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MMC voltage ratings



Original poster: "Jonathan Peakall by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jpeakall-at-mcn-dot-org>

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