> I seem to have (mysteriously) deleted the post which mentioned assuming that > an auto ignition coil uses usual turns ratio assumptions. As you were. Brain fade strikes. That's what comes of copying a thread to a second list !!! Messages were (and are) in another folder. Russell McMahon -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu