Pspise error

Discussion in 'Homework Help' started by raham, Dec 27, 2009.

  1. raham

    Thread Starter Member

    Aug 18, 2008
    22
    0
    Dear All
    I'm trying to simulate a circuit in pspice but it gives such an error like "Less than 2 connections at node N00043", i have attached the circuit for you to look at, could you please let me know where my problem is??

    regards,
     
  2. kdillinger

    Active Member

    Jul 26, 2009
    141
    3
    I have seen the same (visual) error. I have received this type of error when the components being placed in the schematic entry do not have a PSpice model associated with it.
    When you are selecting components using the library there should be a symbol meaning it has a PSpice model. There is another symbol that means it has a footprint as well.
    I would upload screen shots, but PSpice is loaded on my work comp.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    You have wires attached to pins 1 and 5 of the 741 opamp, but nothing attached to the wires.

    In SPICE simulations, everything must have a path to ground.

    R3 and R4 are not necessary. In SPICE, the power supply is perfect, and thus unlimited.
     
  4. raham

    Thread Starter Member

    Aug 18, 2008
    22
    0
    i fixed them but still same error!!
     
  5. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    Do you have +V and -V actually connected or just annotated as your original diagram shows?
     
  6. raham

    Thread Starter Member

    Aug 18, 2008
    22
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    na not connected directly exactly as it shown in diagram
     
  7. raham

    Thread Starter Member

    Aug 18, 2008
    22
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    this is my current circuit
     
  8. raham

    Thread Starter Member

    Aug 18, 2008
    22
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    sorry ignore the previous circuit. this is the original circuit, but still the same error:(
     
  9. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    Is there a connector in pSpice that allows you to connect lines?

    I know there is one in TINA, as I use it all the time.

    Can you view the nodes so you can pinpoint the exact cause of the problem?
     
  10. SgtWookie

    Expert

    Jul 17, 2007
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    Attach your simulation file. You may have to .zip it up, or rename it to have a .txt extension. If you rename it, be sure to state what the original extension was.
     
  11. raham

    Thread Starter Member

    Aug 18, 2008
    22
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    this is the file, please find the relevant circuit its called new_741
     
    • new.zip
      File size:
      228.8 KB
      Views:
      16
  12. raham

    Thread Starter Member

    Aug 18, 2008
    22
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    i don't now!! I'm using this software for first time!! i used to use LTSpice
     
  13. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    I don't know where you got the UA741 model, but when I changed it out with the uA741 from the library, connected the batteries directly and everything worked fine.

    I changed the uA741 because there was an error ignoring the component.

    I used pSpice 9.1

    Attached are the pSpice files.
     
  14. raham

    Thread Starter Member

    Aug 18, 2008
    22
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    but i can not open it, i'm using orcad to open it
     
  15. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    I went back and looked at your schematic again. Open your old file and replace the UA741 with the uA741/eval from the library.

    It appears the +V and -V labels made the connection to the device.

    When I clicked on the two green donuts on your diagram, one was by the signal generator and the other by the UA741 ... the one by the signal generator said you didn't specify a frequency (but you did) and the other said there wasn't a template for the device (which is why I changed it).

    pSpice is orcad. You would have to unzip the files before attempting to open them.
     
  16. raham

    Thread Starter Member

    Aug 18, 2008
    22
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    can you prtscn it for me to look at please
     
  17. raham

    Thread Starter Member

    Aug 18, 2008
    22
    0
    i dont have uA741/eval in my library, can you send me you library pleaae?
     
  18. JoeJester

    AAC Fanatic!

    Apr 26, 2005
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    here are two pictures ...one illustrating the two green donuts I described ... and one with the pSpice results after changing the uA741
     
  19. raham

    Thread Starter Member

    Aug 18, 2008
    22
    0
    oh damn its looks fine but not in my pc, i dont know how i can fix it
     
  20. raham

    Thread Starter Member

    Aug 18, 2008
    22
    0
    how can i open that document you sent it, i unzipped it but i can see at all
     
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