[sdiy] modern AD/DA chips?

[Antti Huovilainen]

On Wed, 6 May 2009, Seb Francis wrote:

> Like this for example:
>
> http://burnit.co.uk/sdiy/index.php?page=fatcontroller&subpage=schematic
>
> Uses a 14bit serial DAC, 0.5-1 LSB INL depending on grade.  Overall accuracy 
> ...
> Not cheap, but then again they have a nice 'Sample' button....

A cheaper and very simple, but possibly "good enough", version could be 
built using some 8bit pic, MCP4821, 4051 mux and a bunch of low offset S&H 
opamps (LF412 or similar).

The main problems would be limited range (5 oct with 1.5 cent resolution), 
not quite reaching the lowest and highest notes exactly and trimming the 
output to exact gain (assumes you have high accuracy voltmeter).

It should still beat Paia midi2cv easily.

Antti

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