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Summer and Subtractor OpAmp Circuits
25 questions By Tony R. Kuphaldt
Page 9
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Question 25 of 25
Calculate the voltage gain of the following opamp circuit with the potentiometer turned fully up, precisely mid-position, and fully down:
- AV (pot fully up) =
- AV (pot mid-position) =
- AV (pot fully down) =
Reveal answer- AV (pot fully up) = 1
- AV (pot mid-position) = 0
- AV (pot fully down) = -1
Follow-up question: can you think of any interesting applications for a circuit such as this?
Challenge question: modify the circuit so that the range of voltage gain adjustment is -6 to 6 instead of -1 to 1.
Notes:Ask your students how they approached this problem. How, exactly, did they choose to set it up so the solution became most apparent?
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