THE GEORGE
WASHINGTON UNIVERSITY
DEPARTMENT OF
ELECTRICAL AND COMPUTER ENGINEERING
ECE 20 - SPRING
2000 - FINAL DESIGN PROJECT (20 points)
Description:
The infamous CFZ Electronics Inc. (www.cfz.com)
is expanding its product offerings. Based on the success of the recent
"laptop" project, the management is now bidding for a new contract
to build audio amplifiers. The project is viewed as an extension of the
earlier project and will employ most of the developed designs. As an engineer
in this corporation, your second project is to design and test the
amplifier circuit whose specifications are as follows:
Specifications:
-
The power supply is
120 Vrms at 60 Hz.
-
CD stereo input (two
channels: Left and Right) at 250 mV peak output. A source of 250 mV peak
sinusoid from the function generator can be used for development and testing
purposes.
-
Stereo output. The standard
load is an 8 Ohm speaker with a power rating of 0.2 Watts.
Suggestion:REALISTIC
Speaker Cat. No. 40-1277A. Approx. Cost :$ 8 Available at Radio Shack.
-
Volume control per channel:
-
Digital: 3-bit dip switch
control.
-
Minimum gain (000):
-3 dB
-
Maximum gain (111):
20 dB
-
Frequency range: of
300 Hz - 10 kHz (without distortion).
-
Maximum variation in
gain over the frequency range: +/- 1 dB
-
Four level LED display
per channel at 2V, 1V, 0.5V and 0.25V output levels
Suggestion: GaAsP
LEDs of three colors. MV5753. Approx. Cost : $ 1 for 10 pieces
Due Date:
First week of May;
meeting time to be arranged.
Requirements:
You are required to have a:
-
Professional
project report and hand it in prior to your presentation.
-
10 minute presentation
with 5 minute question and answer period. All presentations must be done
with Power Point. An example of Power Point presentation can be downloaded
here.
-
Complete working circuit demonstration and
explanation of features.
-
Additional bonus prizes are available for
those designs who not only meet the specs. but also impress the
management team. All engineers who are interested in additional bonuses
must highlight and document the innovative features of their circuits.
These features include but are not limited to the following:
-
audio fidelity.
-
power efficiency.
-
footprint of the test circuit and the number
of components used.
-
Note to ECE 197 students: The final
project is an extra 10 points (10% of your grade) if it is demonstrated
in P-Spice and 20 points (20% of your grade) if it is demonstrated
with a working circuit.
The boss is under heavy pressure from the
board to complete the project on time. Therefore, a project which does
not meet the specifications or is late will result in the termination
of your employment at our corporation.
Thank you for your cooperation,
CFZ Electronics Management
Prepared by: C. E. Korman, (202)
994 4952, korman@seas.gwu.edu, April 2000.
Suggestion for Speaker and LED are
given by Kaushik