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This my second TEA laser, and although it isn't the best, it's still pretty cool. I have a video of it firing, and if I shot at a black piece of paper for minute or two, it would actually make a hole! It took me about 30 minutes to build and a couple hours to adjust the spark gap...

The dielectric is 4 sheets of .05millimeter paint-drop cloth, the capacitor plates are aluminum foil, the electrode is a s are aluminum v angle stock, and the power supply is a 2n3773 flyback driver. The electrod rails are readily firing but just not lasing. I have tried just about every rail...