Re: Reducing toroid size

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 6/8/02 8:19:11 PM Eastern Daylight Time, tesla-at-pupman-dot-com
writes:

You're not really getting any benefit from the bicycle wheel.
You can simply replace it with a smaller toroid and get the same
or better results.  You could put a sphere about 4" dia on top
of the secondary and get a good result.  or a toroid that is about
2" x 6" or 2" x 8" something like that.  You can just retune
the primary (change the tap point) to keep the coil in tune.  
You may need to install a breakout point or bump on the
toroid to permit breakout, depending on its radius of curvature.

If you make the new secondary with thin wire, it won't tune
at the same primary tap point even with a small toroid.  I'd just
leave the secondary as-is for now, and just install a smaller
toroid.

John



>
> I am getting 3"-4" from my 3"dia x 10 7/8"high 440 turn secondary but then, I
> am using a massive 2 foot bicycle wheel as a toroid; I feel that
>
> the setup takes up too much space for such a modest performance and it would
> be
> desireable to reduce the physical size of the TC to some extent.
>
> Would it be possible to get same performance (or better) with a much smaller
> toroid if the secondary had same area but was wound with finer wire eg. 880
> turns of 0.011" diameter wire instead of the 440 turns of 0.022" diameter
> wire
> that I am presently using?
>
> I have calculated that this will quadruple the secondary inductance so I will
> have to quarter the toroid capacitance to keep the secondary in tune -so will
> I
> have to quarter the physical size of the toroid to accomplish this?
>
>