Schmitt Trigger Help

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

  1. Alex8850

    Alex8850

    Joined:
    Dec 7, 2016
    Messages:
    6
    Likes Received:
    1
    Hello,

    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.

    Alex

    Capture.PNG

    Capture2.PNG
     
    Alex8850, Mar 19, 2017
    #1
    1. Advertisements

  2. Alex8850

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Joined:
    Jan 21, 2010
    Messages:
    23,320
    Likes Received:
    2,131
    Location:
    Mid way between Beijing and the Ronne Ice Shelf
    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.
     
    (*steve*), Mar 19, 2017
    #2
    1. Advertisements

  3. Alex8850

    Laplace

    Joined:
    Apr 4, 2010
    Messages:
    1,235
    Likes Received:
    177
    Location:
    Tombstone, Arizona
    The Motorola datasheet provides several relevant examples.......
     

    Attached Files:

    Laplace, Mar 19, 2017
    #3
  4. Alex8850

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Joined:
    Jan 21, 2010
    Messages:
    23,320
    Likes Received:
    2,131
    Location:
    Mid way between Beijing and the Ronne Ice Shelf
    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.
     
    (*steve*), Mar 19, 2017
    #4
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.