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Thread: blanking line issue

  1. #1
    Join Date
    Aug 2007
    Location
    Indianapolis, IN
    Posts
    196

    Default blanking line issue

    I just hooked up an, ahem... "inexpensive" 1W 445 laser to one of the projector assemblies I have.

    When I tested it alonethe blanking it seemed to be working reasonably well - 0v was on and +5v (via a switch) was off.

    I just connected the blanking line to a MediaLas USB box for testing and found that the blanking does not seem to work at all.

    It needs to be inverted, so I was going to cobble together something using an LM324N opamp, but before I do - is there a standard way of "matching" these inconsistencies between DAC and laser?

    Sometime ago I was having a discussion about this very problem where I was told inserting a 20K resistor in series seemed to help.

    This is the first time I've experienced it.

    Steve
    ---------------
    Steve's Website

  2. #2
    Join Date
    May 2010
    Posts
    22

    Default

    I've had this problem on a chinese ildasplit/showcard and it required a 10k pulldown resistor to work.

  3. #3
    Join Date
    Aug 2007
    Location
    Indianapolis, IN
    Posts
    196

    Default

    Thanks - I hooked up a single transistor inverter and that seemed to take care of it.
    ---------------
    Steve's Website

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