Re: Where do I get a couple Caps

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

Original poster: Tom Wideman <twidem01-at-baker.edu> 

Ok. I get what you're saying. I am BISE student going for an
EET. So the math is nothing new. Nor is the electronic
stuff. I just am new to tesla coils. So I don't know what
formulas to use and so on. I am building my coil based off
of Dan's MiniKatz coil.  He said he wanted to upgrade his
MMC from .0112uF to .0224uF. So I just desided to start out
with that.  I used .024uF in the calculator at "Classic
Tesla." So first question.  Is that accurate? Does the calc
work? And now that I know that little formula I feel smart!

SO:

4000/.03=133333.33333Ohms Which is total resistance
including capacitance. r=XL^-1 XL=2pi(60Hz)L

L=19.89nF

L pi/2= 31.23nF

OK.  BUT CAN ANYONE OUT THERE CHECK OUR MATH (Thank God for
the TI-89)?? lol

Thanks for your help.
Nano2e



---- Original message ----
 >Date: Thu, 22 Apr 2004 17:19:59 -0600
 >From: "Tesla list" <tesla-at-pupman-dot-com>
 >Subject: Re: Where do I get a couple Caps
 >To: tesla-at-pupman-dot-com
 >
 >Original poster: Terry Fritz
<teslalist-at-twfpowerelectronics-dot-com>
 >
 >Hi,
 >
 >Sort of.  With a 4000V NST you want 6000 volts across the
caps.  In the
 >Tesla coil case, we can use the DC ratings.  So four
942C20P1K in series
 >will give 8000 volts at 0.025uF.  When you put the caps in
series, the
 >voltages add up and the capacitance value divides by the
number of
 >caps.  It is nice to get the 0.15 or 0.10 caps from the
geek group since
 >they sell in small quantity.  Jim also had a suggesting
using caps from
 >DigiKey.  I am not sure how familiar your are with all this
so let us know
 >if it is not clear.  We never know if noobs are plumbers or
Ph.Ds in
 >electrical engineering till we get to know you ;-))
 >
 >Are you sure 0.025uF is the value you need?  I would think
you would want
 >an "LTR" size.  What kind (static or sync) spark gap do you
want to use
 >(probably static)?
 >
 >4000 / 0.03 = 133333 ohms = 1 / (2 x pi x f x C)
 >
 >If f = 60Hz...  Then C = 19.56nF
 >
 >LTR (static gap) = 19.56 x pi / 2 = 0.0307uF...
 >
 >I would think that you would want 0.0307uF if you are using
a static gap
 >and your line frequency is 60Hz?  Of course, I may have
messed up the math
 >'as usual' too ;o))
 >
 >Cheers,
 >
 >         Terry
 >
 >
 >At 01:35 PM 4/22/2004, you wrote:
 >>So is this the kind i want?
 >>
 >>http://www.cornell-dubilier-dot-com/film/9422000.htm
 >>
 >>(Part #:942C20S22K (3 one down))
 >>
 >>Nano2e
 >>
 >>
 >>---- Original message ----
 >> >Date: Thu, 22 Apr 2004 12:08:26 -0600
 >> >From: "Tesla list" <tesla-at-pupman-dot-com>
 >> >Subject: Re: Where do I get a couple Caps
 >> >To: tesla-at-pupman-dot-com
 >> >
 >> >Original poster: Terry Fritz
 >><teslalist-at-twfpowerelectronics-dot-com>
 >> >
 >> >Hi,
 >> >
 >> >Look here:
 >> >
 >> >http://www.thegeekgroup-dot-org/mmc/
 >> >
 >> >You could use six of the 0.15uF or four of the 0.10 uF.
 >> >
 >> >Cheers,
 >> >
 >> >         Terry
 >> >
 >> >
 >> >At 10:04 AM 4/22/2004, you wrote:
 >> >>Hey..I am looking for a total .024 uF in my MMC (did I
say
 >> >>that right (NOOB!)) What should the rated voltage be if
I
 >>am
 >> >>using a 4000V 30mA NST? What kind should they be (I am
 >> >>looking at Metallized Polypropylene)? And where can I
get
 >> >>just a few?
 >> >>
 >> >>Nano2e
 >> >
 >> >
 >
 >