Advertise on Bikeforums.net



User Tag List

Results 1 to 6 of 6
  1. #1
    Newbie
    Join Date
    Apr 2012
    Posts
    2
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    wiring for hub dynamo

    I have a shimano hub dynamo running an Edulux front light but trying to connect in a Smart TL267RG tail light (led). I can run either light but not the two together. It won't work either in series or parallel. Both lights are self earthing ie I use the frame to connect back to the dynamo. What is the way to do this please?

  2. #2
    Member
    Join Date
    Dec 2011
    Posts
    27
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Maybe try skipping the self earthing and run two dedicated wires to each light straight from the hub? With painted frames and road grime it's questionable how well most frames actually are at transmitting electricity anyways.

  3. #3
    coprolite fietsbob's Avatar
    Join Date
    Jun 2010
    Location
    NW,Oregon Coast
    My Bikes
    7
    Posts
    664
    Mentioned
    31 Post(s)
    Tagged
    0 Thread(s)
    Hub dynamos are usually alternators by now, so frame ground
    like the DC Union bottle dynamos of old is not applicable.

  4. #4
    Senior Member
    Join Date
    Apr 2006
    Location
    San Jose, CA
    My Bikes
    Bianchi San Remo - set up as a utility bike, Peter Mooney Road bike, Peter Mooney commute bike,Dahon Folder,Schwinn Paramount Tandem
    Posts
    1,824
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I am not familiar with the Smart tail light, but a hub dynamo puts out an AC voltage, and LEDs require a DC voltage. There needs to be some rectification that takes place. In the case of the Edulux headlight, there is a full wave rectifier built into the light - my guess is that the tail light does not have rectification built in, but relies on the fact that the LED by itself will provide rectification. I use the Supernova E3 headlight, which has a DC output from the internal rectifier to power an LED tail light.

    What you might try is to go to Radioshack and buy a "Full-Wave Bridge rectifier" It will have two terminals marked with a ~ and then two marked + and -. Connect the two marked ~ to the dynamo, in parallel with the Edelux headlight, and then connect the other two to your tail light - you may need to swap the polarity of the taillight to get it to work right....

    Mark

  5. #5
    Randomhead
    Join Date
    Aug 2008
    Location
    Happy Valley, Pennsylvania
    Posts
    12,564
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    most tail lights will take the dyno output directly. The E3 taillight is an exception, and I suppose it's possible that the Smart light also requires a special headlight. I couldn't see any instructions online, so it's hard to know for sure

  6. #6
    Senior Member
    Join Date
    Jul 2006
    Location
    beantown
    My Bikes
    '89 Specialized Hardrock Fixed Gear Commuter; 1984? Dawes Atlantis
    Posts
    704
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    The Edulux has a blade connector to attach the taillight wiring to, according to this:
    http://www.nabendynamo.de/produkte/p...e_Edelux_e.pdf

    I don't have either light myself...
    Good luck.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •