> LT1678 might work for you, assuming you're using it as an op-amp and > not as a comparator. Yes, as a differential op-amp actually. The only scarry thing about your suggestion is the price. Is there a cheaper alternative or almost all rail-to-rail op-amps are this expensive ? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .