harald eberhart teaches a class on plasma neon. he teaches you how to make them. they arent all that difficult: rf tansformer (of the right size), ac adapter , and some metal tape to increase the signal.
why don't you just buy one of the cheap battery powered plasma balls from wall-mart like this: plasma ball $12.95
...you could take it out of the plastic base,and make your own. Putting some metal tape on the wire to boost the frequency would be the move for larger peices.
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