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RE: Capacitor Help Needed



Original poster: "david baehr" <dfb25@xxxxxxxxxxx>


Yes, the mmc is the way to go , but rolled caps can be used with good results if made robust, I made mine around 1992 or so, with ony a couple of failures , that, were repaired without too much grief ,....they are still in use..........





>From: "Tesla list" <tesla@xxxxxxxxxx> >To: tesla@xxxxxxxxxx >Subject: Capacitor Help Needed >Date: Tue, 19 Jul 2005 17:59:40 -0600 > >Original poster: "Wilson Ng" <metalstorm2002@xxxxxxxxxxx> > > > > Hello list members. > > I have had bad experience with my capacitors. My first one that >worked okay with my tesla coil was a jellyroll cap made from plastic >baggies and metal foil tape. It works well up to about 3 kv. Beyond >that, there will be smoke and popping sounds. Adding additional >baggies >for the dielectric decreased the capacitance dramatically. Later I >tried MMCs with a string of 30 200v 2uf metalized polyester >capacitors. It was just >a test to see if the setup works. After several seconds, I smelled >smoke even though the test voltage was only 3kv! I've also tried >foil wrapped bottle caps but it was messy and one bottle cracked. >UGGHH! > > After sorting a while through the pupman archives, I was unable >to find anything other than glass bottle caps, MMCs, and homemade >plate caps. These caps have downsides: > > MMCs - expensive > bottle caps - messy and lossy > plastic/plate caps - a pain in the ass to make and not very > reliable > rolled caps - not reliable > Microwave cap MMC - possibility of explosion > >My question is, is there another way to make a reliable, >cheap, and effective cap without breaking my bank? > >