Op amp question

Discussion in 'General Electronics Chat' started by yeyeb, May 3, 2010.

  1. yeyeb

    Thread Starter New Member

    Nov 16, 2009
    Hello everyone, i am currently having the same problem. My op amp isn't generating negative part of the square wave coming from the sound port of my computer. Infact, although sounding ridiculous, i am using an analog multimeter to measure this and at 1Hz i don't see the needle staying at, lets say, 5V. It only changes in positive going tick (PGT) and goes to zero. You would probably say i shouldn't be using the signal generator form my comp but in any case can you explain why this is happening. Also how can i get my op amp to generate the negative part of my square wave? i am using inverting config with R2= 100,000ohms with R1=100ohms for maximum gain (gives me 0.7v input to 6v output) however going R2=1,000,000 ohms gives me 1v, i don't understand why.

    mik3, can you please post a circuit diagram of that and elaborate on what you mean by baising the non inverting input and why do you need to do that.
  2. Bychon


    Mar 12, 2010
    This is called, "hijacking a thread". You're supposed to start your own question.
  3. beenthere

    Retired Moderator

    Apr 20, 2004
  4. SgtWookie


    Jul 17, 2007