Hubgenerator With Halogen Bulb Modified to LED




About: Working as a wood/metal shop teacher for kids 9-12 years old. Restoring a old house and a Saab 95 V4 1975. Currently bad at making new ibles but will hopefully find time soon...

Modified the light for my bike, the old one gave good light but was boring and only shone forward. And it stopped glowing when the bike stopped.
The bike itself is o continously ongoing project, got it as a wreck from a friend this summer. I stripped away all the broken parts, replaced them and polished the frame a bit. A instructable on how to do that vill come later.

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Step 1: Copperwork

First we start with the copper. I chosed it because i like the material, i had som pieces laying around and its easy to work with.

The spoons handle was ripped off and the flanges rolled up. The piece of tube was cut of in the middle and flattened on one side.

Step 2: Cover for the Back Light

A piece of plastic is beeing sawed to the same diameter as the copper tube.
It could quite easily be bent by warming it with a candle and shaped over the back of a hammer.
Sorry for the missing picture, i dont show what the screw is fastened in. Its a piece of copper that goes all the way back to the hole.

Step 3: Electronics

A rectifier, voltage rgulator and a 0.47F capacitor to make the LEDs continue glow after the bike has stopped moving.
Nine bright light LEDs was taken from a discarded flashlight and melt-glued in the old reflector. The rear light has six red LEDs glued directly to the plastic cover.

Step 4: Ready

Mounted on the bike. Make sure the brake arm is securley fastened, if it gets lose the brake might fail.

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    11 Discussions


    8 years ago on Step 4

    And then, the glue comes off together with the paint)))))


    8 years ago on Step 3

    Although the 7805 will work, it is actually wasting power from your dynamo in the extra voltage drop it needs to work. It might be better to put a suitable zener across the output from the rectifier, or two back to back zeners across the generator. You could also use a diode chain to act as a zener, due to the fact that diodes will only turn on at a certain voltage, approx. 0.7v per silicon diode and 3A current diodes are relatively cheap and should be more than enough to do the job.


    Reply 11 years ago on Introduction

    Thanks, its actually another never-ending project... Its from ~1940 with bookshelfs on the front. I got my computer and amplifier built in where there used to be drawers on the right side. Heavy to move around but very nice and quiet. :-) The working bench is a gift from my grandfather, he is 93 now and a bit to stiff inte his hands to use any fine tools. And there is no cross-5 lacing on the back weel, just a trick of the eye.


    11 years ago on Step 4

    Wild cross-5 lacing on the back wheel, too!


    11 years ago on Introduction

    Have to try something like this on my mountain bike. Cool, functional and minimalistic. Btw. I have the exact same Velo saddle on my bike. Very comfy and sturdy for the price.