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Re: Re - spec for my coil - comments please
to: ElectronX
If you are running standard 10 kV, 20 ma ignition or neon transformers your
connections should be in parallel to obtain 20ma x 2 = 40 ma, not in series
as you indicated. In series would double the voltage not the current and
usually quickly damage one of the xmfrs.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Re - spec for my coil - comments please
> Date: Thursday, December 10, 1998 11:38 AM
>
> Original Poster: ElectronX-at-aol-dot-com
>
> In a message dated 12/8/98 11:53:11 PM Pacific Daylight Time,
tesla-at-pupman-dot-com
> writes:
>
>
> > Medhurst K 1,00 (does this mean something?)
> > Self C 5,08pf
> > Top Load Toroid, alu duct, 4 inch D x 14 inch outer diameter
> > Top Load C 15,6 pf
> > Res Freq. With top load 235khz
>
> I would guess that your self capacitance would be greater than 5pf, due
to the
> many turns of thin wire. I wound a similar coil with even fewer turns
than
> yours (slightly different diminsions though), and it had a self C of
around
> 20pf. Measure resonant frequency without top load to deterime your actual
> capacitance.
>
> >
> > I also have the following transformers which could be used with the
system
> -
> > 6600v -at- 30mA neon, centre tapped
> > 8000v -at- 34mA OBI,no centre tap
> > 10.000v -at- 20mA series to give 40mA
> > 7500v -at- >100mA Neon (Rated is 75mA, shorted with shunts removed gives
> 120mA)
>
> Because of the low voltage rating of your caps, go with the ones under
10kV.
> All of those will handle .007 ufd. Your 10kV transformer will be slightly
> overloaded with .007 ufd.
>
> This is not bad for a cheap first coil. For any coils you build in the
future,
> you'll want a larger tank cap (0.04 with 7.5kV -at- 120mA), larger secondary
> coil, copper tubing primary, and so on. Good luck.
>
> Matt Behrend
>