Re: [TCML] HV capacitors wanted

["Phillip Slawinski" <pslawinski@xxxxxxxxx>]

If you're stuck with glass bottle capacitors, you should try baking soda and
water instead of salt and water.  Supposedly baking soda is more
conductive.  Also you should be careful that the foil is far enough from the
tops of the bottles.  If it gets too close to the caps it will start to arc
and eventually you will have a big mess on your hands.  (Been there, done
that).

I would just do as DC suggests, and save up for some MMC caps.  Bottle
capacitors are never going to give you excellent performance.

On Mon, Dec 1, 2008 at 21:49, Christopher Karr <chriskarr4@xxxxxxxxxxx>wrote:

>
> Hello, please forget about the whole Chrishitstopher thing, as I was making
> a new email address and I didn't want a recognizable name.
>
> I have built the saltwater capacitors, before, and they were very
> inefficient, because I used aluminum foil rather than the saltwater for the
> outer dielectric. My dad told me that he didn't feel comfortable with me
> having high voltages running in saltwater, so I couldn't build the more
> efficient capacitor design. I may try it, soon, anyways, out of desperation.
>
> Anyways, I was hoping for some better capacitors that are made for high
> voltage by a company so that the losses are at a minimum with a small
> package size.
>
>
>
> _________________________________________________________________________________________________
>
>
> Hi Chrishitstopher (?),
>
> Before discussing capacitor specifics, we need to be clear on the
> transformer configuration.
>
> OBIT's are typically 10kV @23mA, midpoint-grounded.  If you're planning on
> wiring the secondaries in series to achieve 20kV, it won't work.  The fact
> that the secondary midpoints are tied to the case thwarts that plan, and
> there's nothing one can do to get around it.  Instead, tie the secondaries
> in parallel to achieve 10kV @46mA.  It will still process the same amount of
> power, but won't fry the OBIT's.
>
> The cap size for a 10/46 power supply, assuming you have 60 Hz power and a
> static gap, is between 15 & 20 nF.
>
> If money is short, a salt water cap is the cheapest and most reliable
> route.  I've personally not ever built one, but I understand that a 12 oz
> beer bottle is good for about 0.9nF each (but YMMV).
>
> Regards, Gary Lau
> MA, USA
>
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of Chrishitstopher Klaus
> > Sent: Monday, December 01, 2008 7:06 PM
> > To: Tesla Pupman mailing list
> > Subject: [TCML] Capacitors
> >
> >
> > Hello, everyone. I'm a fifteen-year-old coiler, and I don't have much
> money. I'm
> > working on my first coil (I've gotten it running, before) and my
> capacitors recently
> > broke. What I need is a number of capacitors or a single capacitor rated
> at 10nF
> > and 20kV. I'm building the Tesla Coil with two OBITs in series-parallel
> arrangement.
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