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What type of LED is this

Discussion in 'Datasheets, Manuals and Component Identification' started by Monsterenergy, Mar 20, 2012.

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  1. Monsterenergy

    Monsterenergy

    3
    0
    Mar 19, 2012
    I need to replace this LED. It does not emit any light when it works so I can assume it is infrared. It has a K9 on the side of it otherwise there are no numbers. Any help would be appreciated.
     

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  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,418
    2,788
    Jan 21, 2010
    This looks like it's from some fairly old equipment given all that gold...

    The issue with IR LEDs is that they come in several "colours" (wavelengths) and you may need to pick the correct one.

    Is this LED part of a pair of devices (a LED and a photodiode?) It may be worth considering replacing both because that way you can ensure you have a pair of devices that match up correctly.

    Alternatively, there may be more information on the photodiode (or phototransistor) -- but I wouldn't hold my breath.

    Alternatively again, you may be able to find a service manual or a schematic for the device and that may contain more information.
     
  3. Monsterenergy

    Monsterenergy

    3
    0
    Mar 19, 2012
    Thanks Steve. It actually is in a encoder that reads a scale. The scale is made of steel and the encoder travels across counting the lines. (25,400 per inch). It is manufactured by a company called Mitutoyo. This is there new style where as the last ones just used 5v lamps. Both will read the same scale.
     
  4. shrtrnd

    shrtrnd

    3,773
    493
    Jan 15, 2010
    The 1970's/80's way was the 5V lamp with an optical encoder. So this is probably
    newer than that. My dumb question is, did you contact the manufacturer, or do you
    have or can you get a schematic/manual on this instrument, and maybe find the full
    part number for the device?
     
  5. Sid723

    Sid723

    57
    1
    Jan 28, 2010
    If you think it is infrared, then how do you know it is defective?

    If you can apply power to the device, see if you can measure a voltage across it.
    If it has a voltage drop of around 1 to 2 volts, you can always try the old digital phone camera trick.

    With the infrared LED powered on, you can see it light up by looking at it through your phone camera. Most cameras will pick up infrared and will show up as a blue light on your digital camera.

    This way you can tell if the LED is indeed dead.
     
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