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Since the rate of change in current in the primary coil will produce voltage at the second coil, I think its clear that we need to use a resistance with low value in series with the coil. Isnt that true?
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The maximum I/O current and voltage of the FPGA have to be kept, this sets a lower limit to the series resistor. External transistors or drivers/power amplifiers should be used, if higher currents are needed.
As said, the highest output level will be achieved with a resonant circuits at both sides and no load at the secondary.
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