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Ive ordered some low value 2w metal film resistors and will experiment with coil current and frequency as eric mentioned in his posting.
The 200v mosfet seems to be ok now if i leave the supply voltage at 12 volts even though the back emf is still 250v but the mosfet is running cool and i left it on test for several hours and the depth is still the same...with smooth threshold and hardly any external noise present.
The 200v mosfet seems to be ok now if i leave the supply voltage at 12 volts even though the back emf is still 250v but the mosfet is running cool and i left it on test for several hours and the depth is still the same...with smooth threshold and hardly any external noise present.
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