You did not mention this before.still it does not work
pulse voltage = 0.7v
This makes me assume you used a DVM to measure this voltages.this gate voltage Vgs = 2.5vdc
Then just tell what you expect.yes i measured it with DVM, but unfortunately i have no scope. i didn't understand why Vgs = 0.7v when Vcc = 21vdc.
This explains a lot. Operating a flyback transformer with no air gap is a safe way to saturate the core.but there is no air gap in transformer due to the total numbers of turns.
It's not clear where your arrows point to..this air gap of transformer as shown in the image ?
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