.::Toroids::.

This is my 3.5" x 9" toroid originally constructed for the 4" coil. It is made out of aluminum flex duct, and then covered with aluminum tape for rigidity. Toroids made of AL flex duct are very fragile, and will dent if dropped. The center is a circular piece of sheet metal.

This is my 4.5" x 15" toroid. This toroid is made out of corrugated plastic drain pipe and then covered with aluminum foil tape. The center is sheet metal. This is one strong toroid, and after building this one I probably won't make another AL flex duct toroid. Current configuration for the 4" coil utilizes these two toroids stacked together about 6" above the top of the secondary coil.

This is my 3.5" x 1" foam core toroid that I made to see if extruded polystyrene could be "machined" on the lathe. The answer is yes! It is made out of 3/4" x 2' x 8' R4 pink insulation board bought at Home Depot. I plan to make something like a 5" or 6" by 20" toroid and then cover it with aluminum foil tape like D&M High Voltage does for their "economical" toroids, which I believe are also foam core.

This is my new 2" by 6" overall foam core toroid. I tested this on my mini coil, and it did not break out without a small foil bump on the side. I may sell these some day for $10.

This also is a foam core toroid. It is 1" by 3" overall. I made this for a friend from school. I will not be making these for sale, as they are much too small to make, the foil strips are extremely hard to cut thin enough and straight enough.

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