Calculate Output Voltage of Op-Amp Circuit

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SUMMARY

The forum discussion focuses on calculating the output voltage of an op-amp circuit, specifically addressing the confusion surrounding inverting and non-inverting configurations. The user initially misapplies superposition and struggles with the circuit's configuration, leading to incorrect voltage outputs. Key insights include the importance of using Kirchhoff's Current Law (KCL) to derive the output voltage and recognizing the limitations of op-amps in practical applications, particularly regarding output voltage limits based on power supply rails. The final correct output voltage, after addressing configuration errors, is determined to be -16.5V.

PREREQUISITES
  • Understanding of operational amplifier (op-amp) configurations
  • Familiarity with Kirchhoff's Current Law (KCL)
  • Knowledge of feedback mechanisms in op-amp circuits
  • Basic circuit analysis techniques, including nodal analysis
NEXT STEPS
  • Study the ideal op-amp assumptions and their implications in circuit design
  • Learn about the Summing Amplifier configuration and its applications
  • Explore practical limitations of op-amps, including output voltage constraints
  • Review examples of complex op-amp circuits and their analysis techniques
USEFUL FOR

Electronics students, circuit designers, and engineers seeking to deepen their understanding of op-amp behavior and circuit analysis techniques.

  • #31
berkeman said:
Get the same answer with two different approaches, and you can feel good about your answer, right? And I'll bet you're starting to like the KCL better about now, right?

I felt pretty good about it until my professor said it was wrong...then checked his notes...then told me it was right (this kind of thing happened twice in lab!) it's the same professor who gave an unsolvable op-amp design test problem...I get the feeling I might have to come to this forum for lots of help this semester lol. I hope I'm not wearing out my welcome.

But yeah, I like KCL because it's difficult to screw it up
 

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