Details of this Royer circuit electronic driver for flyback and other coils are here. Here it is used with a 1+1 turn primary on the base of my 18 inch coil.
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It is continuous drive with no attempt at resonance, hence the spark is tiny and ridiculously out of proportion to the TC secondary size. Proof of principle only.
This is the driver used here to drive a microwave oven inverter transformer.
The schematic is below and I have used parts mostly on hand.
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Photo Date: 5/12/04