http://www.geocities.com/CapeCanaveral/Lab/5322/coildrv.htm
i put this together last year and it worked great... except i ended up converting the driver circuit, minus the power transistor, for use as a variable led flasher, and modifying capacitor values....
annyways.. it workeds great, i was able to pull 1 inch sparks no problem
another high voltage source is tv's/ monitors... you just open teh case, dissconnect the high voltage line and put a ground near the high voltage posative, and Woosh..itl suck up those electroncs in giant sparks...(yes the high voltage is "sucking" the elctrons from the earth...negative partical theory at work there...most people are confused with that and think electricity froms from posative to negative. its is only the posative holes that move, or the location of the posative Ion in the conducting material... confuse you yet?
annyways, just rember the one hand rule... one hand!!! cause if ya accidentaly cross that hig voltage leade across ur arms, throu ur chest... ur toast.. well.. kinda... ur dead in the least.
and if the propane take explodes... uggg...
you might want to use a large, long peice of rubber tubing to move the take asa far away as possible, and install a mesh so it wont explode the tank....
uhm...
if u get hurt its not my fault that ur ignorant of the dangers of electricity!!!!