Help with schmitt trigger circuit

Discussion in 'The Projects Forum' started by isabelle, Feb 1, 2013.

  1. isabelle

    Thread Starter New Member

    Feb 1, 2013
    Hi guys!

    I really need help understanding this circuit. I just don't get it :( :(

    The fella's in my year have all tried to figure it out but they just don't get it either! :rolleyes:

    Thanks everyone!
  2. praondevou

    AAC Fanatic!

    Jul 9, 2011
    So this is homework , right?

    What part did you not understand?

    Divide the circuit in two parts, you can replace the voltage follower on the left with a variable voltage source if that simplifies things for you. So the only thing to analyze is the right opamp and the two resistors around it.

    Ask yourself what the resistors from output to + input does when applying different voltage levels on the 15k resistor. You could make a table with different voltage values...
  3. wayneh


    Sep 9, 2010
    Mapping what comes out versus what comes in is a tool with wide utility.
  4. isabelle

    Thread Starter New Member

    Feb 1, 2013
    Yep its homework, this is my worst subject :( Thank you so much :)

    Ah I'm not too sure what the buffer does in the circuit or what the 2k resistor near the potentiometer does?

    I kinda know how schmitt trigger works. Also PRAONDEVOU I don't know what a voltage follower is, could you explain this to me please?

    Thank you ;)