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NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/ > Information about this web site > Request for physics Simulations > operational amplifier simulation
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Author Topic: operational amplifier simulation  (Read 17624 times)
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alfalion
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on: February 24, 2011, 12:03:00 am » posted from:Baia Mare,Maramures,Romania
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.
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Fu-Kwun Hwang
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Reply #1 on: February 24, 2011, 11:31:28 pm » posted from:Taipei,T\'ai-pei,Taiwan
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!

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* ejs_operationalAmplifier.jpg (18.1 KB, 673x392 - viewed 585 times.)
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alfalion
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Reply #2 on: February 25, 2011, 05:00:24 pm » posted from:Baia Mare,Maramures,Romania
Yes, this is what i was wondering about. Thanx.
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Tminus
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Reply #3 on: June 08, 2011, 04:52:02 pm » posted from:Satu Mare,Satu Mare,Romania
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.
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Fu-Kwun Hwang
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Reply #4 on: June 08, 2011, 05:52:58 pm » posted from:Taipei,T'ai-pei,Taiwan
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}
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srisak31
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Reply #5 on: October 14, 2015, 03:18:15 pm » posted from:BANG BUA THONG,NONTHABURI,THAILAND
 Cheesy
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chamDz
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Reply #6 on: October 26, 2015, 05:00:24 pm » posted from:,,Sri Lanka
i have some concerns regarding this  Embarrassed
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Discovery consists of seeing what everybody has seen and thinking what nobody has thought. ..."Albert von Szent-Gyorgyi(1893-1986, 1937 Nobel Prize for Medicine, Lived to 93)"
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