Original poster: "Nick Andrews by way of Terry Fritz <teslalist@qwest.net>" <nicothefabulous@hotmail.com> Here is an interesting design for a HV spark circuit that is a bit different. http://www.technologie-entwicklung.de/Gasturbines/Bangbox/bangbox.html There is also a link to yet another circuit design program with a free demo version. I have not tested it, but it's free, so... Nick A