[sdiy] Digital echo chip

[Paul Maddox]

Scott,

> 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.

Not played with this..
a couple of weekends ago I built my own DDL :-)
(I was bored one sunday)

Its 12 Bit, 44Khz, and can delay by 800 mseconds, oh and its stereo out
(though currently it just does mono)
Ive not hooked up the CV control yet, but it shoudln't take much work..
It have CV control for delay on left chanel and delay on right channel..

I used a MAXIM MAX120 (ADC), and AD DAC(AD7396), with some  55257 SRAM chips
(you can double the memory if you shoudl want to get a 1.5second delay and
an Atmel 8535 running as the controller (and soon ADC for delay times)

once complete (if people want) I'll put some details onto my webpage.

Paul
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