>Why don't you simply use the sleep command? It uses only a few ľA.That's the way we do it in all are batery powered >devices. > Alias DarkBob The problem is I have several op-amps in the same circuit and I need to turn all off. Regards, Octavio ====================================================== Octavio Nogueira - e-mail: nogueira@mandic.com.br http://www.geocities.com/~oct_nogueira "ProPic" Production PIC Programmer Windows under US$20 ======================================================