Re: BetterCapacitors

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

Original poster: "Daniel McCauley by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>

i have a 0.0275uF, 24kV MMC on sale now at ebay.  Uses (12) 0.33uF, 2000V
Caps.
Dan

http://cgi.ebay-dot-com/ws/eBayISAPI.dll?ViewItem&item=1753141077

Daniel McCauley
Space Cat Advanced Lighting Systems
www.spacecatlighting-dot-com


----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, July 28, 2002 3:04 PM
Subject: Re: BetterCapacitors


> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>
> Hi Chris,
>
> At 11:02 AM 7/28/2002 -0500, you wrote:
> >
> >A MMC would be the best solution.In terms of size and weight... but I
have
> >no data to support this conclusion just your guys recomendations....
>
> Everyone gets MMC now days or goes for the cheap salt water caps.  The
geek
> group has a nice plan for a real good salt water cap and they also sell
> nice MMC caps cheap.
>
> www.thegeekgroup-dot-org
> http://geekgroup.yi-dot-org:81/
>
> Looks like they are working on their site right now...  Give it a few
> days...  Maybe write Chris...
>
> >
> >so I need some opinions on a couple things
> >
> >Is it worth it to route out a source for the thick 30mil PE plastic
sheeting
> >???
> >whats an average cost of a 15-20nf rolled cap?
>
> I can't think of anyone who has made a rolled cap in a year or so now.
> When MMCs hit the scene, a number of people dropped their rolled cap
> projects right in the middle and made MMCs instead.  I think an MMC is
like
> 1/4 the cost and 1/10th the effort...
>
> >
> >Whats the best source for mini caps... The geek group?
>
> Yep.  They have 0.15uF 2000V polypropylene foil caps (Cornell Dubilier
> 942C20P15K) for about $3.50 each (not sure of price?).
>
> http://hot-streamer-dot-com/TeslaCoils/MMCInfo/GeekCaps/GeekCaps.htm
>
> >whats the recomended ratings for caps not from the geek group?
>
> Polypropylene-foil construction, high-current high-voltage self-healing...
> See the list at:
>
> http://hot-streamer-dot-com/TeslaCoils/MMCInfo/good-bad.txt
>
> >when is the next geek group order going through?
>
> Ask Chris :-)
>
> "Christopher Boden" <chrisboden-at-hotmail-dot-com>
>
> >
> >anyone have a guess at much would it cost me in resistors and capacitors
> >from the geeks to build a 15nf to 20nf MMC?
>
> See this chart:
>
> http://hot-streamer-dot-com/temp/MMCcapSales.gif
>
> >Where is a good page to get the math for doing up a MMC?
>
> http://hot-streamer-dot-com/TeslaCoils/MMCInfo/mmcinfo.htm
> http://hot-streamer-dot-com/TeslaCoils/MMCInfo/MMCPower4.html
> http://hot-streamer-dot-com/TeslaCoils/programs/Mmccalc2.zip
>
> >What type of resistors do I need to use?
>
> "I" just get 10Meg ohm 1/2 carbon film types.  Yageo 10MH
>
>
http://www.digikey-dot-com/scripts/us/dksus.dll?Criteria?Ref=88368&Cat=30802464
>
> They are used over they're voltage rating but they work fine.  I have a
few
> thousand extra so write me and I'll send you a bunch for free.
> terrellf-at-qwest-dot-net
>
> >Say I built a MMC to go with a NST 12kv60ma, if I buy another NST can I
just
> >build another MMC and paralel it in with the other one? Or do I need to
> >reconstruct the entire unit?
>
> You just simply parallel it up.
>
> >
> >I can probably figure out a lot of this if someone points me to the right
> >information, but I would really like the current opinions on capacitors.
a
> >little help with the math wouldnt hurt either.....
>
> http://hot-streamer-dot-com/TeslaCoils/MMCInfo/mmcinfo.htm
>
> See the little DOS program at:
>
> http://hot-streamer-dot-com/TeslaCoils/programs/Mmccalc2.zip
>
> Also a Excel spreadsheet form too.
>
> http://hot-streamer-dot-com/temp/MMCcalc2xls.zip
>
> The thermal dissipation value for these caps that MMCalc2 asks for should
> be "22".
>
> However, Mark Broker's chart at:
>
> http://hot-streamer-dot-com/temp/MMCcapSales.gif
>
> already has everything figured out for normal coil configurations.
>
> >My salties are tough and work but I hate moving the big heavy darm
things...
> >
> >I have been wondering has anyone ever built a primary on one of those
round
> >plastic sleds?
>
> Sounds like a great idea!
>
> Cheers,
>
> Terry
>
> >
> >Thanks
> >Chris Dowdy
> >
>
>
>
>