Problem with Howland circuit

Discussion in 'The Projects Forum' started by krupa1711, 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.
     
  2. crutschow

    Expert

    Mar 14, 2008
    19,538
    5,445
    Sounds like a problem with the op amp.
    Can you try a different one?

    Post your circuit schematic with part values.
     
  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.
     
  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.
     
  5. crutschow

    Expert

    Mar 14, 2008
    19,538
    5,445
    Nothing to be sorry about. ;)
    Glad you found the problem.
     
Loading...