Re: help needed with building a mini table top tesla coil

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

Original poster: "Malcolm Watts" <m.j.watts-at-massey.ac.nz> 

On 4 Feb 2004, at 11:49, Tesla list wrote:

 > Original poster: mizpoon <mizpoon-at-burningart-dot-com>
 >
 > Hello everyone,
 >
 > I was hoping you could help me with my first table top
 > tesla coil. This is really my first high voltage
 > experiment, so any input you have would be very
 > helpful.
 >
 > I have a mini secondary coil and toroid, and am trying
 > to figure out its resonant frequency so that I can
 > size up the transformer and capacitor I need for the
 > primary.
 >
 > my secondary coil has a radius of 0.5 inches, 7inches
 > high, and has 448 turns of very fine wire.
 >
 > the toroid is a brass doorknob (!), about 2.125 inches
 > wide, 1.5 inches tall.
 >
 > According to my calculations, I have an inductance of
 > 673 mhenries, and a capacitance of ~ 7 micro farads
 > (for both the coil and the toroid), leading to

I do believe the units should be microHenries and picoFarads. On the
face of it, the values look OK.

Malcolm

 > -- a frequency of 3887883 hertz --
 >
 > -- a transformer of 10K at 30ma, and a capacitor at   0.00795 mfarads
 > --
 >
 >
 > before I go ahead with these calculations, can you
 > tell me if this seems even vaguely right, or am I way
 > off with these calculations?
 >
 > I used this site for most of my calculations btw:-
 > http://home.earthlink-dot-net/~electronxlc/formulas.html
 >
 > Thanks again for all your help,
 >
 > mizpoon
 >
 >
 >