Re: Thought on MMCs...

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

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

Hi Justin,

MMCCalc displays the current in the far right.

http://hot-streamer-dot-com/TeslaCoils/programs/Mmccalc2.zip

It will tell you how may caps adn teh number of rows and string you need.
It is bassed off the equations in:

http://hot-streamer-dot-com/TeslaCoils/MMCInfo/MMCPower4.html

A post on this is found with Chip's great new Google search engine of old
posts at www.pupman-dot-com (I never write these things down :-))

http://www.pupman-dot-com/listarchives/2000/September/msg00552.html

The geeks caps can take 13 amps RMS at 22 degrees / watt.

Cheers,

	Terry



At 03:30 AM 7/22/2001 -0400, you wrote:

>Anyhow, I do have a quick question about MMC's (kindof): How do you calculate 
>the RMS current put through a given Tesla coil tank capacitor? Can someone 
>point me to a formula? 
>
>With that, I suppose you could then find the number of strings you'd need in 
>an MMC for a decent life expectancy. Just add strings (and currents) to get 
>the required current handling capability you need for a given Tesla coil.
>
>Man o man, I'm wondering what kind of current rating we'll need for our next 
>coil.
>
>A 20kVA twin, 12" twin secondaries, .5" copper primaries, srsg (which I 
>worked on for 8 hrs today...my hands are covered in epoxy!), 2 big 
>chicken-wire covered foam toroids. (like Bert Pool's Warthog coil), and a 
>.05uF MMC cap. We have the pig, current limiting, 2 coilforms, primary 
>copper, and almost SRSG.
>
>We expect 20 foot arcs, probably more. The capacitor is the hard part for us 
>here. Good thing about a twin, is that you only need HALF the tank 
>capacitance ('cause theres 2 primarys in series)...........which means HALF 
>the cost basically.......but we're not sure how to design this thing. We 
>definately want to go MMC --- but only 5 strings of the geek's caps for 
>.05uF(or so)?? Thats just asking for it as far as the RMS current goes right? 
>I mean, 20kVA into a MMC with only 5 strings. I'd appreciate thoughts 
>here.......
>
>Hmm....rethinking things.....maybe I'd have to make the thing huge. Is that 
>the simple answer?! Add more caps per string to keep capacitance the same, 
>and increase strings for more current. $$ right?!
>
>Take care Terry, All. What a great list.
>
>Justin Hays
>KC5PNP
>Email: pyrotrons-at-aol-dot-com
>Webpage: www.hvguy-dot-com
>