RE: [TCML] MMC Caps

["S&JY" <youngs@xxxxxxxxx>]

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.

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of david baehr
Sent: Tuesday, December 11, 2007 4:58 PM
To: Tesla Coil Mailing List
Subject: RE: [TCML] MMC Caps


Hi,
           OK,   is it your opinion I should stay away from MMC's  with a
14400/3kw  baby pig system , and stick with my Ol'  poly TCBOR rolled caps ?
 
                            a friend of mine recently made an mmc to use on
his future 5kw + system ,   bad idea ??
                                 Thanks,dave
 
> From: resonance@xxxxxxxxxxxx> To: tesla@xxxxxxxxxx> Subject: Re: [TCML]
MMC Caps> Date: Tue, 11 Dec 2007 15:35:31 -0700> CC: > > > > If you are
running a NST then use MMC caps. If running a pole xmfr, DO NOT > use MMCs.
You would be pushing them. > > Dr. Resonance> > > 
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