Re: Building a 4"

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

Original poster: "Allanh by way of Terry Fritz <twftesla-at-qwest-dot-net>" <allanh-at-starband-dot-net>

sounds like you have made a good start. The Geek group has a good cap. the
.15mfd./ 2000 vdc. from CD. I orderd my caps directly from CD, but I use the
.33 mfd/2000 vdc because I wanted more cap with fewer numbers. They cost the
same as a .15 and I got them in
4 days.

allan

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, October 07, 2002 6:22 AM
Subject: Building a 4"


>
> Original poster: "Jeremy Scott by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<supertux1-at-yahoo-dot-com>
>
> Hi,
>
> I'm an avid electronics adventurist making my
> first coil. Those capacitor-diode voltage multipliers
> just don't do it for me anymore :)
>
> Anyway, the coil I am building is a typical 4.5"
> secondary. I have completed the primary (16 turns .25"
> copper fridge tube .25" apart, 30 degree inverse cone)
> - so far so good.
>
> Now I have my questions:
>
> I am designing this to use a 15Kv/60mA neon
> transformer. I found a place to get one new
> for $150. I'm not sure if this is a good
> price for new, me thinks its kind of expensive.
> I've called all my local neon shops (about 3)
> and they don't have any old ones to give me.
>
> Does anyone on this list have a better source
> for cheaper neons, preferably new ones?
>
> I tried building a few capacitors already, and
> most of them are a pain in the butt. (Saltwater,
> rolled aluminum flashing, etc...)
>
> I've decided to go MMC. My capacitor research
> tells me that metal-polyethylene are the ones to
> use. At 15kV/60mA, I figure a .01 ufd will
> give me the most bang. I've found a list of
> known working MMC capacitors, some of them have
> their voltages rated in AC while others are DC.
> (I looked up the technical specs of some of them.)
> It makes it difficult to figure out how many of
> each I'll need because those rated in DC volts
> have quite a substantial reduction in the
> rating in AC volts. (RMS?)
>
> Does anyone have a recommendation as to a)
> what combination of ufd/voltage/qty and b) a good
> soure to get them? (DigiKey is WAY expensive, there
> has to be somewhere else cheaper.) I'd like to play it
> safe, spend the extra money for more capacitors and
> NOT have them explode. :)
>
> Other than that, I'm off to winding my secondary :)
>
> TIA,
>
> -Jeremy
>
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