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Thread: 445nm specific PBS cube GB

  1. #51
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    Nov 2005
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    Dave: 10pcs
    LaNeK: 2pcs
    Kovacika: 2pcs
    Bradfo69: 2pcs
    dsli_jon: 4pcs
    danielbriggs: 2pcs
    Insanity: 2pcs?
    zetist: 16pcs
    buffo: 2pcs
    hitekvoop: 2pcs
    Displaser: 2pcs
    uamdme2: 2pcs
    polishedball: 1pcs
    Laser_Kiev: 6pcs ( 10mm )
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  2. #52
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    Jun 2011
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    I can get these fro 25us each

  3. #53
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    Dec 2007
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    Dave,
    When do you plan to close this out and require the wonga?
    Dan
    - There is no such word as "can't" -
    - 60% of the time it works every time -

  4. #54
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    Nov 2005
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    Hey Dan,

    I sent 2 testers out - One to Buffo, one to platinum.... That was a while ago now - waiting on their findings before I do anything... Applogies for taking my time here, but i would rather everyone get awesome cubes..
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  5. #55
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    Dec 2007
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    Jolly good.
    No rush here; just curious .
    - There is no such word as "can't" -
    - 60% of the time it works every time -

  6. #56
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    Aug 2007
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    Portland
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    Quote Originally Posted by dave View Post
    Hey Dan,

    I sent 2 testers out - One to Buffo, one to platinum.... That was a while ago now - waiting on their findings before I do anything... Applogies for taking my time here, but i would rather everyone get awesome cubes..
    Yeah, I keep putting that off due to logistics. I intend to give the cube I have a good blasting this week sometime.


    - J

  7. #57
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    Jan 2006
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    Quote Originally Posted by dave View Post
    I sent 2 testers out - One to Buffo, one to platinum.... That was a while ago now - waiting on their findings before I do anything...
    I got mine. Unfortunately, when I hooked up the diodes to test, my last remaining Flexmod decided to shit the bed. (That makes 3 dead drivers now - grrr!)

    Waiting on a replacement (not a Flexmod!) to arrive before I can start testing. Need to be able to drive 4 of the M140 diodes (series-parallel arrangement) at around 2 amps each in order to get enough optical power onto the faces of the PBS to really do a good stress test.

    Adam

  8. #58
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    Quote Originally Posted by buffo View Post
    I got mine. Unfortunately, when I hooked up the diodes to test, my last remaining Flexmod decided to shit the bed. (That makes 3 dead drivers now - grrr!)

    Waiting on a replacement (not a Flexmod!) to arrive before I can start testing.
    Sounds like you're about ready to try this:
    http://www.repairfaq.org/sam/laserdps.htm#dpsldd317

  9. #59
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    An LM317 can't pass enough current to power 4 of the M140 diodes. I've built a few of the other drivers that are listed in the FAQ, including one with a passbank, but I never really liked the performance of any of them. I don't want to risk $200 worth of diodes on one of those designs. I'd rather wait for a proper driver with really good current control. (I'll be pushing these M140's pretty hard in order to stress-test the faces of the PBS, but I don't want them to die, since after the test is complete I plan to use them in a pair of projectors I'm building.)

    Still, thanks for the suggestion!

    Adam

  10. #60
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    Quote Originally Posted by buffo View Post
    An LM317 can't pass enough current to power 4 of the M140 diodes. I've built a few of the other drivers that are listed in the FAQ, including one with a passbank, but I never really liked the performance of any of them. I don't want to risk $200 worth of diodes on one of those designs. I'd rather wait for a proper driver with really good current control. (I'll be pushing these M140's pretty hard in order to stress-test the faces of the PBS, but I don't want them to die, since after the test is complete I plan to use them in a pair of projectors I'm building.)

    Still, thanks for the suggestion!

    Adam
    Study the text. You'll be surprised what is possible with that one. Even the LM317 data sheet shows that you can gang them. And with the LM338, directly compatible in this case, you might not even need to do that. As to risk, try it on something less important, then when you see how that behaves (Sam Goldwasser has seen one of these, and saw no problems in his test), you can try it on something else. You'll never know if you don't try, but you DO know that a driver you trusted failed you, several times. So try this one, don't dismiss it until you have. You clearly DO dismiss it, as not a 'proper driver' with proper current control. As the datasheet shows, an LM317 is a specialist in current control, it's part of how it works... There's a thread on this forum somewhere with someone building one. He thought it was wrong until he discovered some error in his work, and when that got fixed he seemed happy enough.

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