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Re: Where do I get a couple Caps
Original poster: Tom Wideman <twidem01-at-baker.edu>
ah yes...quite right. XC...not XL. Thank you. Do you know
if the calculator on classic tesla is accurate though?
Thanks again for your help!
Nano2e
---- Original message ----
>Date: Fri, 23 Apr 2004 21:12:56 -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,
>
>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
>> >> >
>> >> >
>> >
>> >
>
>