>>I have but I can't use it. The supply varies between about 6 and >>40V. >>Aren't there Shottky bridge rectifiers (small, inexpensive ?) Be careful of voltage ratings with Schottky. They tend to be lower than most and quite sensitive (magic smoke wise) to rated voltages being exceeded. RM -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist