RE: [TCML] Toroid size

["Jim Calvin" <jcalvin@xxxxxxxxxxxxxxx>]

Hi Bart,
	I picked that value because I figured the transformers could drive
that load (Z = 1/2*pi*60* C).  Is this too much capacitance?  And if this is
the right size toroid why am getting only 2 foot arcs at my break out point.
I figures I should get around 45-47 inches.  I used an oscilloscope/ signal
generator to determine the secondary impedance and I tuned my primary to
this frequency.

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of bartb
Sent: Wednesday, March 05, 2008 11:30 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Toroid size

Hi Jim,

I'm thinking 6" x 30" would be about right. This gives a decent smaller 
diameter but not too big. The 30" outer size is due to the coil size.

You are apparently running a resonant cap size with the transformer. Why?

Take care,
Bart

Jim Calvin wrote:
> I have just finished a building a medium sized tesla coil.  It uses 9KVA @
> 120ma.  It has an 8" x 33" secondary and uses a dual tungsten spark gap
with
> a fan.  It has a primary tank capacitance of .0346uF made from an MMC cap.
>
>  
>
> I tried running it with my 30 inch toroid that I use on my big coil
(7.8KVA,
> 7 feet tall).  I know this toroid is too big for this coil but it is the
> only one I had available, besides my 12 inch toroid which I believe is too
> small.  With no breakout point I got nothing.  When I put a breakout point
I
> got about 2 foot arcs.  Now I expect to get about double that with the
right
> size toroid.  So my question is: what is the proper size toroid for a coil
> of this size and power? (18 inch, 20 inch . etc). 
>
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>
>   
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