ELEC 226, Spring 2003
Prof. Rich Kozick

## Laboratory 6 Design of a Waveform Generator

Objective: In this lab, you will use your knowledge of circuits to design a system that will generate square, triangle, and sine waves with variable amplitude and variable frequency.

Design Specifications:

• Your circuit should produce three simultaneous output signals: the square, triangle, and sine waves.
• The amplitude and frequency should be variable using potentiometers.
• Design your system to operate at 1,000 Hz, and strive to make it work over as wide a frequency range as possible. Explain how you would modify your design to make it work over a larger frequency range, both lower and higher.
• The parts that you may use are op amps, resistors, capacitors, inductors, and potentiometers (variable resistors). I will try to have quad-741 ICs with four op amps.
• Students will work in groups of two.
There are many ways to design this system, so be creative and have fun!

Testing and Documentation:

• Determine the operating range of your design, in terms of the wave amplitudes and frequencies.
• Include a complete circuit diagram of your design, showing all circuit components and their values.
• Provide a brief explanation of the reasoning that you used to design your system and choose component values.
• Explain how your design can be modified to allow operation over a wider frequency range.
• Use your lab notebooks to record your work, and I will ask you to provide a lab report that documents the items listed above. One lab report will be prepared by each pair of students, and it will be due at the last lecture on Monday, April 28.
** DUE DATE CHANGED TO APRIL 29 BY 3:30 PM **

Schedule: Students will attend lab every week for the next four weeks, according to the following schedule. Refer to the lab roster to see whether you are in Section A or Section B.

• April 3: Section B from 8:00 AM - 9:10 AM, Section A from 9:10 AM - 10:20 AM.
Develop a first draft of your system and circuit diagrams.
• April 10: Section A from 8:00 AM - 9:30 AM, Section B from 9:30 AM - 11:00 AM.
Test and refine your design, build and test subsystems.
• April 17: Section B from 8:00 AM - 9:30 AM, Section A from 9:30 AM - 11:00 AM.
Continue to build and test your system, and integrate subsystems.
• April 24: Section A from 8:00 AM - 9:30 AM, Section B from 9:30 AM - 11:00 AM.
Demonstrate working system and evaluate operating range.