Try Bob Parker's design, I've been using one for a number of years, it's available quite cheaply as a high quality kit - you can find the Assembly Manual here .
Bear in mind that these types of testers only find shorted turns, and also work on most coils, not just LOPTX's.
Try Bob Parker's design, I've been using one for a number of years, it's available quite cheaply as a high quality kit - you can find the Assembly Manual here .
Bear in mind that these types of testers only find shorted turns, and also work on most coils, not just LOPTX's.