----- Original Message ----- From: "Michael Rigby-Jones" To: "Microcontroller discussion list - Public." Sent: Friday, January 06, 2006 6:00 PM Subject: RE: [EE] Sealed Lead Acid charger~~ | How about MOSFETs on the output of the regulator to disconnect it from the battery when no input voltage is present? Something with a nice low Rds(on) should (in my head at least!) cause minimal regulation impairment compared to a diode. Or even, *shock horror*, a good old electro-mechanical relay? | | How about the old LM723, cheap with built in current limiting, through will need an external pass transistor for the kind of currents you require. How about a simple, dedicated IC like the Philips TEA1102? There is a PCB in the documentation, switchable for NiCd, NiMh, LiIon and SLA (from .5C to 5C)... and it's cheap... If you don't find the data sheet I can send it... regards Enrico -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist