Re: Where do I get a couple Caps

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

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

Hi,

There are a ton of formulas at:

http://home.earthlink-dot-net/~electronxlc/formulas.html

In your equation below, you want to use XC not XL

So:

4000/.03=133333.33333Ohms Which is total resistance

including capacitance. r=XC   XC=1/ (2pi(60Hz)C)

133333 = 1 / ( 2 x pi x 60 x C)

C = 19.8944 nF

So you got it right anyway ;-))

If you want to run LTR, which I highly recommend, you can increase the 
capacitor size by pi / 2 which gives 31.25nF.

Cheers,

         Terry

At 09:42 AM 4/23/2004, you wrote:
>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
> >> >
> >> >
> >
> >