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Georgie 09/05/2019
Works well after some experimenting with the primary coil wire. If led 2 lights up (power) but led 1 doesn't don't give up, check your coil connections and reposition the primary coil wire. You should glue down the secondary coil (L2) and use only one turn (maybe 1.5 or 2) of the primary coil wire (L1) near the bottom (but not so low that it's below the secondary windings). Try both winding directions to see what works best. Before soldering the fine secondary coil wire carefully scrape the enamel off the very end with a small piece of folded sandpaper. I cut the primary coil wire leaving just a short piece long enough for one turn but then it didn't work as well (oscillations mostly stopped), went back to the longer piece of wire. So don't cut, bunch up the extra wire and leave it hanging to the side. With an old 15V laptop power supply I get about 5 mm of spark and the neon bulb lights up 8 cm away (3 - 4 inches). Only run it for about a minute at a time because one of the transistors gets very hot.
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