Hi People, IMO, actually, we have, at least, 3 solutions: Simple "Parametric" stuff: 1) Charging 2 caps in // and discharging them in series... A very old idea. Kinda "Tesla Switch". Claimed to be working by some people and useless for others. More elaborated "Parametric" stuff: 2) Charging 2 caps in // via a coil and discharging them in series... A less old idea. "Double Parametric" stuff, a more 'tortuous' idea: 3) You energize 2 coils while they are in the 'few Henries' configration. Then, you let them giving back their NRG to the two caps (in //) when these 2 coils are in the 'lot of Henries configutation'. In the attached picture: 0.45 mH versus 227 mH one. V = L.di/dt + i.dL/dt. No? The CCT is much more complicated indeed. But worth to be though about, IMO. NO? A real measurement of one of my bifilar coil:  All the Best from Brest, Jean
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