On Sun, 3 Nov 2002, Jinx wrote: *>LM317 adj current is only 50-60uA for 10mA < Iout < Imax Wherever you get that. LM317 adj current is exactly 120uA no matter what the load. That's how it comes to set the voltage by using just a resistor. Constant current across a resistor == constant voltage == regulation. There is only the 1.2V constant voltage between ADJ and Out to be added to this. Peter -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads