On Sun, 13 Feb 2005, Jinx wrote:

>> For what its worth, I'd suggest deriving the bias voltage from the
>> regulated 5V supply instead of the battery
>
> For that matter you could generate V+ for the op-amp with the
> PWM module

Afaik the TL081 does not include gnd in either input cmmr or output. 
Interfacing it with a logic chip is problematic.

Peter
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist