[sdiy] website update - VC-Delay

[Nils Pipenbrinck]

Ryan Williams wrote:

> I've just got my VC-Echo/Delay module finished. well not in a front 
> panel yet but its working properly. This circuit uses the PT2395. 
> check the page for more info, schematics, sound and a bad picture:
>

I always have an open eye for these PT23xx delay circuits. The minimal 
delay time is a problem for me though. I'm not interested in delay but 
modulation (chorus, flanging and the like).

Ryan's circuit made me think.... I doubt that the delay chip does any 
complicated acesses to the ram: Most probably it just alternates between 
write a byte and read a byte.. maybe even with a fixed address offset or 
no offset at all.

If we would ignore the internal address-logic of the chip and roll our 
own we could make the delay time as small as we would like to, right? 
Can't be that complicated. I doubt we'll need much more than some 
counters and a binary adder.

So, does anyone knows the ram access pattern of the PT2395? 

  Nils