With only 15 turns on the primary and a 70 percent duty cycle, the problem might be lack of impedance and it could be a power supply droop because the transformer looks alot like a short circuit. This could exacerbate the minor electrostatic coupling that exists when the meter is attached. Keep smiling, it could always be worse. Art -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body