I SEEM to recall seeing somewhere a low dropout regulator that had two inputs so you could connect one to a battery and the other to a wall wart. I can't find it now. I'd like to avoid adding diode drops in front of the regulator to get a bit more battery life. Anyone remember seeing such a regulator? THANKS! Harold -- FCC Rules Online at http://www.hallikainen.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads