Here's a homebuilt ignition driver circuit designed by Dave Sage and I. It's driving a miniature coil by J.E. Howell and an NGK plug from some random piece of power equipment. The gap was opened up to make the spark larger and easier to video.

It uses a Fairchild EcoSpark IGBT (ISL9V3040) as the output driver. The second driver serves as drive for the IGBT. The device connected to the terminal strip is a hall effect sensor. When a magnet passes by, it triggers the hall sensor which in turn triggers the coil.

The engine on which this will be used has a magnet on the camshaft gear which triggers the spark.

This circuit is unique in that if the engine is stopped with the magnet positioned in front of the hall sensor, it will not keep the coil powered. In other words, it automatically shuts off. This is to save battery power as well as to avoid excessively heating up the coil.

All is being powered from 4 AA cells in the battery holder.

The schematic can be found here: [ Ссылка ]

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