[TCML] RE: Tesla Digest, Vol 2, Issue 62

[NICK H <edgarsbat@xxxxxxxxxxx>]

I run 6 strings of 15 CDE 942C's on a 25KVA pig ballasted to approximately 10KVA (stick welder with output shorted, set to run with a supply-side current of 40 Amps at 240vac). It's run for a long time on many occasions without trouble, and certainly lasted many times longer than the cheapie used maxwells' I tried before already. The new MMC, including the plexiglass structure I built to house it, only cost $80 more than 2 maxwells that had equivalent capacitance and voltage ratings when connected in parallel. So far, it's been the best performing cap I've used for coiling, hitting 10' arcs on multiple occasions. 
 
(this one is not a good picture of anything except you can see the MMC pretty well. )http://picasaweb.google.com/calumet45/TeslaCoilJuly012007/photo#5082551420068207586
 
(this one shows the newer fiberglass toroid, and better output, but you can't see the MMC because the light from the spark gap was in view of the camera)
http://picasaweb.google.com/calumet45/TeslaCoil1132007/photo#5129700718416447810
> Date: Tue, 11 Dec 2007 21:18:16 -0700> From: "S&JY" <youngs@xxxxxxxxx>> Subject: RE: [TCML] MMC Caps> To: "'Tesla Coil Mailing List'" <tesla@xxxxxxxxxx>> Message-ID: <000001c83c76$0c8e29b0$0201a8c0@wsueea7ea2de97>> Content-Type: text/plain; charset="us-ascii"> > David,> > The problem with MMCs is not that they cannot be built robust enough. You> can always build an array of caps that can handle both the rms current and> the peak voltage. Rather, it is a matter of cost, and secondarily the> amount of labor you are willing to do to build huge MMC arrays. At some> point, it is becomes cheaper to buy commercial pulse cap(s). But some> people get great satisfaction from building as much of their coil as> possible, including the tank cap, even though it might cost more than a> commercial cap.> > Another point to consider is if you blow up a commercial cap, you have shot> your wad. On the other hand, MMC cap failures usually can be repaired by> replacing some or all of a series string of the caps.> > A final point is that MMCs usually are made with new caps that have not> sacrificed any of their life yet. On the other hand, commercial caps are> often purchased second-hand, and there typically is no way to know if they> have been abused and are near the end of their useful life. As with MMCs,> it is best to allow a lot of voltage and current margin with used commercial> caps, which adds to the cost.> > Personally, I have had good experience (no failures) with an MMC array of 96> caps running up to 3.3 KVA.> --Steve Y.> 
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