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Thread: SOB advice. Thanks.

  1. #1

    Default SOB advice. Thanks.

    Hi, been a while since I was in here. I wired up a new SOB917 into my EDC last night (Surefire L5 w/extension to make it hold 2 x 18650 AW batteries). The old board lasted a long time. I had a spare one on hand.

    Anyway, it only draws about 400 ma when hooked up to my power supply set on 8 volts, which is roughly the voltage of my battery pack fully charged.

    I've gone over everything. I installed new wires. I thought maybe the emitter was bad (Cree XR-E WH tint) so I desoldered the board and wired it to a new emitter. Same thing, ~400 ma and low light.

    What do I need to look for?

    Many thanks!
    Blew another IC!

  2. #2

    Default Re: SOB advice. Thanks.

    Verify the sense resistors are correct on the SOB917. It's drawing 400mA from the power supply and the LED has low output?

    Wayne

  3. #3

    Default Re: SOB advice. Thanks.

    Quote Originally Posted by dat2zip View Post
    Verify the sense resistors are correct on the SOB917. It's drawing 400mA from the power supply and the LED has low output?

    Wayne
    I checked that against the values on your site. I don't have the board in front of me but the resistors were correct.

    Yes, drawing about 400 ma and low output.

    Thanks Wayne.
    Blew another IC!

  4. #4

    Default Re: SOB advice. Thanks.

    Post deleted.
    Last edited by Justin Case; 06-03-2013 at 06:18 AM.

  5. #5

    Default Re: SOB advice. Thanks.

    It's not a Lux V, it's a Cree XR-E. Vf is ~3.2 volts.
    Blew another IC!

  6. #6

    Default Re: SOB advice. Thanks.

    Post deleted.
    Last edited by Justin Case; 06-03-2013 at 06:18 AM.

  7. #7

    Default Re: SOB advice. Thanks.

    The setup is at home. I'll recheck the Vf on it again tonight, but the emitter isn't the issue.

    I wired this board exactly like the old one. I bought two of these at the same time. Used one, it lasted for a few years and gave good service. When it finally went out I put my spare in.
    Blew another IC!

  8. #8

    Default Re: SOB advice. Thanks.

    Post deleted.
    Last edited by Justin Case; 06-03-2013 at 06:18 AM.

  9. #9

    Default Re: SOB advice. Thanks.

    Quote Originally Posted by Justin Case View Post
    What I meant was that it appears that the LED is not getting the expected 917mA nominal drive current, based both on low output and Vf.

    Exactly.



    The board is wired correctly. The sense resistors are there and are the correct value.


    Is there anything else it could be? I was just wondering if anyone has experienced this problem with this board and had some advice.
    Blew another IC!

  10. #10

    Default Re: SOB advice. Thanks.

    Post deleted.
    Last edited by Justin Case; 06-03-2013 at 06:18 AM.

  11. #11

    Default Re: SOB advice. Thanks.

    No.

    LED+ is soldered to J5.

    LED- is soldered to J6.

    The board sits in a P60 drop-in and the outer ring is soldered to the brass pill.

    This is the pill:



    Mounted in the light:

    Blew another IC!

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