It is very important to have lights on your bicycle but it can be very boring to replace those batteries. A classic bike dynamo has a few disadvantages such as slowing down the bike and making excessive noise while rubbing off of a tire. There are contactless dynamos, but why buying one when you can build one yourself?
This bicycle light is made out of three LEDs and a charge capacitor. It is powered by a DIY contactless dynamo made from a relay coil and some hard drive magnets. The circuit is constructed so that one LED is kept steady on while driving and the other two blinking.
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