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Re: [TCML] Newbe's First Coil



cbroring@xxxxxxx wrote:
Thanks for the suggestions.

I just removed the pizza plate and wrapped the cookie tin with a length of 4" aluminum dryer duct. This made a rather stable 18" diameter toroid. Re tuned by one tap on the primary and it acts a little different. No more sparks coming off the top load at all unless I bring a grounded probe near it. Then I get about a 8-9 inch arc to the probe. If i lay a screw driver on the toroid to make a sharp point (no, I'm not holding it in my hand) I do get some discharge off the tip 3-4 inches long. The arc to ground is about the same length as before i re-did the top load but more intense now, so that's a step in the right direction.


You can also do something like take a thumbtack and poke it through some masking tape, and stick it to the outside of your toroid.


All connections in the 10kv wiring are made with sheet metal screws directly into wood. Guess i need to fix that. I have some 1/4 nylon or delrin sheet I can cut up for insulators.


Hie thee to the market and get a cheap HDPE cutting board. You'll never use wood again for this kind of thing.




The primary windings are supported with wood rods. They are loosely close wound and rely on air and the plastic jacket for insulation. The wire says 600V insulation, rms I guess. With two layers of insulation between each pair of conductors I am right around the maximum rating of the insulation. This doesn't take into account leakage, but no signs of shorting between turns yet. Anyone else use close spaced pvc insulated Home Depot house wire for the primary inductor?

Most folks use a flat primary with the turns spaced about 3/8" to 1/2" or more. Makes it easy to move the tap point in fractions of a turn.


Any Idea how much input wattage a coil of this size can take?


half a kilowatt? (your caps will probably be the limiting component)
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