Need help understanding the proof of Thevenin's theorem

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SUMMARY

The forum discussion centers on understanding the proof of Thevenin's theorem, specifically referencing the method outlined in the Sadiku textbook. The user seeks clarification on the validity of placing an independent current source in the circuit where the load was previously connected to derive the equation V = Vth + I*Rth. The discussion highlights the connection to the substitution theorem as a formal proof method for Thevenin's theorem.

PREREQUISITES
  • Understanding of Thevenin's theorem
  • Familiarity with circuit analysis techniques
  • Knowledge of independent current sources
  • Basic concepts of the substitution theorem
NEXT STEPS
  • Study the derivation of Thevenin's theorem in the Sadiku textbook
  • Learn about the substitution theorem in circuit analysis
  • Explore practical applications of Thevenin's theorem in electrical engineering
  • Review examples of circuit simplification using Thevenin's equivalent
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Electrical engineering students, circuit designers, and anyone seeking to deepen their understanding of Thevenin's theorem and its applications in circuit analysis.

Pedro Cardoso
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Hello.
Uh, I'm trying to undestand how to prove Thevenin's theorem. The Sadiku book puts an independent current source where the load used to be in order to reach the equation: V = Vth + I*Rth. I do understand how he reaches that conclusion after putting the source, what I don't understand is why he can put that current source where the load was. Could someone explain to me that? I'm not sure if that is a formal proof, but it is a correct way of proving it, then I wish to learn it.
 
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Nevermind, you prove it by using the substitution theorem...
 
Most likely this can only be answered by an "old timer". I am making measurements on an uA709 op amp (metal can). I would like to calculate the frequency rolloff curves (I can measure them). I assume the compensation is via the miller effect. To do the calculations I would need to know the gain of the transistors and the effective resistance seen at the compensation terminals, not including the values I put there. Anyone know those values?

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