Author Topic: operational amplifier simulation  (Read 20043 times)

alfalion

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operational amplifier simulation
« on: February 24, 2011, 01:03:00 am »
Hi there. I'm new to this forum. I like electronics very much and i was wondering if a simulation of operational amplifiers can be made. Something like changing the input voltage or some resistor and see what you get at the output using EJS.
Some of the most important opamp categories can be found here
So is it possible?
Thank you.

Fu-Kwun Hwang

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Re: operational amplifier simulation
« Reply #1 on: February 25, 2011, 12:31:28 am »
I hope the following simulation is what you need!
You can use sliders to change R1,R2, Vin.
Click invert to find the circuit type similar to your case!

Full screen applet or Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
  • Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!

alfalion

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Re: operational amplifier simulation
« Reply #2 on: February 25, 2011, 06:00:24 pm »
Yes, this is what i was wondering about. Thanx.

Tminus

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Re: operational amplifier simulation
« Reply #3 on: June 08, 2011, 05:52:02 pm »
Hello Mr. Fu-Kwun Hwang, can you explain or comment the variables (what they do) used for this simulation? I want to better understand this simulation. Thankyou very much.

Fu-Kwun Hwang

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Re: operational amplifier simulation
« Reply #4 on: June 08, 2011, 06:52:58 pm »
The key point is: the same current flow through both resistors $R_1,R_2$.

For non-invert case:
 $V_{out}=I,(R_1+R_2), qquad V_{in}=I, R_1$
so $V_{out}=frac{R_1+R_2}{R_1} V_{in}=(1+frac{R_2}{R_1}) V_{in}$


For invert case:

 $V_{out}= -I, R_2, qquad V_{in}=I, R_1$
so $V_{out}=-frac{R_2}{R_1}, V_{in}$

srisak31

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Re: operational amplifier simulation
« Reply #5 on: October 14, 2015, 04:18:15 pm »
 :D

chamDz

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Re: operational amplifier simulation
« Reply #6 on: October 26, 2015, 06:00:24 pm »
i have some concerns regarding this  :-[