> But in this instance, the resultant error would > hardly be greater > than 1 bit on a 10 bit ADC - but then I have not worked > through the math of > the input bias current of an LM324 I would be more worried about the offset voltage. Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body