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Joule Thief Revisited Pt. 3 3.9V @ .5A (2 Watts)

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Another run on the Joule thief showing its output at 2 watts, running on an 18650 2.6Ah battery. My best 18650's are 4 amp hours. After 10 minutes or so that transistor was slightly warm to touch.. maybe 90F - but nothing to worry about, and no need for a heat sink.

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