Original poster: Shaun Epp <scepp@xxxxxxx>
Oops I made a error on my first post, Here's the correction
The actual equation for Inductance that is written in physics books that
I've seen is:
L = u N^2 A which clearly shows that inductance is
----------- proportional to the the area of the coil
l (A), the number of turns squared (N),
and inversely proportional the the
lenght of the seleniod (l)
u = 4 pi 10^-7 (mu)
A = pi r^2 r is radius of coil
so --- 2 pi r N is approaximatly wire length, if you ignoring the
length of the
selenoid.
(wire length)^2 = (2 pi r N)^2 + l^2 is probably more accurate.
Your equation works, but It wasn't designed to show that wire length
was proportional to resonance. A person could stuff anything into
an equation if they divide out what doesn't belong. (4 pi)
Shaun Epp
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, December 05, 2005 4:59 PM
Subject: Re: Tesla coil formula
Original poster: Jared E Dwarshuis <jdwarshui@xxxxxxxxx>
I'd like to respectfully suggest that that may be because you have
to effectively introduce a fiddle factor by adding a specific amount
of terminal capacitance to make it work (and what's worse, adjust
that capacitance for a specific coil geometry). We have come full
circle. Discovering that hidden factor in a plethora of wire length
equations (all of which were sworn as gospel by their proponents)
back in the eighties was where I began my investigations which led
to my adopting the now popular L and C approach.
Malcolm
Hi: Malcolm
For an air cored inductor, the inductance, as derived by Maxwell's
equations can be written as:
L = u ( wire length )Sqrd / (4pi l )
Prominent is the wire length, a sadly neglected geometry.
Jared Dwarshuis