[sdiy] Digital echo chip

[Scott Gravenhorst]

It's another of Murpy's Laws that says the site you
looked at casually yesterday will be down today simply
because now you NEED it.

The data sheet talks about "1 bit digitized" as "ADM"
modulated, and they don't define "ADM" per se.  The DRAM
needed is single bit wide.  I wonder if this is some 
kind of PCM ??  They don't describe the digitization much
other than that, so it's hard to know what digital resolution
is attained.  They call it "low distortion", but show 
different distortion specs, one is 3% THD, the other 
0.4% THD.

But who knows, for $3.95 it could be fun at least and 
might well be better than Happy Harry's nemesis, the BBD.

If you get one and play with it, I for one would like to
hear about your discoveries with it.

Scott Bernardi <sbernardi at attbi.com> wrote:
>I came across the PT2935 (Princeton Technology) digital echo IC at
>Jameco (www.jameco.com) for $3.95.  The delay can be continuously
>variable with a resistor. You can supposedly get up to 800msec of delay
>with an external 256k DRAM chip in extended delay mode. There was a very
>minimal datasheet on the Jameco page. I got to the manufacturer's
>website yesterday but today it seems to be down (www.princeton.com.tw).
>Anybody have any experience with this chip?  It looks pretty
>interesting, and it's cheap enough.
>
>--
>Scott Bernardi
>sbernardi at attbi.com
>
>
>

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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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