Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Fucian-at-aol-dot-com> Hi, I was wondering if anyone out there knows about blocking counter electromotive force.Its not for a tesla coil but for a SCR.Im dumping about 450 volts through a flat spiral and it pulls about 500 amps instantaneous.So when the feild collpses, it comes back to the SCR. matt