BTW my friend Der Strom it wasn't the angle problem, i took the pic before i finished the table so it was all the way down ^_^
i will test it soon and by that i mean next Tuesday cuz we are in a vacation right now
i will report my lunching
i couldn't make the primery part round because the wire was too strong
my HV Hawg capacitor is 21.6 nF instead of 21.2 nF ,,
does that effect my design and will it work ?
Instead of wire, try copper tubing. At these voltages and frequencies, the wire has a "skin" effect where most of the current travels on the surface anyway. For making perfect-looking round bobbinless coils, I wind them around a cylinder that's smaller than what I want, then they "spring back" to the larger diameter. With this you would probably want to find a cone shape to wind them around.
Won't affect it, this design is a relaxation oscillator that will find its natural resonance.
It often helps to make the tunable primary, though. Wind an extra turn on it, and instead of having that outside lead head back to the supply, use a small battery clamp or something like this -
View attachment 58356
- so that you can adjust it for peak resonance with the secondary.
I think you guys are getting way overboard on the use of large copper tubing for secondary. While it is true that the primary tank circuit Q is important, when you factor in the loading of the secondary leakage there will not be much improvement in Q compared to reasonable gauge wire.
I believe you want to go for resonance of primary in the 75 kHz to 150 kHz range. Lower freq. gets you higher voltage but higher freq. is more fun to physically play with. You can check by lightly coupling into primary with function generator and AC voltmeter through 1 pF coupling in series with each. (obviously not excited by neon transformer). Voltmeter will peak at resonance. You can also measure Q by 3 db bandwidth but you will likely get a higher number then actual operation due to length of spark gap conduction reducing operating Q.
I don't know what you guys are using for resonating cap but I had problems with blowing holes through 1/8" plate glass insulation. I was driving with 12kV neon sign transformer. Went up to 3/16" glass and did not blow holes. I used parallel resonant primary with spark gap in series with neon transformer. It was about 3/4" gap if I remember correctly. Too close and just sizzles at 50/60 Hz. Too great and doesn't spark. When gap is correct it makes a hell of a racket. Neon transformer secondary was center taped which is where I hooked secondary bottom return. My primary was about 20 turns of spark plug wire (non-resistive type). With your copper tubing with so few turns your cap has to be high value which is tougher for getting high voltage rating.
That was suppose to be primary in my first sentence. I might have returned secondary to non-spark gap side of primary. It was 50 years ago and just going by memory. (no, I did not know Tesla personally) Resonating cap was about 3.5 nF, but I had more primary turns.