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Re: [TCML] Tuning, Capacitors, and Spark Gaps
I never had much luck with toroids that large on a 30 ma transformer.
What you might want to try is to buy an 8" stainless steel gazing globe
for $20.00 either off an ebay seller, or Amazon. I would also take
enough capacitors out of your string so that the capacitance is around
.013uf, which should be a better value for your 9/30 nst. You should be
able to get at least a foot of spark with this arrangement.
Joel Torgeson wrote:
I've now built my tesla coil, and am very disappointed that it fails to work. My transformer is a 9,000v 30ma NST. I have tailor-built my capacitor out of capacitors from microwave ovens. They are internally resisted, and with 80 of them in series i hit my target capacitance of .0088 uf. My primary consists of 1/4 inch copper tubing spaced 1/4 inch between each winding. there are 15 turns of tubing in a flat pancake configuration. My secondary consists of approximately 760 feet of 24 AWG magnet wire wrapped around 3.26 inch outside diameter PVC pipe. The topload is of the tubing and pie-pan variety, using 3 inch aluminum tubing/ducting. This makes a ~ 15 inch toroid on the top. i am using a 8 ft grounding rod that isn't attached to anything important. There is no metal inside the secondary, so that isn't a problem. My biggest concern is the spark gap. It's a static gap, not split up into multiple gaps, just one big one. it is 5.6mm wide, and has a
hair drier running on cool temp, high velocity blowing on it for quenching.
There's all the numbers i have, now i need some advice. I have been trying to tune it in for 2 days, and all i can get is the occasional 3/4 inch spark (usually no more than 1/2 in for rapid sparks). It does light up a broken fluorescent bulb, and as i said, it makes some small sparks, but i didn't spend all that time and effort to create something my Van de Graaff can beat!
So, does anyone see anything obviously wrong? Any suggestions, comments, tips, or (yes) criticisms would be much appreciated.
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