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
this is what i want to design

 

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?

 

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?

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

 

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

 

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

thanks... but, can i change to other kind of opamp? im not smart on electronic....

 

Smart enough to google simon bramble?

 

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:



Get mine running first, then you can modify it to reflect your circuit.

 

thanks... but, can i change to other kind of opamp? im not smart on electronic....

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

 

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

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....

 

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

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.

 

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....

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

 

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

how about you sir??

 

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

 

how about you sir??

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

 

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
View attachment 84142

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

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

sir, im not cheating

 

sir, im not cheating

Well, is this school work of any kind?

 

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?

 

Well, is this school work of any kind?

hard to explain... but sir, believe me im not cheating

 

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

Anyway here is the asy file.

 

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?

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...