Original poster: "colin.heath4 by way of Terry Fritz <twftesla-at-qwest-dot-net>" <colin.heath4-at-ntlworld-dot-com> what sort of value in uH should i use for my tesla coil it will be running 7500v 100ma i currently use 10 uH is this ok also would an isolation transformer stop voltage spikes going back into my house wiring? i dont think so but other more experianced people might know different