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This is an interesting concept that may not be available in all areas; http://www.generlink.com/about_generlink.cfm
Interestingly the old ignition coils were independent of turns ratio and input voltage. The coil core was saturated by the primary current and when the points opened the collapse of the magnetic field and the number of turns in the secondary resulted in the high voltage. The capacitor was to prevent the back emf on the primary side from arcing across the points.