> On 3/30/2010 6:29 PM, ivp wrote: > > Hi all, > > > > Help > You are exceeding the common-mode range of the opamp by having 10v/2 going into each input. Cheerful regards, Bob -- http://www.fastmail.fm - A no graphics, no pop-ups email service -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist