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You are here: Home / Topics / Phototransistors

Phototransistors

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Electronics › Electronics › Phototransistors

  • This topic has 3 replies, 4 voices, and was last updated 13 years, 2 months ago by AJISH ALFRED.
Viewing 4 posts - 1 through 4 (of 4 total)
  • Author
    Posts
  • June 30, 2011 at 2:43 pm #1025
    Hafiz saleem
    Participant

    I bought some “Phototransistors” for a IR detection circuit. But i tried many ways to impliment a comparator circuit using LM324. But then i noticed that the Phototransistor emits light(it glows green). Then i tried the others aswell. most of them were glowing green while 2 were glowing red and one was IR(i used a camera for that). So, is it normal for a phototransistor to glow?

    July 2, 2011 at 3:30 pm #6413
    sourabh
    Participant

    if you want to detect IR only then you can use photodiode. if you want a higher range use TSOP sensors. And are you sure that you have used phototransistor, usually they don’t emmit light. If it is so please mention it.

    November 8, 2011 at 12:35 pm #6815
    srinu
    Participant

    if u want check the IR TRANSMITTER, u can use Any normal camera like mobile camera…

    April 18, 2012 at 8:10 pm #7492
    AJISH ALFRED
    Participant

    As far as i know it is impossible. You might have got the wrong component from the shop. Could you please share the part number and image of the component.

    For a simple ir detection circuit you can use ir led and its compactable ir photodiode, commonly called “led receiver” in electronics shops

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