MOSFET Shield Frequency Errors with Multiple Signal Frequencies

[PerryBebbington]

@Smajdalf

Where the high voltage spike comes from? It should be on the OTHER side of the inductor.

Have you read this: Flyback diodes and why you need them
300V possibly more, that will go all over the place and I don't think you can assume it will stay in one place, going to kill something!