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Homework Help: Cicrcuit design using opamp

  1. May 1, 2010 #1
    helllo i am having a problem designing this circuit i should use opamps resistors and switched
    i have a fixed 5v dc input i should get an outpout of -1 -2 -4 -8 -16 the user should choose wich one he should use can i get some help plz?
     
  2. jcsd
  3. May 1, 2010 #2
    Look up the inverting amplifier configuation. Then figure out which resistor values will give you each desired output. Then figure out how to use switches to generate the different resistor combinations.
     
  4. May 1, 2010 #3
    hii and thank you i simulated this circuit on multisim the first one on the left gives vout across the resistor 1v and the other circuit multiplies it by 2
    by the problem i am having is connecting them together
     

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