Re: MMC

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mike Kiser by way of Terry Fritz <twftesla-at-qwest-dot-net>" <cli-at-bluemarble-dot-net>

Hello,

This is slightly off topic, but about a week ago I tried to post on a similar
topic. I never did see it on the list so I thought I'd try responding to this
one instead.

I have a 4.25" X 25" coil driven by 2 10KV 23mA OBITS (60 Hz) in parallel for
46mA. The cap is an MMC array consisting of 6 strings of 23 caps each that
works
out to .012 mfd and 27KV. According to my calculations (possible errors?) this
is resonant with the OBITS. After burning out 3 OBITS, I am wondering if
running
in LTR mode would be a good idea. I can get .018 mfd and 18KV by removing 4
caps
from each string and using most of them to make a 7th string. Does anybody out
there see disaster lurking in this idea? I'm not an experienced coiler and
would
appreciate any help from those who are.

Thanks,

Mike Kiser

Tesla list wrote:

> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>
> Hi Max,
>
> Are you sure you need 40kV!!  MMCs do not have to be made to take higher
> voltages like old homemade caps were.  Noramlly 20kV would be just fine and
> cost 1/4 as much which would hit your cost target.  What is you peak or 1.4
> x RMS voltage?  that is the voltage you should rate an MMC too.  Any higher
> and your wasting money.  See also:
>
> http://hot-streamer-dot-com/TeslaCoils/MMCInfo/GeekCaps/GeekCaps.htm
> http://hot-streamer-dot-com/TeslaCoils/MMCInfo/mmcinfo.htm
>
> Cheers,
>
>         Terry
>
> At 04:01 PM 5/25/2001 +0000, you wrote:
> >
> >>Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> >><Gbjsjg-at-aol-dot-com>
> >>
> >>I need a really good deal on MMC! I am trying to build a .1 40kv cap for
> >>under $150.
> >>
> >>-Max Joseph
> >
> >Max,
> >
> >That's one MONSTER cap!  Are you sure you didn't mean .01uF, 40kV?
> >
> >The Geek Group can accommodate you, but not for that price.  Using our
> >smaller cap, 2kV, .1uF, you'd need a 20x20 array.  That's 400 caps at $1.80
> >each for a total of $720.  Using our larger cap, you'd need a 20x15 array,
> >or 300 caps at $2.25 each for a total of $675.
> >
> >Our caps are tough little buggers, and so, do not need to be so
> >overdesigned.  Our MMC designed for use with 12kV NSTs is rated for only
> >18kV max.  We've punished it for over a a couple hours of runtime with no
> >problems.
> >
> >Mark Broker (using Chris' email account)
> >G-5 Geek #10
> >
> >
> >_________________________________________________________________
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> >