OP amp circuit problem

  • Engineering
  • Thread starter farahtc
  • Start date
  • #1
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Homework Statement


The op amp circuit shown bellow is intended to provide any gain between -10 (for k=0) and +10 (for k=1) by adjusting the potentiometer. Let R1 and R2 have the scaled values, show that..

V2/V1= {r1/(r1+10k)} [-11/{1+(10kr1/r1+10k)}] + [r2/r2+10(1-k)] [1+ {11/1+10kr1/r1+10k}]


Homework Equations





The Attempt at a Solution



i have no idea how to write nodal equations for a potentiometer. If any one tell me how to do that, i can figure out the rest by myself. thanks
 

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Answers and Replies

  • #2
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Think of the potentiometer as 2 resistors in series with values 10k and 10(1-k). That's all.
 

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