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I found this circuit in a 20 year old, out of print, Strictly Internal Combustion magazine. I have not built it yet but if I understand what I'm reading sparks start 2 msec after the points or wiper makes contact and then continues for 5 msec. Slight timing adjustment will need to be made for the 2 msec delay. The 5 msec duration should save the battery if the engine stops with the points or hall sensor closed. With points A and B terminals are used. With hall sensor A, B and C terminals are used. I believe it works with most any standard ignition coil. There were corrections made to this circuit in two following issues and I've shown the circuit with the latest changes.
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