set up the meyer / naudin circuit again. this time using distilled water without further insulation, capacity is fairly good though. 300-500V peak come out of the transformer, works fine.
the problem is again, no voltage at the cap (not more than 2.4V of that 500V peak!), even at relatively low 20kHz. used a 3,6k resistor in series for charging the cap and also reducing current further. current on the high side is then around 90mA (measured without rms meter so not necessarily correct).
this has got to work somehow, the other problem is that if i replace the wfc with a real capacitor it doesn't charge to 2*Upeak like it should, i don't know what i'm doing wrong.