>> ubiquitous capacitive-type current limiter ... I know you know BUT such circuits must be treated as if they have live mains at all points at all times - as they can have. Fully protected against intrusion is a minimum and graphically labelled for the unknown future repairer is good. Perhaps may not meet regulatory requirements in some cases? Russell --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .