and again...a Joule Thief!

This time I use a small SMPS Transformer, you can also buy a kit for this circuit, including battery holder, a battery, LEDs, a transformer, a proto board, and all required components.

you can find it on my ebay: http://stores.ebay.com/pic-hitechworld

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The way of using the 3 transformer windings isnt straightforward, I had to experiment a bit (there are 3 windings). In the end, I connected most of the LEDs accross the transistor, and a few on one of the windings, and the third winding is used as feedback.

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