[sdiy] dsPICs with DACs: linearizing the 12 bit ADCs, external RAM?

[Antti Huovilainen]

On Sun, 6 Jul 2008, Robin Whittle wrote:

> I tried to figure out how to connect external RAM to one of these 28
> pin DIP devices -  to do reverb, delays etc. beyond the limits of
> the internal RAM.

If you downsample the delay/reverb path, you can get up to 0.5 sec delay 
(at 16 kHz which should be fine for guitar for example) or a semi-decent 
reverb (at 24 kHz). As part of the project I mentioned earlier, I designed 
a reverb using only 4 kilowords of ram. 8 kwords is plenty for quite a 
few things.

Antti

"No boom today. Boom tomorrow. There's always a boom tomorrow"
   -- Lt. Cmdr. Ivanova