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How to make a small ground? Answered

I want to make a lightsaber from a 18w neon tube. I am using a 12v to 1800v inverter. The positive lead is connected at the bottom of the tube but in need a ground on the top without pulling a wire from the inverter.


.  You may be able to get away with using your body as the "ground", but that can be dangerous if your body becomes grounded.
.  For your application, I'd try running a very light gauge, varnish-insulated wire (more or less invisible when the tube is lit) down the side of the sword to the handle and make the connection(s) inside the handle.

if just the is connected it gives me a little light
I touched the negative lead and the glass of the tube and it lit up
but i will use a barely visible wire

If you wear rubber-boots and don't touch anything enough voltage will cause leakage through the air...


Is it really a neon tube or a florescent tube?

You have to make the connection. It doesn't draw much current so you should be able to run a very small wire to the connection that wouldn't be noticed.

On the other hand, at some ungodly voltage the neon tube will glow without any connection.