Simple OpAmp question

Discussion in 'The Projects Forum' started by odinhg, Jun 25, 2010.

  1. odinhg

    Thread Starter Active Member

    Jul 22, 2009
    65
    15
    Hi, I need a +4VDC and a -4VDC reference voltages. They don't have to be very precise (+-500mV works).

    I've tried to use a TL072, where I first use a voltage divider to get ~4VDC, then invert it. But when I tested it the inverted amplifiers output was giving a voltage close to the rail voltage.

    I've attached a circuit diagram (It says TL082, but I tested with TL072).

    Thanks in advance!
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    Try to swapp pin 5 and 6 on U1B ;)
     
    odinhg likes this.
  3. odinhg

    Thread Starter Active Member

    Jul 22, 2009
    65
    15
    Oh, that was pretty embarrassing.. Think I'll need to get a new pair of eyes.

    Thanks t06afre!
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,764
    2,535
    Wait until you are over 50, then you will have a new take on that phrase.
     
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