.007bbe90 at hoohahrecords.com">
>  <pre wrap="">At 03:23 PM 1/23/04 -0700, Joseph Craig wrote:
>  </pre>
>  <blockquote type="cite">
>    <pre wrap="">
>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
>    </pre>
>  </blockquote>
>  <pre wrap=""><!---->
>
>Scott Stites pointed out these two links for PT2395 based delays a few
>months back:
>
>Scott Bernardi's design:
><a class="moz-txt-link-freetext"
href="http://home.attbi.com/~sbernardi/elec/og2/og3_echo.html">http://home.a
ttbi.com/~sbernardi/elec/og2/og3_echo.html</a>
>
>
>PT2399 to emulate a BBD based delay:
><a class="moz-txt-link-freetext"
href="http://www.generalguitargadgets.com/v2/index.php?option=displaypage&It
emid=8">http://www.generalguitargadgets.com/v2/index.php?option=displaypage&
amp;Itemid=8</a>
>0&op=page&SubMenu=
>
>Hope these are helpful,
>
>Dave Magnuson
>
>Resonant Frequency:
><a class="moz-txt-link-abbreviated"
href="mailto:resfreq at hoohahrecords.com">resfreq at hoohahrecords.com</a>
><a class="moz-txt-link-freetext"
href="http://www.hoohahrecords.com/resfreq/index.html">http://www.hoohahreco
rds.com/resfreq/index.html</a>
>  </pre>
>  <pre wrap="">
><hr width="90%" size="4">
>
>---
>Outgoing mail is certified Virus Free.
>Checked by AVG anti-virus system (<a class="moz-txt-link-freetext"
href="http://www.grisoft.com">http://www.grisoft.com</a>).
>Version: 6.0.562 / Virus Database: 354 - Release Date: 1/16/04
>  </pre>
></blockquote>
><br>
><pre class="moz-signature" cols="72">-- 
>Scott Bernardi
><a class="moz-txt-link-abbreviated"
href="mailto:sbernardi at comcast.net">sbernardi at comcast.net</a></pre>
></body>
></html>
>
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au  
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>