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Thread: New projectors with 445s, they never switch off?

  1. #1
    Join Date
    Jan 2008
    Location
    Cambridge, UK
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    312

    Default New projectors with 445s, they never switch off?

    My projectors, using either one of my FB3s, and with output disabled in Quickshow, show a faint blue dot. The seller has suggested this is an endemic problem with the diodes / drivers. True? BS? Fixable?

  2. #2
    Join Date
    Sep 2006
    Location
    Netherlands
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    1,411

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    The bias current is needed to achieve proper modulation response, and results in a faint lasing.

    You might want to consider a shutter.

  3. #3
    Join Date
    Apr 2006
    Location
    Miami, FL
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    3,580

    Default

    Quote Originally Posted by smokeAndMirrors View Post
    True
    pretty much every one I have seen does this... my 445 module does this... using a flexmod

  4. #4
    Join Date
    Feb 2008
    Location
    East Sussex, England
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    5,205

    Default

    Yep, even with as low as 10mA mine still LED. I can see it on my wal at home, but in a gig situation I couldn't see it even though i knew it was there and was looking hard for it.

    I find that having the bias low means that it matches the threshold for when my green starts lasing. Others like to have the bias just below threshold (~180mA) and get instant light

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