Re: High Voltage Design (fwd)

[Steven Roys <sroys@xxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 3 Jan 2004 01:22:00 -0600
From: Dr. Resonance <resonance@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: High Voltage Design (fwd)


With stacked dual toroids, capacitance is normally 1.6 times the cap of a
single toroid.  The lower toroid shields some of the electrostatic lines of
the upper toroid.  This same shielding effect occurs when placing a toroid
atop a Tesla coil.  You can not assume it's isotropic capacitance value is
correct.  The coil usually produces a shielding effect and reduces the
overall capacitance 10-15%, sometimes even more.

Correct measurement is achieved by placing the toroid on the coil and
measuring the resonant freq of the combination vs the resonant freq w/o the
toroid.  Knowing the measured inductance of the coil it's just a matter of
subtraction to determine the operating capacitance of your toroid.

Also, adding 5 pF/ft of spark length will give you even more correct
operating values of your TC system.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
> Hi All:
>
>      For HV design the toroid is much more flexible than the sphere.  May
I
> suggest an alternative design possibility?  Use two large toroids spaced
> apart.  A hole in the lower toroid provides entry into the shielded space
> between the two large toroids.  The hole in the lower toroid is
encoumpassed
> by a small reverse toroid as has been mentioned before.  The small reverse
> toroid can be made with the two halves of one of John Freau's toroids
> clamped, copper taped, conducting glued, etc., over the hole.  The center
of
> the small toroid shells can be cut out with a simple band saw by laying
them
> on their flat sides.  The transition can be smoothed with copper tape.
The
> two big toroids can be held apart with three tapped metal rods,  pipe
> sections from the hardware store (small flange on one side, sawed off
> coupler on the other side maybe?), or threaded rods covered with straight
> sections of metal tubing, or a sheet of aluminum all the way around the
> inside of the toroids.  Adding more capacitance is simple.
>
> B2
>
>
>
>