Problem with Howland circuit

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Discussion in 'The Projects Forum' started by krupa1711, May 23, 2017.

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  1. May 23, 2017 #1
    krupa1711

    Thread Starter New Member

    May 23, 2017
    4
    0
    Hi!
    I am making Howland circuit for getting constant current source.
    I am providing 100Hz 5v square wave as an input to the op-amp.
    Till yesterday I was getting perfect output current.
    But Today when I tried ...I am getting some constant DC component added in the output.
    I am not able to get why and how does it added in the circuit?
    Can anyone help me through this?
    Thank you in advance.
     
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  2. May 23, 2017 #2
    crutschow

    Expert

    Mar 14, 2008
    20,060
    5,650
    Sounds like a problem with the op amp.
    Can you try a different one?

    Post your circuit schematic with part values.
     
    #2 Reply
  3. May 25, 2017 #3
    hapedo

    New Member

    May 25, 2017
    3
    0
    I've been using e.g. TS922 for howland pump without issues. But better option is e.g. XTR111 that converts voltage to current.
     
    #3 Reply
  4. May 29, 2017 #4
    krupa1711

    Thread Starter New Member

    May 23, 2017
    4
    0
    Got the problem. There was the problrm with power supply I was giving to op-amp.The power supply was not working properly.
    Thank you.
    And sorry for the disturbance caused.
     
    #4 Reply
  5. May 29, 2017 #5
    crutschow

    Expert

    Mar 14, 2008
    20,060
    5,650
    Nothing to be sorry about. ;)
    Glad you found the problem.
     
    #5 Reply
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