help,, im newbie and need master of ltspice

Discussion in 'The Projects Forum' started by LzanBagus, Apr 16, 2015.

  1. LzanBagus

    Thread Starter New Member

    Apr 16, 2015
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    i have task to design butterworth band pass filter, but once i design it, it doesnt work.. i dont know what my fault.... i try to upload my design... please tell my fault and complete my design..
    sorry, i still improve my english example.png
    this is what i want to design example.png example.png example.png
     
  2. Papabravo

    Expert

    Feb 24, 2006
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    Doesn't work is not a very helpful description of what is going on. What precisely doesn't work? The circuit? The simulator? The Windows Operating system?
     
  3. LzanBagus

    Thread Starter New Member

    Apr 16, 2015
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    sorry, when i run it and there is a error box
    Unknow subcircuit called in:
    xu1 nc_001 n006 n004 n010 n002 opamp
     
  4. Reloadron

    Active Member

    Jan 15, 2015
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    The opamp you are using, a TL084 is not part of the standard LtSpice library. Have you loaded it in the library? Since you mentioned LTspice I suggest you watch this video.

    Also read this thread in these forums.

    Ron
     
  5. LzanBagus

    Thread Starter New Member

    Apr 16, 2015
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    thanks... but, can i change to other kind of opamp? im not smart on electronic....
     
  6. atferrari

    AAC Fanatic!

    Jan 6, 2004
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    Smart enough to google simon bramble?
     
  7. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    The TL084 is not automatically part of the LTSpice library, and would have to be imported. I suggest you use the generic opamp that is part of the default library as distributed. You are missing a lot of other bits to having a successful simulation session. I am uploading a running version of a simplistic simulation of an opamp circuit that you can use to get started:

    sample.gif

    Get mine running first, then you can modify it to reflect your circuit.
     
    Sinus23 likes this.
  8. Reloadron

    Active Member

    Jan 15, 2015
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    A Butterworth bandpass filter is not a good starting point for someone learning electronics. Yes, you can use other opamps but they need selected based on the application. Simon Bramble is, as mentioned above, an excellent reference on LTspice. There is no way what you need to know and understand can be covered in a single forum post.

    I see Mike has provided you something to work with, that should help.

    Ron
     
  9. LzanBagus

    Thread Starter New Member

    Apr 16, 2015
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    hey ron, please... if you are not busy, would you complete my design so i can run it? and then i can learn from it.... :)
     
  10. WBahn

    Moderator

    Mar 31, 2012
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    I don't find the reference designator 'xu1' in that ASC file you uploaded. This is looking for a subcircuit named 'opamp', which would need to be defined in a library file.
     
  11. WBahn

    Moderator

    Mar 31, 2012
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    And perhaps if he has enough free time, he can turn it in to your instructor for you, as well.
     
  12. LzanBagus

    Thread Starter New Member

    Apr 16, 2015
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    how about you sir??
     
  13. Sinus23

    Member

    Sep 7, 2013
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    Here is a functioning file but it's using a universal opamp so the results wont be exactly the same as if you were using TL084.

    And here is a cat;)
    SH4xPbV.jpg
     
  14. WBahn

    Moderator

    Mar 31, 2012
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    Sure, I'd be happy to finish it up and e-mail it to your instructor for you.
     
  15. LzanBagus

    Thread Starter New Member

    Apr 16, 2015
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    thank you sir, my ltspice couldnt find symbol for universal opamp, but now i know more little bit about ltspice.. thank you...


    sir, im not cheating :(
     
  16. WBahn

    Moderator

    Mar 31, 2012
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    Well, is this school work of any kind?
     
  17. Papabravo

    Expert

    Feb 24, 2006
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    See, the projects forum is for completed projects. This looks more like a homework exercise than a completed project. We could be wrong however. Why don't you tell us why you are working on a project using a design from a book? Or is it a coursepak from IMECS2009?
     
  18. LzanBagus

    Thread Starter New Member

    Apr 16, 2015
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    hard to explain... but sir, believe me im not cheating
     
  19. Sinus23

    Member

    Sep 7, 2013
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    You have TL084.asy but not universalopamp.asyo_O Is it not in you opamp folder because I'm 90% certain it came with the program.

    Anyway here is the asy file.
     
  20. LzanBagus

    Thread Starter New Member

    Apr 16, 2015
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    my teacher ask us to find refferences of butterworth BPF, and she want to us to design what on refferences we have.. the problem is no one in my class know how to use my ltspice, and when we ask our teacher, she said you must learn it for yourself or internet.. sorry i hard to explain... im not good at english...
     
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