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

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

Original poster: "Laurence Davis" <meknar-at-hotmail-dot-com> 

There have been a few rather capable people on the list
that have tried such a small secondary.  Some interesting results
but usually leading to failed secondary due to racing.
10kv/30ma input on such a small coil sounds very high energy per bang.
search for "sam barros mini coil" ( a pen style tesla coil )

For a first project, a secondary of 2inches or so would likely give results.
something so small would just give quite a bit of problems.
Your 'first light' will get you hooked, then try to build a smaller one.

the smaller ones have high voltage stresses on the secondary and are difficult
to overcome.  A sweet spot of 2" - 4" secondary diameter, 0.1-0.15 coupling 
for a static gap
coil.

larry.
>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
>
>-- 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
>