What you need is here.
The Circuit is easy, so you don´t need a lot of parts. The main circuit is not my invention (but would be great ^^ ) if you are interested you can find the developer here
(german page)Tools:Soldering Iron and equipmentWiresParts:2x SCHOTTKY Diodes
2x Capacitors 2200µF/ 16V(you can use caps from 16 V on, but it is better if they make more Volts)
I used "AVAGO MOONSTONE LEDs" partnumber is: ASMT-MW62-NFH00
- > Some information for your LED-selection:
Our Driving-Circuit drives the current of the Dynamo to (low-cost-) LED-friendly 300-320 mA.
If you want to build it like I did: You can use 4 0,5W LEDs (2x2 parallel and the two pairs in series)
But you can also use 1 W LEDs (if you do so, you have to connect each LED in series. A Dynamo is able to drive ca. 3 1W LEDs)
In Addition you need a Dynamo. A HUB-DYNAMO is perfect.AND THAT IS ALL!
Sorry, if I don´t write how much it costs, because you can use desoldered material for the driver-circuit. The most expensive parts are the LEDs.