ELEC 101, Spring 2005
Prof. Rich Kozick
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)
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).
- Before lab on Thursday, February 17,
please read the
Lab 5 handout and do the pre-lab activities in your lab notebook.
- Please solve problem 2.35 in the Bobrow text.
Show the steps that you use in your analysis.
- 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.)
- 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.
- Consider the electronic ohmmeter
To use the ohmmeter,
an unknown resistance R is connected as shown, and then
the value of R is obtained by measuring the voltage
and then computing
R = -1000 vo.
[CIRCUIT DIAGRAM IS NOT AVAILABLE IN HTML DOCUMENT.]
- Since vo
is always within
the range -10 volts to +10 volts,
what is the maximum value of R that can be measured with
- How can the circuit be modified in order to measure
resistance values up to 100 k ohms?
Explain the reasoning behind your modification, and explain
how the value of R is computed from
in your circuit.