ELEC 101, Spring 2005
Prof. Rich Kozick

Homework 5

Date Assigned: Monday, February 14, 2005
Date Due: Thursday, February 17 (pre-lab activities in item 2) and Friday, February 18, 2005 (items 3-6)

  1. Reading: Please continue to study Chapter 2 in the Bobrow text: Section 2.4 (op amps), Section 2.5 (Thevenin equivalent circuit), and Section 2.6 (superposition).

  2. Before lab on Thursday, February 17, please read the Lab 5 handout and do the pre-lab activities in your lab notebook.

  3. Please solve problem 2.35 in the Bobrow text. Show the steps that you use in your analysis.

  4. Design an op amp circuit such that the output voltage is one-fourth the input voltage, i.e.,
    vo = 0.25 vi. (Hint: You may need more than one op amp.)

  5. Specify an op amp circuit whose output voltage is the average of three input voltage sources:
    vout = (va + vb + vc)/3. Specify values for all resistors in your circuit diagram.

  6. Consider the electronic ohmmeter shown below. To use the ohmmeter, an unknown resistance R is connected as shown, and then the value of R is obtained by measuring the voltage vo and then computing R = -1000 vo.


Thank you.