Photosensor and IR LED

Discussion in 'General Electronics Chat' started by Voltboy, Jul 20, 2009.

  1. Voltboy

    Thread Starter Active Member

    Jan 10, 2007
    197
    0
    Hello.
    I'm looking to match an IR LED with a phototransistor. I have some QSE113 and maybe I would only need to order the LEDs. QSE113 is from Fairchild Semi and it says the matching emmiter is QEE113, but the datasheet of the QEE113 says the wavelength is 940nm, while the QSE113 wavelength is 880nm. Do this actually match?

    Thanks,
    Leon
     
  2. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
    40
    Figure 1 on the datasheet of the phototransistor, QSE113, gives a graph of Light Current versus Radiant Intensity with a GaAs light source. The matched emitter, QEE113, is a GaAs light source. The phototransistor responds over a much wider range than the emitter, and 880nm is just the peak response frequency. They unfortunately left out the graph of its response to different wavelengths.
     
  3. Voltboy

    Thread Starter Active Member

    Jan 10, 2007
    197
    0
    To avoid ordering the wrong piece and having to wait another weeks I ordered a QRD1114 which is a reflective photosensor, and its basically what I need to build my line follower robot.
     
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