pin details of moc7811

Discussion in 'The Projects Forum' started by twinkletom, Jan 15, 2009.

  1. twinkletom

    Thread Starter New Member

    Jan 15, 2009
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    Hi iam using moc 7811 in my project.
    On that, a diode symbol and CE are mentioned. How can i use this can anybody help me.
     
  2. SgtWookie

    Expert

    Jul 17, 2007
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    If you pass 20mA of current through the diode (which is an infrared LED) and the slot is not blocked, then the transistor will turn on. If the slot is blocked, the transistor will turn off.

    C is the collector, E is the emitter.

    Here is one way it could be used:
    [​IMG]
    R1's value is a guess, as I'm not certain of the IR LED's Vf; but it should be safe.
    R2 will limit current through the transistor to less than 5mA.
     
  3. twinkletom

    Thread Starter New Member

    Jan 15, 2009
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    0
    thank you. does the same can be used for 4N35 (optocoupler)
     
  4. SgtWookie

    Expert

    Jul 17, 2007
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    Yes; actually I used a 4N25 optocoupler model and simply re-named it as the MOC7811. I adjusted the pin numbers to be correct for the latter.
     
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