Help with 741 opamp

Discussion in 'General Electronics Chat' started by stevejnr, Sep 21, 2011.

  1. stevejnr

    Thread Starter New Member

    Sep 8, 2011
    Hi folks

    I'm trying to create a voltage increase circuit using the 741 op amp in a non inverted configuration. This is the first curcuit I've ever made so I'm a complete novice...

    So, I've got a small question. When I hook the op amp up to the supply, using a 12v dc computer supply with the GND/-12v?? connected to pin 4 and the +12v to pin 6 the volatage going in to pin 6 is 12.15V. However there is an output voltage on pin 6 of 11.53. Is this the correct characteristics of the opamp? How would I make the output 0, so that only the voltage I'm trying to increase is on the output?
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    Can you make a drawing of your setup. Need that to say what is wrong.
  3. MrChips


    Oct 2, 2009
    You need a dual power supply, +12V and -12V.
    Or replace the 741 opamp with one that will work on single supply, try LM324.
  4. SgtWookie


    Jul 17, 2007
    Hi stevejnr,

    Sounds like you have the pins confused Pin 7 is the V+ supply, and pin 4 is the V- supply.

    Here's an example circuit that is a "voltage follower"; basically, you get out what you put in:

    If you want to increase the amplitude of the input signal, you use divided feedback with resistors. This is explained in our E-book, here: