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Re: Top Toroid
In a message dated 97-02-02 00:58:34 EST, you write:
<< All,
> > Does any one have voltage holdoff vs radius of curvature
>>values or formulas for toroids? Or suggestions for ROC vs power level?
> >
>>I'm asking because I've bought my TC back on line and I only getting
>>2' air discharges from the toroid. WHAT you say! Only 2' discharges?
>>Yes but, there are about a dozen at once. I'm using a 15kV 60ma
>>transformer, 16nF primary cap, 120uH inverted cone primary, 8" by 20"
>>#22 secondary and a 27" by 3" toroid. The resonant frequency
>>(instrument measurement) is 133kHz.
>
>>Any suggestions for a toroid major and minor diameters for this?
>
> Regards,
>
>> jim
>Jim
> You are in the ball park of normal operation of one 60 ma transformer! It
> sounds like you are breaking out too soon. Probably due to a short radius
>of curvature on the 3" minor axis toroid! That's a big secondary for for
>that one little neon xfrmer! The .016ufd cap is also a bit big for the
>transformer. It sounds more like early breakout though with multiple 2
> footers. Try a smaller diameter, fatter toroid.
>Richard Hull, TCBOR
>>
Jim, Richard,
I agree that a larger toroid should help. My TC was very similar to yours in
many ways: 15kV, 60ma trans, 7" x 19" sec wound with #25 magnet wire,
.018uF cap, but I used a 6 x 26" toroid stacked on top of a 4 x17"
toroid. My gap system was simply 6 giant steel roller bearings placed in
line with 1/8" spacings between them. Spark output was at least 49", but may
have been longer. I used a 0 - 140V input variac for max blasting power!
Happy Toroiding!
John Freau