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Old January 17, 2017, 06:49 PM   #147
Join Date: March 4, 2005
Location: Ohio
Posts: 16,718

The original frustration may be due to the core material. You may have got too much inductance from it and choked current flow into the tank circuit too much to get adequate energy from it. The main symptom would be the frequency being detuned too far. That, alone, may prevent it from heating thin metal as well as you want, even when it is coupling energy into it.

You can adjust the inductance down by spreading the coils out over more length of the inductor, reducing the number of turns, or wrapping the core with paper or something to create space between the coil and the ferrite.

The right material should be for your frequency range. It also needs to be thick enough to produce the magnetic flux density you want before it gets too close to saturation. It should not produce a lot of heat loss at your desired frequency.
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