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RE: MMC voltage ratings



Original poster: "Stolz, Mark by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Mark.Stolz-at-st-systems-dot-com>

Hi Jonathan,

When I made my MMC, I went with strings of 15 just to make sure.  *I* would
rather overrate them then have to buy more(it's hard being poor :-)).

I mounted mine on 1/4" plexi, which gives me the ability to add boards in
.01 uf increments.  If you want to see the boards here is a link to my page.
http://users2.ev1-dot-net/~nmyreality/tesla/tesla.htm

>From what I can tell when running two 15/60s, the .02 is close enough to
resonant.

Hope this helps,

Mark Stolz
G-2 #1049
Houston, TX


>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
>
>