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Acrylic or PVC are both excellent coil form materials, and while a 3" x 15" secondary would be great for an NST powered coil, you may be underpowered if you try driving it from an ignition coil. I'd suggest a 13" long closewound winding of #28 AWG, leaving an inch free on each end of the form. This will give you about 900 turns. A flat spiral primary is also a good choice. Any good sized hardware store will carry incandescent lamp dimmers - these are generally no more than $4 - $7 apiece. However, the inductance of your ignition coil and the low resistance of your series heating element may be combining to overload common dimmers, so the new one may also fail. You probably should look for an inexpensive 7.5 - 12 kV NST instead, since it will be much easier to charge the beer bottle caps. You'll probably need at least a six-pack, or more, to bring your system into tune. And, if you can put the bottles in salt water you will increase the capacitance somewhat since you'll be eliminating the air space between the outer foil and glass. Sounds like you are off to a good start - keep us posted on your progress! Best regards, -- Bert --
: list and the tesla-2 list researching and planning.
: I am planning on winding a new secondary for my coil. I have an acrylic
: tube about 15in long and 3in diameter, would this be a good form, or
: should I use PVC? I have read that PVC is not a good form but I dont
: know why.
: If I use #26 wire (which I can buy from McMAster-Carr cheap) how many
: turns should be on the secondary? I will probably use a flat spiral
: primary.
: Oh yeah, my lamp dimmer died Where can I easily get another
: transistor-powered lamp dimmer-like circuit, or build one? I have some
: power transistors I believe somewhere... I want it to be powered by AC
: as i dont have a good DC source, but i could build one i believe fairly
: easily.
: Also, the beer bottle cap- should the bottles be in salt water, or just
: wrapped in foil? Putting them in salt water would increase their
: capatince per bottle, right?
: Thanks for your help!
: =Rockinriley14=
:
:
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