> I understand it I need 2 voltage sources: one is stable and the
> other is the battery I monitor. ??????

I was looking at one yesterday I might make up to protect my
sealed leads from being under-voltage. It uses an LM336-2.5
as the comparator reference

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads