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IR LED testing

Discussion in 'Electronic Basics' started by Uriah, Apr 26, 2009.

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  1. Uriah

    Uriah Guest

    I am testing some infrared LED transmitters and receivers and am not
    sure about a few things. Are all IR LED Transmitters the same color?
    I have some from one game that are dark blue and then from another
    game they are white. Each set has an opposite dark blue or clear
    white receiver or transmitter. I am using an old Radio Shack detector
    which is a flat card 1"x2" It glows when it detects a IR signal.
    When I hook up the dark blue ones on one system it will glow and the
    corresponding part across from won't when hooked into a LED tester.
    (Those little square ones from China) Then when I hook up the white/
    clear one from the other system it will show a glow on the radio shack
    card and their corresponding blue ones won't. Can a transmitter be
    dark/blue in color OR white/clear in color??

    What is the failure pattern? Can they get weak? Is that common? Or
    do they just fail. Is there a proper way to test these things? Has
    anyone seen pocket test instrument that can show an IR signal and test
    the receiver? The radio shack one I have is falling apart. Also, In
    general how do you usually choose these things. Are some for 3V, 5V
    or 12V. If I want to replace a transmitter or receiver and I don't
    have any manual how would I find the right one? AND, How do you tell
    from looking at the component what it is? That is a lot of
    questions.

    Thanks for any and all help.
    Russ
     
  2. Rich Webb

    Rich Webb Guest

    Most digital cameras will be IR sensitive, at least enough to respond to
    a bright source like a close-by LED. Try your cell phone camera.
     
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