Re: what capacitor for TC...other newbie questions

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

Original poster: "Jason Petrou by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jasonp-at-btinternet-dot-com>

I dont think that they will do - they will get REALLY hot!! they will
proibably burn up if you use them for TC use. You want a low loss
dielectric, like polythene.

Jason

Geek # 1139 Rank G-1
www.thegeekgroup-dot-org

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, July 07, 2001 3:33 AM
Subject: Re: what capacitor for TC...other newbie questions


> Original poster: "Rick W by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<rickwilliams404-at-earthlink-dot-net>
>
> Ok, will do.
> I'm building the NST protection circuit to the letter you suggested in
> another (thread?). Ordered all parts from Digikey. I've found it's ALWAYS
> best to heed the advice of the experienced! :)
>
> I'm a newbie to the list and found it full of great info.
>
> Rick W.
>
>
>
> ----- Original Message -----
> From: Tesla list <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Friday, July 06, 2001 7:53 PM
> Subject: Re: what capacitor for TC...other newbie questions
>
>
> > Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> >
> > Hi Richard,
> >
> > At 09:36 AM 7/7/2001 +0800, you wrote:
> > >What are the thoughts on metallized polyester?
> > >I have 4 .022uf -at- 16000vdc. These can be found at Allied Electronics:
> > >http://www.alliedelec-dot-com/catalog/pf.asp?FN=571.pdf
> > >
> > >Though it's a DC spec there is no polarity on these caps. No AC spec is
> > >provided but it would be less than the 16Kv DC rating.
> > >
> > >
> >
> > Polyester has a dissipation factor about ten times higher than
> > polypropylene.  This means that they will run about 10 times hotter
given
> > the same RMS current.  Since Tesla coils are super hard on caps, this
10X
> > heating is a killer.  Tesla caps really need to me made from the lowest
> > dissipation factor materials available to have a chance of surviving in
> > this extreme duty.  Also, "metalized" caps have poor end terminal
> > connections that tend to burn out with 1000 amps spikes like Tesla coils
> > may create.  You really need metal "foil" caps that use solid metal foil
> > for the electrodes.  There is a list of known good/bad caps at:
> >
> > http://hot-streamer-dot-com/TeslaCoils/MMCInfo/good-bad.txt
> > http://hot-streamer-dot-com/TeslaCoils/MMCInfo/mmcinfo.htm
> >
> > We are very picky about the caps used in MMCs.  I try and test them
pretty
> > hard*.  They have to be some of the best available.  They are not cheap
> but
> > the Geek Group's prices are very good!
> >
> > *http://hot-streamer-dot-com/TeslaCoils/MMCInfo/GeekCaps/GeekCaps.htm
> >
> > Cheers,
> >
> > Terry
> >
> >
>
>
>