Earlier in the week they showed you how to make a bike exhaust tailpipe to amplify the card in the spokes.

The second bicycle themed summer Maker Camp session from Makezine and Google+ goes live Saturday, July 13, at 11am PT/2pm ET on Makezine’s G+ page. They’ll offer live Q&A for the project there, or you can grab the project details from their website and do it on your own time. No, it ain’t pretty, and perhaps not even all that efficient, but it’s as much about learning as it is actually making the thing. Which might help you figure out ways to hack existing dynamos (like this and this) to suit your own needs.

Check the video below to see how it works…


  1. If your this guilty about the purchase of your cellphone and also hate going fast on a bike just move to India and go on a pilgrimage: the rest of us a’int ever using this kinda thing

  2. That particular style of generator is a terrible energy sink – from your legs. You have to keep pedaling, even downhill to keep your speed up.

    No doubt, the inefficiency comes from being mounted perpendicular to the wheel rotation. Seems to me that a more efficient generator could be built with a drive wheel that drops directly onto the tire (like a Solex motor) and a small belt drive or nylon gear to turn a generator that turns on an axis parallel to the wheel axle. Moreover, the power need of an electronic gadget is pretty small compared to the standard flashlight bulb at the heart of the bike lamp.

    I would build one myself but I really don’t have the time to squander on a Kickstarter campaign and all the social media updates.

What do you think?