ELEC 225 Laboratories, Fall 2012
We will have seven lab sessions this semester in Dana 305.
The dates for the first few labs are listed below, and
the rest of the dates will be posted as we go through the course.
For all lab sessions, please attend on your assigned day.
Also, please bring your textbook, class notes, and breadboard
(once they are given to you) to all lab sessions.
Aug. 23 & 28: Meet at 1:30 PM in Dana 305 for a brief pre-course survey
(no breadboards needed).
Aug. 30 & Sep. 4: No labs.
Sep. 6 & 11:
Lab 1 (Introduction to PSpice)
Tips for PSpice:
- VDC is a DC source.
- When you start a new circuit, close your previous projects
and open a new project for the new circuit.
Sometimes you may need to exit PSpice in order to clear net alias labels from previous
projects.
- MEG=106 and M=10-3 (milli)
- Do not leave a space between element value and units;
for example, "10MEG" is correct but "10 MEG" will cause an error.
- For op amp circuits, be careful with + and - inputs, and use
"mirror vertically" to flip the op amp terminals.
Sep. 13 & 18:
Lab 2 (Dependent Sources and Transistors)
Sep. 20 & 25: No labs.
Sep. 27 & Oct. 2:
Lab 3
(D/A Conversion, Superposition, and Thevenin Models)
Data for part (i) from 2011:
Excel file and
PDF file
Data for part (i) from 2012:
Excel file
Lab report notes (the entire report can be hand-written, and each
student is asked to prepare an independent report, due at your Lab 4 session
in class on Wednesday, Oct. 17, or any time before that):
- Present your analysis for parts (a)-(e) and answer the questions.
- For part (f), draw your 4-bit DAC circuit, and do your best to explain
the operation of the circuit.
If you are clever, you can use your analysis of the 2-bit DAC to explain
how most the 4-bit DAC operates (look for the recursive structure).
Use superposition and source transformations.
- For part (g), state how the maximum voltage of the waveform that
you observed on the oscilloscope is related to your analysis in part (f).
- For part (i), you can use the measured data set from 2012 provided above (or your own data, if you have it).
Explain the procedure for using this data to obtain the Thevenin
equivalent circuit for the output pins on the counter chip.
Use the Thevenin model to answer the questions.
Oct. 4 & 9: No labs (with Fall Break on Oct. 8-9).
Oct. 11 & 16: Lab 4
Oct. 11, 16, & 18: No labs (with IEEE trip to Volvo plant on Oct. 18)
Oct. 18 & 23: No labs ?? (with IEEE trip to Volvo plant on Oct. 18 &
IEEE technical talk on Oct. 23).
Oct. 23 & 25:
Lab 4: Op Amp Circuits
(Word file and
pdf file)
Lab 4 reports are due
at your Lab 5 session on Oct. 30 or Nov. 1
in class on Monday, Nov. 5.
The Lab 4 reports may be handwritten (or a combination of typed and handwritten).
Please refer to the lab report rubric document
for guidance on how the lab reports will be evaluated.
Click here for a Word file containing the plot
produced by the Matlab code in Lab 4.
Oct. 30 & Nov. 1: Lab 5
(Amplifier Design Using Operational Amplifiers)
Nov. 6 & 8: No labs
Nov. 13 & 15:
Lab 6
(Low-Pass and High-Pass Filter Circuits)
Nov. 20 & 22: No labs (with Thanksgiving Break on Nov. 21-23).
Nov. 27 & 29: Lab 7
(Band-Pass Filters, Frequency Response, and Matlab)
and Matlab script lab7.m
Dec. 4: No lab
Links to Matlab tutorials
PSpice references:
PSpice tips:
- VDC is a DC source.
- When you start a new circuit, close your previous projects
and open a new project for the new circuit.
Sometimes you may need to exit PSpice in order to clear net alias labels from previous
projects.
- MEG=106 and M=10-3 (milli)
- Do not leave a space between element value and units;
for example, "10MEG" is correct but "10 MEG" will cause an error.
- For op amp circuits, be careful with + and - inputs, and use
"mirror vertically" to flip the op amp terminals.
Resistor Color Code Guide
Data sheets for ICs: