PC817 Optocoupler-How Does it Work?

Discussion in 'The Projects Forum' started by seanbein, Feb 14, 2012.

  1. seanbein

    Thread Starter New Member

    Mar 16, 2010
    21
    0
    Can anyone explain to me how does a PC817 optocoupler works? referring to this circuit:
    http://www.fairchildsemi.com/an/AN/AN-9015.pdf
    page 5, can anyone explain to me about the pin 3 and 4 of the optocoupler?In which pin does the out put comes out?
     
  2. mcasale

    Member

    Jul 18, 2011
    210
    12
    These opto-couplers all work the same way, although the specs may vary. The LED provides light that activates the photo-transistor BASE (sort of). The output can be configured as common-emitter (most common) or common-collector. If the LED is turned off, the transistor turns off.
     
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