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Inverting and Noninverting OpAmp Voltage Amplifier Circuits
41 questions By Tony R. Kuphaldt
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Question 22 of 41
Determine both the input and output voltage in this circuit:
Reveal answerVin = -10 V Vout = 24 V
Follow-up question: how do we know that the input voltage in this circuit is negative and the output voltage is positive?
Notes:Ask your students how they solved this problem, sharing techniques and strategies to help other students know where to begin and where to proceed from there.
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Question 23 of 41
The equation for voltage gain (AV) in a typical inverting, single-ended opamp circuit is as follows:
AV = R1 R2Where,
R1 is the feedback resistor (connecting the output to the inverting input)
R2 is the other resistor (connecting the inverting input to voltage signal input terminal)
Suppose we wished to change the voltage gain in the following circuit from 3.5 to 4.9, but only had the freedom to alter the resistance of R2:
Algebraically manipulate the gain equation to solve for R2, then determine the necessary value of R2 in this circuit to give it a voltage gain of 4.9.
Reveal answerR2 = R1 AVFor the circuit shown, R2 would have to be set equal to 1.571 kΩ.
Notes:Nothing more than a little algebra to obtain the answers for this question!
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Question 24 of 41
Calculate the necessary resistor value (R1) in this circuit to give it a voltage gain of 15:
Reveal answerR1 = 1.467 kΩ
Notes:Ask your students how they solved this problem, especially since it is fairly safe to say that they didn’t find the equation directly solving for R1 in any book. Algebraic manipulation is necessary to take the standard voltage gain equation and put it into a form suitable for use answering this question.
