Bike Forums - Dynohub Age and Use

Quote:

Originally Posted by gna (Post 9904763)

One wire on the bridge rectifier is marked with a + sign. Connect to the positive (+) lead of an LED. The wire opposite the + marked wire is the negative lead and connects to the negative (-) lead of the LED. The other two wires are connected to the dynamo and it makes no difference which one is connected to which lead.

What kind of Dynohub do you have? I don't think a S-A dynohub puts out 3 watts, but I could be mistaken. There are several circuits floating around, with various components and LEDs, in the electronics forum, so that may be a better place to ask.

Front dyno hubs typically put out 3 watts, the rear dyno hubs 2.4 watts. This is what I have found so far on the 5 dyno hubs I have.

Quote:

Originally Posted by AngeloDolce (Post 9904768)

The LED and bridge rectifier sound interesting, but I have some questions:

How do you connect the bridge rectifier to the dynohub and light? I can solder the connections easily enough, my question is that the bridge rectifier has 4 wires, while the dynamo and light have only 2. Does each wire on the light get connected to 2 contacts on the rectifier to avoid losing half the power?

If the LED is 1 watt and the dynohub puts out 3 watts, is this an issue (e.g. bulb life), or does the LED use only 1 watt and still puts out more light than older and less efficient 3 watt bulbs?

The LED only uses as much wattage as it needs to run, sort of like using a 40 watt or 60 watt light bulb in a lamp in your house. The advantage to using a lower wattage LED is that it will light up at lower speeds and will not require as much resistance out of the dyno hub.

Aaron:)