Re: Capasitor match
In my case I am building my first coil. I have the primary, 11-1/2 turns
of 1/4" copper tubing spaced on 1/2" centers (about 7" inside and 18"
outside diameter) and the secondary, 4" coil form with 21.2" of 22 AWG
polyamide-imide magnet wire. My power will come from either a
Franceformer 15KV 30mA or a Johnson Electric 15KV 30mA (or maybe both in
parallel). I had planned on a MMC rated at 24KV and 0.0112 uF total. Is
this a good cap design? Using 45 of your poly caps I figured three
strings of 15 serially connected caps would do it?
On Mon, 14 Feb 2000 21:31:55 -0700 Tesla List <tesla-at-pupman-dot-com> writes:
> Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
> Hi Bryan,
> There are three basic capacitor sizes:
> 1 Resonant. This is the size that will resonant with the
> transformer at
> 60Hz allowing fairly high power transfer. You will get more that
> breaks per second. Safety gaps are an absolute must because if
> goes wrong the voltage can jump up to like 50,000 volts and blow
> up. These are very popular but they have left many dead NSTs in
> their wake.
> 2 "Big"(I just made that up) This cap size is about 50%
> large than a
> resonant cap and has fewer BPS but the larger cap makes up for it.
> It is
> far less likely to destroy anything if something goes wrong. I
> recommend this. Many would consider this as an "LTR" type but I
> like to
> reserve that for the really optimized coils.
> 3 "LTR" Larger Than Resonant. The cap size is the maximum
> that can be
> charged at the line frequency. This usually takes advantage of the
> of a rotary sync gap to work. Very safe and has very good power but
> complex to figure out and build.
> These are all for NST systems that have current limited
> Other transformers have other considerations. Let us know what kind
> transformer you have and a little detail on your coil and we can be
> At 07:23 PM 02/14/2000 -0500, you wrote:
> >Hello everyone,
> > I am building my first capasitor. I know you want to try to
> match the
> >capacitance of the capacitor with the transformer, but is it okay
> to go
> >Is there any advantages/disadvantages to haveing a larger
> capacitor? Thanks
> >for any help.
> >Bryan Miller