Re: MMC voltage ratings

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Johanthan,

A 15kV transformer has a peak voltage of 21kV.  10 2000 volt caps give 20kV
which is close enough since MMC caps can easily be pushed somewhat beyond
their ratings without worry.

As Mark's chart at:

http://hot-streamer-dot-com/temp/MMCcapSales.gif

Shows, 2 strings are fine.  The current is about 12 amps which is just at
what they can take without worry.  More info is at:

http://hot-streamer-dot-com/TeslaCoils/MMCInfo/GeekCaps/GeekCaps.htm

I can't speak to the JAVA MMC calculator but is should work.  I can't find
the URL or I would try it.

Cheers,

	Terry


At 08:47 AM 11/20/2001 -0800, you wrote:
>Hi All,
>
>I am making my MMC, and am a little unsure of whether I have an adequate
>voltage rating. The Geek site says this is ok, and the Java MMC calculator
>says the reliability is bad. I must be doing something wrong, as it says all
>my designs are bad, even when I put silly numbers of caps in a string. Could
>y'all weigh in on this one? I want to make a good one that lasts. My specs:
>
>PSU: 15/120, static gap, desired tank cap around .03uf (LTR)
>
>I have 22 caps, .15uf/2000VDC. The Geek site says 2 strings of 10 will be
>ok, this would be .03uf/20kv. Does this have an adequate safety margin?
>
>I could go closer to resonant and get 8 more
>caps, and have 2 strings of 15 for .02uf/30kv. Is .02 close enough to .0212
>(the value listed as resonant) to be resonant?
>
>Once again, as always, thanks much.
>
>Jonathan Peakall
>
>
>
>