> Its when there is a large differential and the supplies (and return paths
> to ground) are long, then you start having problems

A project I spent an awful lot of time getting right has been completely
fudged up at the remote installation. The symptoms they reported to me
just didn't make sense compared with the faultless performance here

So I got *their* whole thing back yesterday. Ay caramba. Not a common
ground in sight. I measure 0.8V and 150mA between section grounds. No
wonder it trips whenever a light or a motor is turned on or something is
(dis)connected or anyone looks at it funny
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist