RE: CD cap MMC

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

Original poster: Terry Fritz <teslalist-at-twfpowerelectronics-dot-com>

Hi Chris,

The chart says 0.0214uF is resonant for a 15/120 at 60Hz, so that is what I 
assumed.  If I were sharp  0:-p  I would have noted the 25nF and guessed he 
was at 50Hz and would need 25nF....  so 2 strings of 12 ;-))

But really, I would normally "always" suggest an LTR value, NOT the 
resonant value....  I assumed the poster here knew what he wanted and 
really did want a resonant value as opposed to the far more suggested LTR 
values...

Personally, "I" would "never" make a coil with resonant size caps.  Sync 
(triggered gap) LTR is by far the best IMHO...

Cheers,

         Terry


At 07:45 PM 10/8/2003, you wrote:
>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