In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Dunnsept wrote:

nah.. I'm just getting started building them. I have a new video of it to upload, but forgot the tape.
for measuring the current, I was looking at one of the maxim high side current-sense ICs. Analog makes some too. both output a voltage proportional to the sensed current.
the output of this will drive a TI mosfet driver, driving  of course, a mosfet. when the input frequency matches the resonant frequency of the coil, current is at it's highest because inductive and capacitive reactance is at a minimum and the coil is seen as (almost) a purely resistive load

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