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Photodiode or Phototransistor

Discussion in 'General Electronics Discussion' started by colum, Dec 24, 2014.

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  1. colum

    colum

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    Jul 25, 2013
    I bought a 3mm Ambient light sensor at Radio Shack the lens is clear and a long and short leg there is no circuit description and some of the folks say its a Phototransistor. From some description of the difference is that Photodiode has a Collector to Base circuit and the Emitter is the Light receiver and in the Phototransistor the Base is the Light receiver.
    I want to use this as a Light detector from a Fiber optic cable.

    I would appreciate any help I can get, thanks be well and Merry Christmas and Happy Holidays..colum
     
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    Merry Christmas to you too :)

    a photodiode is just a diode --- it has an anode and a cathode

    diodes of any type DONT have collectors, bases or emitters .... transistors do

    Dave
     
  3. colum

    colum

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    3
    Jul 25, 2013
    Thanks Dave your response is appreciated. The old books I have represent Photodiodes as having a C to B and E as the light sensitive element, I'm going to toss these old books they are misleading....colum
     
  4. davenn

    davenn Moderator

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    Sep 5, 2009
    yeah just a little misleading

    That is a phototransistor :)
     
  5. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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    Nov 28, 2011
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