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My ZVS driver gets very hot on one Mosfet only

Guest arkon666

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Guest arkon666

Hi all, Can anyone help me please. I've built the ZVS driver from this page here http://www.electronics-lab.com/forum/index.php?topic=19386.0
and it sort of works BUT. One mosfet gets very hot and the other one doesn't. Any ideas why? Is this what it's supposed to do?
I've not used the IRFP240 or 50 but 2 x FDA59N30

Also currently I have no secondary on the flyback, just the 2 x 5 turns of wire on the primary side.

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