Original poster: sean <sean-at-nc.rr-dot-com> Hi, I have been using WinTesla for calculations, It seems pretty accurate. It calculates the size of my Primary capacitor based on the transformer I have been using. My question is, how does it do this, and what is "larger than resonance" capacitance. How do I calculate this, and what is it? Thanks. -- sean <sean-at-nc.rr-dot-com>