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Schmitt Trigger

Discussion in 'General Electronics Discussion' started by fx_7, Jan 13, 2016.

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  1. fx_7

    fx_7

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    Jan 13, 2016
    Hi all
    I have a flowmeter sensor which supposed to give square wave but output is a bit different therefore i decided to use a schmitt trigger to convert this signal to square wave.What do I need for this?What are the criterias that i need to consider?I searched on net and realized that i could do this circuit with 2 resistors and 1 omp-amp?

    Thank you
     
  2. Alec_t

    Alec_t

    2,887
    773
    Jul 7, 2015
    Welcome to EP!
    What is the flowmeter output spec? Volts? Open-collector? .....?
     
  3. fx_7

    fx_7

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    Jan 13, 2016
    flowmeter has a digital output let me put the manual ftb 1302 is mine
     

    Attached Files:

  4. BobK

    BobK

    7,682
    1,686
    Jan 5, 2010
    You could probably use a Schmitt trigger CMOS gate. What voltage are you using for supply?

    Bob
     
  5. fx_7

    fx_7

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    Jan 13, 2016
    I am using 12V for supply
     
  6. AnalogKid

    AnalogKid

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    Jun 10, 2015
    There are lotsa ways to do this. What parts do you have or have access too. Also, do you prefer to go with analog or digital parts?

    1. A CMOS 4093 or 40106 has some hysteresis built into the inputs, and pretty-fast square wave edges at outputs intended to drive other logic circuits.
    2. With an opamp (totem pole output) or comparator (open collector output), you have adjustable hysteresis you can tailor for greater noise immunity, but the outputs have slower rise and fall times.
    3. You can add resistors around regular or hysteresis logic gates to increase the hysteresis window similar to the opamp/comparator circuit while still having the faster output edges.

    ak
     
  7. fx_7

    fx_7

    4
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    Jan 13, 2016
    from your replies CMOS 4093 or 40106 seems easy, i can get that parts.Do you need this information but i am using NI 6229 bnc daq.Sensor has digital(counter) output so i have to go with digital parts
     
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