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Re: Capacitor Help



Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 02:08 PM 12/12/2005, you wrote:
Original poster: "MalcolmTesla" <tesla@xxxxxxxxxxxxx>

I found one Maxwell pulse capacitor for $125 + shipping

What about four ceramic high-voltage transmission capacitors.  400pF @ 30KV.
I found those 4 for $30.

400 pF is way too small, and even with 4 in parallel, you'd be up to 1.6 nF, which is in the range, but an awful expensive way to go. You'd also want to make sure that these are real transmitting duty caps (what's the RF current rating).


 I will not be building any more tesla coils after
this one and don't really want to spend a fortune.  This is just for a
simple contest at work and has already gone way over budget.
The magnet wire for the secondary seems to be around $15 per pound and from
what I gather I'll need about 10 #s.

That is an enormous amount of wire for a small coil. Most NST powered coils will be less than a pound of wire. Say, 1000 turns on a 3" diameter form. That's 9.4"/turn or about 780 ft all told. A pound of AWG 24 magnet wire is about 800 ft. and is about 50 turns/inch (so the 1000 turns will be about 20 inches long) Surplus sales has Essex 24AWG at about $9/lb. http://www.surplussales.com/Wire-Cable/Wire6.html

  I believe 16 AWG is around 125 foot
per pound.

Holy cow.. 16AWG is way too heavy for a NST powered coil.



I appreciate the response.  I don't want to waste my money on junk but I
also don't want overkill.

Thanks
Malcolm