V G wrote: > I was thinking of doing high side current sensing like the first > diagram > here: http://i.cmpnet.com/planetanalog/2009/02/C0363-Figure1.gif One of those diagrams shows a high side current sense, but neither is showing active control of the current. You can trade off complexity in the current sense versus the current control, but either way there isn't a free lunch. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .