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Aren't you producing loads of RF interference at 400kHz?
When I was a kid, I tied a piece of string to the light switch. This worked because I was quite close to the light switch.Also, it allowed "manual control" of the light switch!
Car windscreens absorb 100% of UV.Have you tried wearing those glasses that automatically darken in bright sunshine - they don't work inside a car!
I would pay some attention to the provision of a safety rope.
Isn't this a modern take on a crystal radio?
It's a lot less bother if you twist & solder but omit the heat shrink tubing.Insulation tape is quite good enough - especially if you are jointing 240V 3-core mains wiring.
Have you got enough machine tools?
What is the reason for burning the centres of the coils?Although Copper Oxide has been used, historically, for semiconductor diodes, it tends to degrade rapidly.
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