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Thread: Blanking ?

  1. #1
    Join Date
    May 2006
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    Norway, Fauske
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    Default Blanking ?

    I have taken apart a lasershow system.
    I wounder this powercard has blanking? See sircle at picture.



    Anyone knows ?

  2. #2
    Join Date
    Feb 2005
    Location
    Switzerland
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    It can be... On my laser power supply blanking input similar to the one in your picture.
    You can test it by applying 0V or 5V, but I don't know if this can broke something if it isn't a blanking input...

  3. #3
    Join Date
    Jun 2006
    Location
    Charlotte, NC
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    Default

    That is the blanking plug, i am 100% sure of it as I have a couple of those boards laying around.

    The blue pot is to turn the current up but beware. Most of these diode are already on their breaking point.

  4. #4
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    Default

    Thanks!

  5. #5
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
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    Default

    I would suggest optocoupling the input of this.....

    See here for a rough and ready circuit that works with these boards:

    http://www.members.optusnet.com.au/d...reen150red.pdf

    You will be able to tell the negative pin, as it connects to the ground plane of the board..

    Hope this helps,

    Dave
    KVANT Australian projector sales
    https://www.facebook.com/kvantaus/

    Lasershowparts- Laser Parts at great prices
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  6. #6
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    Default

    Thanks again!!

  7. #7
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    Jan 2006
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    Charleston, SC
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    Dave;

    Would you suggest using that specific opto-isolation circuit with ANY TTL blanking, or only with the specific board cruch mentioned? In other words, is that board especially suceptible to damage from the TTL input, or is it common with all drivers that the pump diode could be damaged by a malformed TTL signal? Just curious...

    Adam

  8. #8
    Join Date
    Nov 2005
    Location
    Melbourne, Australia
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    Just with this board.

    The blanking is pretty dodgy with no degree of isolation, so that little circuit provides a bit more safety for the diode
    KVANT Australian projector sales
    https://www.facebook.com/kvantaus/

    Lasershowparts- Laser Parts at great prices
    https://www.facebook.com/lasershowparts/

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