I realy tried this question but still I am out of the answer. Please and please can you solve it?

 

hi,
Do you use LTSpice or Proteus simulator.?
E

 

hi,
Do you use LTSpice or Proteus simulator.?
E

I learned by myself both of them and yeah they are already downloaded my computer. Actually the teacher wanted from us this to do with by hand but if those softwares which you mentoned is required, then they are also ready for you ^^

 

hi,
Do you use LTSpice or Proteus simulator.?
E

I just dont know for making Op Amp circuits...

 

hi,
As this is Homework please post your best LTSpice attempt at answering the question, we can then help you.

E

 

hi cik,
We need to know the Voltages Va, Vb and Vc .??

E

 

hi cik,
We need to know the Voltages Va, Vb and Vc .??

E

The problem was not given those Va, Vb and Vc values.

I tried to design it via LTSpice and I have some problems on it.

Could you look at my design please?

Also I used"Universal Opamp 2" will it cause any problems or should I have been used LM741 or OP07?

Furthermore, I studied about noninverting summing amplifier design for that because it was wanted to make it as a non-inverting op-amp.

 

hi,
Without Va,b,c you cannot answer the question.

Post your LTSpice asc file.

E

 

hi,
Without Va,b,c you cannot answer the question.

Post your LTSpice asc file.

E

Just I've asked my teacher and he said that only he forgot to mention about Ra=20 kOhm and Rc=40 kOhm and gave them later.

Unfortunately, he literally doesn't accept that Va,b,c are missed... I meant he said it is possible to find them without knowing them with the help of simulation of ltspice. That statement confused me a lot...

Moreover, I attached my .asc file as you requested sir

E

Probably I put the place of "Vin" on the wrong wire. I was not quite sure about that.

 

hi,
Your teacher is incorrect it saying that Va,b,c and the currents ia, ib ,ic can be determined in using LTS, without knowing Va,b,c.

The actual values of ia,ib,ic depend upon the applied voltages Va,b,c
If Va,b,c are 0V then Vout of the OPA is also 0V.

If you wish, ask him to contact me and explain how he can solve this without Va,b,c.

E

 

hi,
Your teacher is incorrect it saying that Va,b,c and the currents ia, ib ,ic can be determined in using LTS, without knowing Va,b,c.

The actual values of ia,ib,ic depend upon the applied voltages Va,b,c
If Va,b,c are 0V then Vout of the OPA is also 0V.

If you wish, ask him to contact me and explain how he can solve this without Va,b,c.

E
View attachment 225533

I'm really appreciative of this evidence, now I'm gonna communicate with immediately to show his missed point...

I will inform you immediately sir, cheers

Edit

I sent him this issue and he will probably reply to me after one hour. I'll inform you, sir, in the evening.

 

The first step in the solution is to find the voltage at the "+" terminal.

 

The first step in the solution is to find the voltage at the "+" terminal.
View attachment 225535

That is right but the question did not give any details of their voltages...

 

hi RBR.
Using LTSpice as the teacher has suggested, there is 0V on the +terminal.
E

 

hi RBR.
Using LTSpice as the teacher has suggested, there is 0V on the +terminal.
E

He still did not reply to my message, I'm waiting for my teacher to answer about this issue.

 

Finally

hi RBR.
Using LTSpice as the teacher has suggested, there is 0V on the +terminal.
E

Finally, he replied to my mail. He said that we can give the values for Va, Vb, Vc whatever we want... ^^

 

hi,
Progress !!
Go ahead chose some values and post your LTS asc file.
E

 

hi RBR.
Using LTSpice as the teacher has suggested, there is 0V on the +terminal.
E

Yep, It's working without any issues ^^.

Thanks to this site, I can correct mistakes and learn many new details on the question I ask.

 

hi,
Please post your work.
E

 

hi,
Please post your work.
E

Yeah sure here, Uhm... do you think that I did it completely correct? here: