You question was a little short on detail but maybe a look at http://www.breakfix.demon.co.uk/tesla_cap1.html might help you. Steve Bell (UK) steve-at-breakfix.demon.co.uk http://www.breakfix.demon.co.uk > Original Poster: Thomas Gstrein <thomas.gstrein-at-stwimst.at> > > Hello. How can I calculate a capacitor? > >