At 09:29 AM 6/21/2004, Harold Hallikainen wrote: >I have not read the whole thread, so excuse me if I'm suggesting something >that's already been suggested. The message I just read suggested voltage >dividers from each side of a current sense resistor down to a differential >amplifier. The original poster has a resistor in the ground leg of the battery. He wants to measure current into or out of the battery. Seems like a simple problem - all he needs is a way to offset the op-amp he is using to amplify that low bipolar voltage into a higher level voltage without needing a negative supply rail. In other words, a simple gain plus offset op-amp stage. dwayne -- Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 20 years of Engineering Innovation (1984 - 2004) .-. .-. .-. .-. .-. .-. .-. .-. .-. .- `-' `-' `-' `-' `-' `-' `-' `-' `-' Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.