Re: CD cap MMC

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

Original poster: Mark Broker <mbroker-at-thegeekgroup-dot-org> 

Chris, Terry meant .0214uF, which is resonant for a 15/120 NST on 60Hz 
mains.  Odd recommendation since he helped start the LTR movement....

Richie Burnett has an excellent writeup on capacitor size and resonant rise 
on his website:

http://www.richieburnett.co.uk/tesla.shtml

In a nutshell, LTR values prevent over-voltage due to resonant rise while 
still allowing a maximum bang size at a minimum BPS (maximum power 
through-put).

Cheers!

Mark Broker
Chief Engineer, The Geek Group


On Wed, 08 Oct 2003 19:56:19 -0600, Tesla list <tesla-at-pupman-dot-com> wrote:

>Original poster: "Mudford, Chris" <chris.mudford-at-agresearch.co.nz> Hi Terry
>
>I'm interested in why you are suggesting a less than resonant value, as I 
>too am about to build a new MMC and am looking at what capacitance value I 
>should be aiming for.  I haven't read up on smaller verses larger, verses 
>resonant so excuse me if the answer should be obvious.
>
>Cheers, Chris (NZ)
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Thursday, 9 October 2003 1:43 p.m.
>To: tesla-at-pupman-dot-com
>Subject: Re: CD cap MMC
>
>
>Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>
>
>Hi Kreso,
>
>The peak current for the 940 series 0.15uF 2kV cap you mention is 144 amps
>peak.  The 940 series is not thick metal foil but only thin vacuum
>deposited aluminum that is not good for super high current.
>
>http://www.cde-dot-com/film/9402000.htm
>
>Our favorite 942 series caps (942C20P15K) use full metal foil for 432 amps
>peak.
>
>http://www.cde-dot-com/film/9422000.htm
>
>You want the 942 series 942C20P15K for sure!  Some people have gone with
>the 940 series ok, but sometimes they fail too...  It all depends on how
>your coil is set up.
>
>The chart at:
>
>http://hot-streamer-dot-com/temp/MMCcapSales.gif
>
>Tells how many you need.  I am not sure what your line frequency but if it
>is 60Hz a nice value is 0.214 using a 14 x 2 MMC.
>
>
>At 11:47 PM 10/7/2003, you wrote:
>  >Maybe i will ghet CD caps 942C20P15K: 2000volt DC at .15 microfarad
>  >what
>  >do you reccomend for 15kV 120 mA nst?? I need 25 nF for resonant bud i do
>  >not want resonant i destroyed my Maxwell . So whad do you suggest how much
>  >cap for a durable MMC really durable i will not push my luck and i wont it
>  >to work for long time.
>  >
>  >Best Regards
>  >
>  >Krešo
>  >
>  >P.S. Terry dont kill this post is it-s important