$5 digital delay chips

[List, Christopher]

Hey this looks pretty cool, and cheap too! Another feature that might be
cool is the variable sampling rate - to get a lofi sound.

Definitely let us know how it goes. I'd especially be interested in the
minimum value for the delay resistor and the minimum delay time (I
didn't see that given in the datasheet, but I only did a quick scan).
It's too bad they aren't more specific about the kind of roll that
resistor is playing in controlling the internal delay osc. 

- CList


> -----Original Message-----
> From:	Thomas Hudson [SMTP:thudson at cygnus.com]
> Sent:	Monday, December 14, 1998 6:34 AM
> To:	Synth-DIY
> Subject:	$5 digital delay chips
> 
> 
> The was a discussion some time ago about the Holtek HT8955A
> "Voice Echo" chip
> (http://www.holtek.com/docum/Consumer/8955a.htm)
> 
> I was never able to find a price or a source for the chips, so I
> eventually forgot about them. I was flipping through a Tech-
> America catalog this weekend and found them. They sell
> for $5. The catalog number is  900-7548.
> (http://www.techam.com)
> 
> .8 seconds delay at 25khz sampling rate (can go as high as
> 50khz)
> 10bit AD/DA converters.
> 
> Delay time is controlled by a resistor, maybe an LDR or
> OTA could be used to have a voltage controlled delay?
> 
> Add the 4164 DRAM at $1.83, and a handful of resistors
> and caps, and have a VCDD for under $20...
> 
> I bought two of them, I'll post to the list when I try
> them out.
> 
> Thomas