[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Building the right capacitor

Original poster: "Krohns" <2halice@xxxxxxx>

Hi Drake and Kyle,

A tank capacitor for an NST of 15KV @ 120mA will need to be around 0.04uF.
You can make a 0.0409uF cap by building an MMC (Multi-Mini Polypropylene
Capacitors), made of thirty-three 0.15uF 2000 VDC Cornell Dubilier caps,
Part Number 942C20P15K-F.  You can purchase them from Eilene at Richardson
Electronics, phone number 1-888-735-7358.  If you try to order them from
their Web site, you have to purchase a minimum quantity; not so if you call
directly.  The cost per cap is $3.22.  You will also need thirty-three 10
meg ohm 1/2 watt resistors for safety, since your current rating is so high.

To make an MMC tank capacitor you need 3 strings of 11 caps each, wired in
series with a resistor in parallel across each cap. When you make your
strings, make sure that you leave 2/10 inch physical spacing between each
cap.  I didn't do that and I had to jam 0.30" plastic sheeting between each
cap to increase the insulation factor.  I made a two string 0.03uF MMC for
my 15KV @ 90mA transformer array.  You can use my layout as an example and
then simply add a third string in parallel for a total of 0.04uF.  My Tesla
coil page address is: http://www.halice.com/physics/tesla-1.html.  There is
a schematic of my Tesla coil toward the top of the page that shows how the
two strings of my MMC are wired and a few pictures of the layout down the
page.  If you have any questions, please feel free to email me at

FYI, I plan on firing the Tesla coil on my Web page in 2 weeks.  I've got to
make the NST protection filter, finish a couple of toroids and finish
putting the baffles in my secondary coil.

Cordially, Hal in Tucson

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, May 12, 2006 12:07 PM
Subject: Re: Building the right capacitor

> Original poster: "Drake Schutt" <drake89@xxxxxxxxx>
> yes, i was wondering myself.  would a maxwell 35kv 0.03 uf be
> sufficient?  theyre going for $125 US on ebay.
> On 5/12/06, Tesla list <<mailto:tesla@xxxxxxxxxx> tesla@xxxxxxxxxx> wrote:
> Original poster: "Kyle Sandbornhesium"
> <<mailto:sandbornenterprises@xxxxxxxxxxx> sandbornenterprises@xxxxxxxxxxx>
> What parts are needed to build a capicator for a 15kv 120 ma
> transformer and do you have any tips on building it?
> Cheers,
> Kyle
> _