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Re: MMC take2

Chris

That pulse cap sounds way too big - the capacitance would be too high -
but it's a lovely (but dangerous) beast for other applications. You
should save it until you can recitfy your PSU and charge the thing up for
use in can-cruushing, exploding wire experiments, etc - but leave this
until you've had some experience with your Tesla coil as any contact with
such a huge amount of stored energy will surely kill you and probably
forcibly blow off arms and legs. Check out The Arcstarter's web site for
info on his pulse discharge experiments - but bear in mind that this guy
is even madder than the rest of us!

Again, get WinTesla which will tell you what cap size you need to match
your Xfrmr and how this will tune with your primary coil.

As for MMCs, I think that about 3 or four people so far on the list have
built and used them - so far, fingers crossed, without a failure. You may
want to look at Gary Lau's webpage - his details are quite comprehensive.
Capacitors made by Wima, Evox Rifa and Philips have all been used.
Although these are all operating quite a bit outside many of their
ratings, it seems that the low duty cycle in Tesla work may help them
survive.

Alex



Tesla List wrote:

> Original Poster: "christopher boden" <chrisboden-at-hotmail-dot-com>
>
> >From: Tesla List <tesla-at-pupman-dot-com>
> >To: tesla-at-pupman-dot-com
> >Subject: Re: MMC take2
> >Date: Thu, 22 Apr 1999 22:14:50 -0600
> >
> >Original Poster: Adam <psycho-at-tradewind-dot-net>
> >
> >
> >
> >Tesla List wrote:
> >
> >> Original Poster: "christopher boden" <chrisboden-at-hotmail-dot-com>
> >>
> >> Alright as I understand it someone recently took a whole bunch of
> >> little caps and hooked them together for TC duty. They called it
> the
> >> MMC (Another obscure acronym?) i think.
> >>  I have a resource for a whole herd of brand new computer grade
> caps.
> >> The values are 1399mFd -at- 450 VDC, how many do I need? I can
> probably
> >> get a couple hundred. Any ideas?
> >>
> >
> >MMC is Multi-Mini Cap, as in a capacitor made from many smaller
> >(commercial) capacitors.  The safest procedure for finding the
> number of
> >capacitors is to check out the manufacturer's data sheets, and
> derate the
> >caps for the frequency of AC your tank circuit will resonate at.
> Then
> >see how many caps in series you'll need for that, find the
> equivalence of
> >that string of caps using the standard formulas, and then calculate
> how
> >many strings you'll need to achieve the required capacitance, using
> the
> >standard formulas (math.txt).  Play with the numbers a little to get
> >everything right.
> >
> >Those caps have a pretty hefty capacitance for this kind of work,
> though,
> >and I don't think they'll be able to handle the intense labor
> involved in
> >the capacitor sweatshop that is the Tesla Coil.  Be sure to check out
> >what kinds of AC frequencies these things are meant to handle, as
> well as
> >the magnitude of the current that they're built to deal with.  Taking
> >chances with this stuff caan be frustrating,dangerous, and even
> (gasp)
> >costly, especially in such a new area.
> >
> >Playing the conservative yet again, I'd suggest that you use a cap
> >designed for "pulse applications," but hey, who knows what you might
> >discover.
> >
> >Good luck,
> >Adam
> >
>
> The only pulse cap I can get Cheaply (and that is a reletive term) is
> a 300 pound monolith with 3.3KJoules at 60KV...will that work? Or
> should I go with the MMC.
> I've heard good things about the whole MMC project. Is it still
> funtional? What's the latest?
>
> The Coronaphile
> Christopher A. Boden
> The Geek Group
> 344 Ionia SW
> Grand Rapids MI
> 49503
> (616)-574-4065
>
> The Geek Shall Inherit the Earth!
>
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