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Schmitt Trigger Help

Discussion in 'Electronics Homework Help' started by Alex8850, Mar 19, 2017.

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  1. Alex8850


    Dec 7, 2016

    As an assignment for an Electronics course, I need to implement a Schmitt Trigger using the LM311 comparator. However, I have no idea on how to connect both the transistor pins and the positive feedback resistor for the circuit to work.

    Thanks in advance for your answers.



  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Firstly, always sure the positive rail at the top, and the negative rail at the bottom.

    The next thing to do is to look up the LM311 datasheet and see what to do with those two outputs.

    Then you can do the normal magic to create a Schmitt trigger.

    Please feel free to discuss what you find with us to make sure you've got it right before moving on it you have any doubts.

    I should mention that it will possibly come down to there being two possibilities for the output configuration. Consider the difference between them and whether it makes a difference in your circuit.
  3. Laplace


    Apr 4, 2010
    The Motorola datasheet provides several relevant examples.......

    Attached Files:

  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    I found the examples in the TI datasheet to be clearer. Looking at both datasheets will give you a better idea of what's going on.
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