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Re: RE: [TCML] Toroid Problems





Nicholas -

You stated that your toroid was made from "dryer duct" material. Can you confirm that this is really convoluted aluminum HVAC ducting (formed from heavy gage aluminum foil, like disposible pie-pans are made from), and not the thin aluminized polyester material wound around a coiled spring core? You need to use the HVAC duct material, which comes compressed but is stiff enough to hold out at 90 degrees without sagging. The usual "dryer duct" material is metallized plastic film over a wire core (like a "slinky" toy), and is NOT conductive. I have seen several first-time coilers get confused by the "dryer duct" material, which may look similar to the HVAC duct material if you're looking at a photo on the internet. Quick check: take an open flame and apply it to the material. The aluminized polyester material will instantly melt,laving only the inner spring, but the flame will have no effect on the aluminum HVAC duct.

I've been following this, and I have just a brief note re: the use of drier duct- It's been a while since I put my topload together, so I don't recall for sure which type of material I used. However, I did cover the entire thing with aluminum foil tape, and I get pretty decent sparks off of it. I just thought it might be a way to recover the topload without having to start all over.

Neal.
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