Get Help Solving a Circuit Problem: Tutor-Free Solution

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SUMMARY

The discussion focuses on solving a circuit problem involving two voltage sources and an operational amplifier (op-amp) with a gain of 300,000. The recommended approach is to utilize the Superposition theorem to analyze the circuit effectively. Participants are advised to redraw the circuit with input and output impedances outside the op-amp and apply Kirchhoff's Voltage Law (KVL) or the principle of current conservation to derive the necessary equations. This method ensures accurate results consistent with the theory of ideal op-amp applications.

PREREQUISITES
  • Understanding of Superposition theorem in circuit analysis
  • Familiarity with operational amplifier characteristics and configurations
  • Knowledge of Kirchhoff's Voltage Law (KVL)
  • Ability to analyze circuits with multiple voltage sources
NEXT STEPS
  • Study the application of the Superposition theorem in circuit analysis
  • Learn about ideal op-amp behavior and its implications in circuit design
  • Explore techniques for calculating node voltages in complex circuits
  • Review examples of circuits with multiple voltage sources and their solutions
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Students preparing for electrical engineering exams, circuit designers, and anyone seeking to enhance their understanding of operational amplifier circuits and analysis techniques.

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Homework Statement


http://i62.tinypic.com/2n00efo.jpg

Homework Equations

The Attempt at a Solution


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I drew the circuit here:
http://i57.tinypic.com/10rmp20.jpg
I'm not sure where to start with this problem.
Edit: Sorry for using this site for help so much, I just have midterms coming up soon and need to get practise problems solved and I don't have money for a tutor.
 
Last edited:
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My recommendation: Start with your handwritten drawing and apply the existing basic rules for analyzing a network that contains two voltage sources: Superposition.
This procedure will lead you to the correct result.
Finally, you can check your result by setting (a) the open-loop gain to infinite, (b) the input resistance to infinite and (c) the output resistance to zero.
Then, you must arriove at a simple expression that is known from the theory of IDEAL opamp applications.
 
Hint:
Redraw the circuit with input and output impedances OUTSIDE the op amp. Give the op amp itself a gain of 300,000.
If you do this right you will wind up with three nodes: vn, vo and vg plus of course the input voltage. vo is the op amp output voltage which will differ from vg since there will be a drop across the 5K output impedance.
Use standard KVL or sum of currents = 0.
 

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