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  • MarkP188 commented on 1up's instructable Make a Joule Thief3 years ago
    Make a Joule Thief

    Would it be better to use a N channel MOSFET in place of the NPN bipolar transistor? There's usually a 5V reverse bias limit on the base-emitter junction, a FET could allow more negative voltages on its gate (e.g with a. lower turns ratio), plus it's more efficient because there's no saturation voltage drop. I guess you'd also have to watch that the steady state (DC) condition of the transistor being on permanently which could short the battery, but a nice little circuit!

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