ELEC 226, Spring 2003
Prof. Rich Kozick
Date Assigned: Wednesday, March 19, 2003
and revised after class
**** REVISED ****
Date Due: Monday, March 31, 2003
Continue to study Chapter 7, all sections.
For March 26, begin reading Chapter 8,
Sections 8.1 and 8.2.
- Exam 2 is scheduled for Monday, March 31 on
the course syllabus.
However, we discussed moving the
date for Exam 2 to Monday, April 7.
Please let me know by Friday, March 21, if you have any objections
to this change in the date of Exam 2.
The topics for Exam 2 will include Chapters 7 and 8.
** Exam 2 is on Monday, April 7. **
- Please solve the following problems
in Chapter 7 for Monday, March 31.
I suggest that you try to solve as many of these as you can
by March 26, so that you can ask questions.
7.34 (click here for solution to 7.33)
7.46 (change the 52 V source to 32 V)
7.52 (change the 1 kohm resistor to 6.8 kohm and the
0.025 microF capacitor to 0.2 microF)
** Problem 7.74 will be due on
Wednesday, April 2. **
There may be some problems from Chapter 8 on
Homework 10 that will be due on
- Please answer the following question for Monday, March 31.
Figure 1 contains a slightly more general
version of the clock circuit from
Lab 4, where Ra
and Rb may not be equal.
Assume that the op amp is powered so that -10 V <=
vout(t) <= +10 V, and
let T denote the period of the waveform produced
by the oscillator circuit.
Click here for Figure 1
- Find the formulas for the capacitor voltage, vc(t),
during the time intervals 0 <= t <= T/2 and
T/2 <= t <= T.
Assume that the circuit is in "steady-state" at time t=0, i.e.,
the circuit has been oscillating for a long time before t=0.
Your formulas will be a function of all of the resistor and capacitor
values in the circuit
(R, C, Ra, Rb).
- Use your results for vc(t)
to find a formula for the period, T,
as a function of the resistor and capacitor
values in the circuit.
- Sketch vout(t) and
vc(t) versus time, and indicate the effects
of the circuit parameters on the amplitudes and period in your plot.
- How should Ra and Rb
be chosen so that vc(t)
is close to a triangle wave?
Please explain based on your formulas for vc(t).
- Lab notebooks will be collected on Thursday, April 10,
and I will look at Labs 3, 4, and 5.