AA joule thief LED flash light
prusaprinters
<p>Amazing circuit: Joule thief, build around a ferrite bead, running a 5mm LED from even flat AA batteries, down to 0.3V…</p><p>The circuit is self oscillating, mine is resonant at about 250Hz.</p><p>How to build the circuit, you can easily follow the video of Big Clive:</p><p>https://youtu.be/K53beWYdIpc</p><p>There is a little space in this print, taking the circuit, screwed together with two screws M3x12</p><p> </p>
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