op amp 741

Discussion in 'General Electronics Chat' started by saeed_m, Jan 22, 2014.

  1. saeed_m

    Thread Starter New Member

    Jan 22, 2014
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    0
    hi

    I am new in electronic!!

    I want make a sound switch,so I use 741 op amp,but the problem is,my op amp's out put when there is no in put equal to my Vcc!!

    what I know about op amp is output equal to difference of inputs!!Am I wrong??I know about offset voltage but I don't think offset voltage equal to Vcc!!

    (my Vcc is 9volt and I use two different op amp for test but their respond is same!!)
     
  2. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,501
    380
    hi saeed,
    Can you post a circuit diagram showing how the 741 is configured.?

    A 741 should never pull up to Vsup.
    E.
     
  3. LvW

    Active Member

    Jun 13, 2013
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    100
    Saeed_m, of course we need your circuit diagram.
    More than that, do you know about negative feedback in conjunction with single supply operation? (I suppose you are applying single supply).
     
  4. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    In our days a 741 should never be used:rolleyes:
     
  5. MrChips

    Moderator

    Oct 2, 2009
    12,429
    3,360
    A 741 is a classic for teaching purposes but it is past its best due date.
    It is not designed to operate at 9V. Select a newer single supply opamp.
     
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