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Joule Thief Running SEC 15 & lighting 4w CFL.mov In this vide I have a Joule Thief running a SEC 15 and lighting a 4w CFL off a 1.5v AA battery. The transformer is from an old PC power supply. I have three small magnets on top of the transformer to help with oscillation. The BEMF from the JT is going into the big cap and running the SEC 15.