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Thread: Down with LEDs for the OBC

  1. #1
    Join Date
    Oct 2004
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    Honolulu
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    Default Down with LEDs for the OBC

    I was repairing a bunch of LED lamps for a Boy Scout camp and figure that I was tired of burnt out OBC bulbs, so I took apart some old bulbs and sockets and fit a reisiter and LED to it.

    Had to fiddle with the installation to get the polarity right, but they work.

    The only thing I'm not sure of is the dimming function...I think the voltage drop is too little for the LEDs.


    Vee ave vays of dealing vid your kind...........

  2. #2
    Join Date
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    Eastern Tennessee USi
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    Default

    as I understood the LED's either work or dont work mattering on voltage...interesting project tho!
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  3. #3
    Join Date
    Mar 2005
    Location
    dublin, ca
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    Default

    no... they dim as less current flows through

  4. #4
    Join Date
    Jan 2004
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    Calgary AB Canada
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    Default

    Quote Originally Posted by 632 Regal
    as I understood the LED's either work or dont work mattering on voltage...interesting project tho!
    The heater control/slider knobs are lit with LEDs and they dim. The dash light dimmer uses a PWM controller to change the duty cycle of the LED, dimming it and the incandescent lamps on the circuit:

    Datasheet for the PWM controller:
    http://us.st.com/stonline/books/pdf/docs/1408.pdf

    SMT components including the L9610C PWM controller:


    Power MOS transistor inside heatsink. Note the dimmer's icon is lit with an LED:
    Anthony
    03/64 production

    '91M5 - 11/90, was mine, it's Jim's now.

  5. #5
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    Default Yup..They do dim

    Took the car out & wife too, for a night on the town, and checked out how the LEDs looked.

    They do dim down, not instantly, but gradually.

    They seem to work well for the LCD backlight, but the function buttons are not well lit. do to the narrow beam from the LED.

    I guess I'll be using a bulb for the bottom and LEds for the sides.


    Vee ave vays of dealing vid your kind...........

  6. #6
    Join Date
    Jan 2004
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    1,342

    Default This is great info, drawings don't show it, just a reostat!!

    Javier

  7. #7
    Join Date
    Oct 2005
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    518

    Default

    One way to get a more diffused light pattern from LEDs is to roughen up the exterior. When I installed LEDs in my sunroof and A/M switches, I actually shaved the LEDs at specific angles. That seems to have worked quite well for directing the light in the proper places. Hope this helps.

  8. #8
    Join Date
    Jan 2005
    Location
    Melbourne Australia
    Posts
    326

    Default

    whats the procedure for removing the obc to get to the globes, what globes do you need. i want to do it all at once, not pull it appart, find i cant get the globes and have to put it back together to pull it apart againg when i get the globes.
    1994 540i Auto

    live fast; die sideways
    13.3 @ 104mph (not in the 540)
    15.4 @ 150 Kph in the 540 (24/9/07)

  9. #9
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    Jan 2005
    Location
    Melbourne Australia
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    Default

    let me save evry 1 the hassle, RTFM. for removal. dosent say what spec the globes are....
    1994 540i Auto

    live fast; die sideways
    13.3 @ 104mph (not in the 540)
    15.4 @ 150 Kph in the 540 (24/9/07)

  10. #10
    Join Date
    May 2004
    Location
    Japan
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    9,249

    Default

    BMW part nos of original bulbs:
    64 11 1 382 790 Bulb "Rot"
    64 11 1 388 253 Bulb "Weiss"

    But I do not know the Watt.

    How to disassemble
    http://bmwe32.masscom.net/johan//IHK...KA_lights.html

    That is now for the IHKA bulbs.

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