Pspice

Discussion in 'Electronics Resources' started by beem, Oct 23, 2013.

  1. beem

    Thread Starter New Member

    Oct 23, 2013
    6
    0
    I have a big problem with pspice software. I don't know how to modify 2 pins
    of op amp 741(pin 5 & 1). I have to use them in my circuits but they are
    unmodeled pins. please help me :(
     
  2. LvW

    Active Member

    Jun 13, 2013
    674
    100
    The PSpice symbol for the 741 type opamp contains two pins (1 & 5) which are NOT necessary. Leave these pins unconnected. (The symbol is used also for other opamps which need these pins).
     
  3. beem

    Thread Starter New Member

    Oct 23, 2013
    6
    0
    I can't do it. As I said before I should simulate a circuit that these pins
    have to be connected to the rest of the circuit. In fact these connections affect simulation result so I can't leave them unconnected.
     
  4. LvW

    Active Member

    Jun 13, 2013
    674
    100
    I really don`t understand. The real unit (hardware) has two pins for power supply, a differential input (two pins) and one ouput pin.
    What shall be the purpose of connecting the additional pins of the symbol to "the rest of the circuit"? WHY?
     
  5. beem

    Thread Starter New Member

    Oct 23, 2013
    6
    0
    thanks for your help. I need a transistor array which has 4 taransistors 2 NPN and 2 PNP for my design circuit .I can't find this kind of thing in Pspice libraries. I would be grateful if YOu tell me how I can find it
     
  6. crutschow

    Expert

    Mar 14, 2008
    12,977
    3,220
    Why not just use separate transistors? The simulation results will be the same.
     
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