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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
First off, welcome .
Well, it would work, but it is probably far from ideal. It is not just high voltage that likes the 'lots of thinner wires', it is pretty much high frequency in general.
But, this wire is too thick, and you would not get many turns with 100', unfortunately.
Also, there are only 8 internal conductors, which is not very many. This type of wire that has many strands of *very* thin wire, insulated from one another, is called 'litz'. It is used especially for high frequency transformers.
As far as i know, nobody here, at least, has tried litz for a secondary. It would be interesting to see, though...
Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
Don't use the networking cable. Save it for something else, like a gate driver transformer. 100 feet of cable? Thats hardly going to give you any turns on a secondary coil. Its inductance will be so small that will have to drive the resonator at MHZ frequencies even if you did wind it into a coil.
Just get some magnet wire from an old transformer, ebay, or from radio shack. Secondary coils usually have 800+ turns.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
(Any way to connect magnet wire end to end without screwing up insulation? Does using electrical tape work at those voltages?)
Somebody buildiing a nice shiny TC would not connect magnet wire pieces to make a secondary; but yes, you can connect magnet wire pieces. Insulation tape is a bit bulky, several layers of varnish or a single turn of sellotape would be sufficient.
If you are building a first coil just to get your enthusiasm up, then go for it. Several pieces of magnet wire joined in series will be infinitely better than cat-5.
The sort of problems that the joins will give you don't really start becoming apparent until you are getting streamers and sparks from the coil, and by then, that's a success, right?
You can minimise the problems by trying to have the joint have no sharp edges or points, if you can delicately poke both ends of the wire into a small round blob of solder, then that's going to be about the least bad way to do it. Minimise the diameter of the joint so it will disrupt the nice even turns on the secondary as little as possible.
Once your enthusiasm is up, and you're getting streamers, sparks, and some flashovers to the joins on the secondary, then replacing the secondary with one wound form a single length of wire will be but a small step to take.
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Q? Would Cat-5 cable work as Secondary?
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