A Royer oscillator with 2 IRF540 N-Channel mosfets, a 0.47uF Capacitor and a 1500uH inductor used for an induction heater.
The mosfets remain cool, even with such small heatsinks.
An isolation transformer was used for the first test with a work coil of 20turns, then the transformer was removed and a work coil of 7+7 turns connected directly to the oscillator.

Here are the schematics for the two variants:

Construction is easy: small heatsinks for the mosfets and 12V regulator, capacitor close to mosfets and coil, tick wire in the work coil. For any other questions, use the comments form below.

The 2000uH ferrite inductor closeups:

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