I have recently completed an tested a bi-polar tesla coil. It didnt really take very long to complete, so I figured I'd post a photo instructable about it. Its powered by a 12kv 30ma NST, with 6 yoohoo bottle capacitors. I actually had some complecations when iI tried it out for the first time. The secondary is a 1-1/2 inch diameter piece of PVC pipe, an the primary was wound on a 2 inch PVC pipe coupling. Well it turns out that thesecondary was close enough to the primary to arc to it, an it caught it on fire in one place,lol. So I wound the primary on a 4 inch PVC pipe coupling, an that solved the problem. So now it works great, well in my opinion,lol. Im pretty proud of it, so tell me what you think.