I don't have my original reference handy, but experience across millions of= relays confirmed this, less problems where we used Zener suppression than = where we used the conventional diode suppression. This was driving small AC motors for draperies. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .