RE: panasonic mmc rating?

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

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

Hi Larry,

Nobody does "math" anymore :o))  Just get the computer program:

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

============================
MMC Calculator  Ver. 2.2   9/12/2000  Terry Fritz
Transformer voltage =  6500 
Transformer current =  .02 
Firing voltage =  9192.365 
Fo =  200000 
Break rate =  200 
Thermal dissipation constant =  70 
Individual cap value =  3.3E-08 
 
Strings  Caps/Str  Capacitance  Voltage   Temp C    Cost              I Arms
  2        9          7.33        14400     5.17   18.00  :-))  :-)   2.59 
--------------------------------------------------------------------
  3       13          7.62        20800     2.48   39.00  :-))  :-))  2.69 
  4       17          7.76        27200     1.45   68.00  :-))  :-))  2.74 
  4       18          7.33        28800     1.29   72.00  :-))  :-))  2.59 
===============================

I "knew" the current handling of the caps already since I have done so much
work with Panasonic caps.  But MMCcalc should do everything you need.
There is a little text file that explains it if I remember right.  Just a
silly little DOS program but it does the math...  It is based of that earth
shattering paper at:

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

Don't take the "life expectancy" stuff too seriously.  MMCs seem to last
just fine.  I just copied that data from some cap manufacturers.  But they
seemed to know less than I did back then ;-))

Cheers,

	Terry


At 07:31 PM 9/25/2002 +0000, you wrote:
>Terry response I accidentally deleted.
>essentially it was
>"according to my calculations... the cap draws about 4arms"
>
>so....
>If I wanted to do these calculations...
>I'll just make up some numbers...
>6.5kv 20ma nst.
>charging current 20ma.
>7.5nf cap.
>charge time 1/120 s.
>cant remember the formula (ready for this butcher job?)
>something like charge time * charge current * charge voltage = joules
>charge time is the inverse of frequency.
>
>therefore... if cap charging is 60hz, discharge is say... 200khz.
>perhaps watts * ratio of charge freq by discharge freq
>== assuming a lossless transfer ==
>
>I've been known for creative math (as i call it),
>which some might just call 'plain wrong.'
>
>larry.
>
>