EGR 224/RC Lab

The following page provides some supplemental information for the RC Circuits and Filtering lab for EGR 224L. It has been updated for Spring, 2019.

Clarifications

• If any of your figures looks wrong, it probably is! Be sure to have a TA check your figures so that you leave the lab with a valid data set.
• Use MATLAB on the PC to do the data acquisition
• For newer versions of MATLAB (2015 and after), the proper way to get out of a "keyboard" environment is to type the word "dbcont" and hit enter; the word "return" no longer works for that
• For Maple, when you put in the sinusoid at 60 rad/s, Maple may try to be "helpful" and use double angle formula to come up with a result that is a complete mess; try a frequency of 60.01 rad/s instead. It's just about the same speed and Maple won't be...helpful...
• The experimental phase values should track well at low frequencies but may fluctuate a bit at higher frequencies due to inaccuracies in determining peaks.

Element Values

• Resistances:
  • 1, 9, 17: 2.2 k\(\Omega\)
  • 2, 3, 10, 11, 18, 19: 4.7 k\(\Omega\)
  • 4, 5, 12, 13, 20, 21: 10 k\(\Omega\)
  • 6, 14, 16, 22: 15 k\(\Omega\)
  • 7, 8, 15, 23, 24: 22 k\(\Omega\)
• Capacitances
  • 7, 15, 23: 2.2 \(\mu\)F
  • 4, 6, 8, 12, 14, 16, 20, 22, 24: 4.7 \(\mu\)F
  • 2, 5, 10, 13, 18, 21: 10 \(\mu\)F
  • 1, 3, 9, 11, 17, 19: 22 \(\mu\)F

Links

• The MATLAB:Transfer Functions page should be very helpful here.
• The files for this assignment can be downloaded from http://classes.pratt.duke.edu/FILES/EGR224/DAQS/RCfilter
• See Transferring_Files for information on how to get the files to your CIFS space.

Wiring Images

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  Closeup of the breadboard

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  Closeup of the CB-68LP

Click on the pictures above to make them larger.

Voltage Images

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  Clean graphs indicating good wiring

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  Fuzzy graphs indicating wiring problems