Unfortunately dynamos seem to be forgotten by many modern cyclists. I'm not going deeper into reasons of this situation - instead I'm going to show You bicycle LED light that works better than many of commercially available battery (an dynamo) powered ligts.
The advantages of dynamo powered bicycle LED light:
- lots of light!
- always available - You can not forget to take it with You
- unlimited burn time
- no cells, batteries, chargers (think of costs and environment)
- unattractive to thieves.
I use this light for daily bike commuting since one year. The instructable misses some photos, because I didn't took many when I was building the light :) The circuit idea comes from the page http://pilom.com/BicycleElectronics/DynamoCircuits.htm