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Thanks.

Yes. Actually, if there was a lot of interest, this wouldn't be too hard to make en masse as a more legit pcb design.

<r>I tore a ferrite toroid off an old motherboard and used some enamel magnet wire (30 AWG), 20 turns on each side.<br/> Make sure you reverse the turns for the sides!<br/> For the transistor I just picked the super common BC547B transistor. You should be able to use just about any small signal NPN ...

<r>Using the circuit here: <URL url="http://en.wikipedia.org/wiki/Joule_thief">http://en.wikipedia.org/wiki/Joule_thief</URL><br/> <br/> I screwed a AA holder to my TrackClip pro, and it runs well on one 1.2v AA NiMH rechargeable cell. I was able to fit all the electronics inside the clip itself, so...