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Photodiode or Phototransistor

colum

Jul 25, 2013
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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
 

davenn

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Sep 5, 2009
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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
 

colum

Jul 25, 2013
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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
 

davenn

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Sep 5, 2009
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The old books I have represent Photodiodes as having a C to B and E as the light sensitive element

yeah just a little misleading

That is a phototransistor :)
 
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