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.

 

Sounds like a problem with the op amp.
Can you try a different one?

Post your circuit schematic with part values.

 

I've been using e.g. TS922 for howland pump without issues. But better option is e.g. XTR111 that converts voltage to current.

 

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.

 

Nothing to be sorry about.
Glad you found the problem.