wzab wrote: > I need to add simple amplifier to my digital system which is powered > from a single 5V battery. > To achieve proper operation of the operational amplifier I need at > least +8V and -8V voltages. Why not use a amplifier that works on 0-5V? ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist