Improved induction heater
This heater is identical to my last one, but with more tank capacitors: 3 strings of 3x 1uF 1000V film/foil caps. The work coil is also made out of copper brake pipe instead of wire. I tried annealing the pipe over the gas cooker to make it easier to bend but it never made much difference, the flame wasn't hot enough.
The project came to an end when one of the MOSFET gate leads came loose. (I was actually using the bridge to drive a flyback at the time.) This caused the MOSFET to turn partly on and the resulting high dissipation destroyed it. Because of the Ghetto construction, when I tried to replace it the whole H-bridge fell to bits.
I'm now looking for some suitable high-current capacitors to build an even bigger induction heater.
