But the TPU uses ferrite cores in all models, even in the one that looks as though it does not, Peter found it, a small CMC which I have the same one. each coil has 29mH and if wired to buck together the inductance nearly cancels at 0.5mH, but wired so as not to buck the inductance is X4 at 116mH. This seems to only happen when wound together on the same ferrite, but if they are an air coil the inductance only adds simply, X2, and not X4. Now if you mix charge displacement current between two magnetic loops which have a capacitive connection, current can be induced into a voltage boost, overwound, scenario which is in phase with the boosted voltage, you don't need much if looped somehow as even at 50kHz the power will escalate out of control. (boost circuits and class E amplifiers are between 90-100% efficient) Regards Mike
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