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10601604 3B7216F6Cc MAntonOlsen writes “This is an easy to build dc-dc switcher that can drive quite a few LEDs at 3.3V with a single AA battery. Version 1 is going in a mini mag light and I’m thinking version two will make a very light weight bike light.” [via & instructions] Link to photos.

Phillip Torrone

Editor at large – Make magazine. Creative director – Adafruit Industries, contributing editor – Popular Science. Previously: Founded – Hack-a-Day, how-to editor – Engadget, Director of product development – Fallon Worldwide, Technology Director – Braincraft.



  1. Fub says:

    It’s a pity that the MAX756 is outdated – none of my regular online electronics shops carry it. The improved versions are all very, very small which makes it hard for the casual hobbyist to create this circuit.

  2. cnuwer says:

    The ‘LED Museum’ has been around for a long time for those integrating LED’s and flashlights. Worth a look, if you have not seen it…

  3. nil0lab says:

    Fub: they can’t be that old, doesn’t seem to carry them. Looks like MAX756CSA+ is current:

    Perhaps you were hit by a temporary RoHS (lead-free) changeover issue.