ASU Spring 2017 Session B Week 7 Update

This week my head really feels like it is going to implode. I caught another cold and have felt miserable. EEE 202 has had so much information coming at us the last few weeks and the darn lecture videos are so short. I definitely think EEE 202 would be much more enjoyable at a slower pace with time to digest the material over a full semester. So much good stuff and 7.5 weeks just doesn’t do it justice. I really like it, but I need time to think and ponder and assimilate new information and there just hasn’t been a free moment to do much of that.

This week in Circuits I no lab to mess with, but it’s been all about Laplace Transforms. Specifically:

  • Laplace Transform
  • Inverse Laplace Transform
  • Solving Differential Equations with Laplace Transform
  • Circuit Analysis in the Laplace Domain
  • Transfer Functions in the Laplace Domain

The unit step and impulse function showed up as well. I don’t remember seeing those much in MAT 275, but I can see how they can be useful. I have a list of topics I want to review over the summer before Fall starts up. Definitely need to keep practicing so as not to forget before I have four EEE classes in the fall!

So remember that MAT 275 Differential Equation class! Pay attention and learn that Laplace transform stuff in there. It comes back big time for the last week of EEE 202. It’s quite elegant how the different mathematics all come into play in Circuits I.

This week in PHY 241 the class had its last test prior to the final. I did better than I thought I was going to do and pulled a 91/100 somehow. I had a couple of very lucky guesses. The test covered Relativity and Modern Physics from chapters 36-39. In addition to the test, Chapter 40 on Quantum Mechanics in One Dimension was covered and we’ll see a few questions from there on the cumulative final. Feels like there is a whole lot more that could be said on that topic, and just barely scratched the surface there. Feels weird to have all my Mastering Physics homework questions complete, but glad I’ll be applying all that physics knowledge to EEE problems moving forward.

All that remains now for me is to wrap up the finals. Saturday I’ll have my PHY 241 final and Tuesday May 2nd I plan to take EEE 202. PHY 241 is worth 30% and EEE 202’s is worth 40%!. EEE 202 seems extremely high to me, but it is what it is. Hopefully I can make it through them all in one piece. EEE 202 has me a bit nervous, but at least both will be open book and open notes. Not much time to look stuff up, but with only 7.5 weeks, just no way to memorize all the formulas and circuit analysis techniques.

ASU Spring 2017 Session B Week 6 Update

I missed my 10am posting today. To say I’ve been busy this week is an understatement. Ended tonight on a high note and did well on the weekly quiz in EEE 202. This week, EEE 202 has been focused on:

  • Variable Frequency-Response Analysis: Network Functions
  • Frequency Response Using Bode Plot
  • Series Resonant Circuits
  • Parallel Resonant Circuits
  • Filter Networks

I really struggled with the Bode Plots for some reason. Didn’t catch the part about using the magnitude initially and still not 100% comfortable with them. I’m missing something on how they can be drawn quickly by hand to determine what’s happening with a transfer function. I just haven’t had the time I would have liked to really focus on them. I’ll see my cousin the mechanical engineer next week and hope to pick his brain a bit on them and see what he knows…

This week our final lab project was due and it took me a bit longer than usual to piece everything together. Once I got the RC circuit part down, the RL part was pretty straight forward. Had to use a couple of new parts of LTspice, MATLAB and the Digilent Waveforms software. Hopefully I did it all correctly.

I just hope I can pull all these pieces together for the final that is coming up on May 2nd! So much information so quickly.

In PHY 241 this week we went over two chapters

  • Chapter 37 – The Foundation of Modern Physics
  • Chapter 38 – Quantization

In addition, I also knocked out the homework that is due on Monday for Chapter 39 – Wave Functions and Uncertainty. Interesting topics, but again, just wish there was more time to better understand it all and absorb it. More time, more time, more time! I feel like all I have been doing lately is waking up, sitting at my desk and working away and still need more time. So much interesting stuff I wish I could give more attention to!

Next Tuesday, the class has the last test covering the past four chapters, then one more chapter and the final on April 28th-29th. (No it’s not a two day final, probably a 2 hour exam taken either day.) Definitely glad I’m down to 9 more homework problems in Mastering Physics. Its a neat system, but will be glad when I’ve run the physics gauntlet and can turn my attention to EE full time once CHM 114 – Chemistry for Engineers is done over the summer.

ASU Spring 2017 Session B Week 5 Update

It’s been a busy and tough week school wise, but I’m ahead enough that I’m hoping to enjoy the Easter holiday with family and not have to worry about school.

In PHY 241 this week I took the second test on Tuesday. I did well and scored a 101/100. The professor had it 108/100, but I keyed in the wrong value in the calculator and didn’t catch it. Had it down on paper correct. I hate it when that happens, but I’ll gladly take that score and hope to not make that kind of careless mistake again.

With Waves and Optics done, the class turns its attention to relativity and modern physics. Chapter 36 cover’s Einstein’s Principle of Relativity. All new info for me. I remember the famous E=mc² formula, but don’t remember ever really having to work with it. Hopefully over the next few days I’ll better understand it and the other topics discussed like time dilation, the Lorentz transformations and relativistic momentum, velocity and energy. It’s all very interesting stuff.

So far though, PHY 241 has been a much more straight forward set of lectures and homework than the other two classes here at ASU.

EEE 202 was really interesting this week. More crazy math, but once I figured out how to switch my calculator over to polar and work with it, the math was really pretty straight forward. This week the class had us looking at AC Steady State Analysis so thinks like sinusoids and phasors, phasors and complex numbers, impedance and admittance and frequency domain analysis.

The lectures for the class are still far too short but between the recitation sessions and the worked homework solutions I’ve been studying, slowly making my way through the material. Just wish I had more time to really practice and study. I’m having the worst time remembering the different formulas and need to put together another Anki deck. I should have done that sooner, but no use lingering on what I should have done.

This week’s Lab 5 was really neat. It look me a little bit to sort out, but we were studying first order RC and RL circuits. The lab asked us to put simulate them in LTspice, then use MATLAB to plot the response and then finally we built them, setup a custom wave form and then use the oscilloscope to view the waveform.

The waveform was a pretty standard pulse that was on for 100 microsecond then off for a total period of 200 microseconds. It had a 1 microsecond rise and fall though. It took a little bit of tinkering in MATLAB and I learned about the Heaviside capabilities MATLAB has to solve the problem. Once I had the equation for the current, it was pretty straightforward then to find the voltage through the resistor and the inductor or capacitor. It was a nice feeling to see the MATLAB plot match what I had in LTspice when it all came together.

At first I neglected to enter the rise and fall into the waveform and had some really odd oscilloscope readings. It took a little bit to figure out the custom wave form options in the Digilent software, but if anyone is interested, here is an Excel workbook, Graves Lab 5 Waveform, that could be saved as a CSV and then imported into the Digilent Waveform software to save some time. This cleared up the issue and the oscilloscope waveform match the simulation and MATLAB.

Here’s a shot of one of the pretty MATLAB plot:

lab5-RL

Good stuff!

ASU Spring 2017 Session B Week 4 Update

I think I’ve just about kicked that cold from last week to the curb. EEE 202 Circuits I has been really interesting and pretty challenging this week. This week the lectures focused on first and second order transient circuits. First order circuits looked at resistor and capacitor or resistor and inductor circuits where the second order circuits were various combinations of RLC (resistor, inductor and capacitor circuits). Differential equations play a very important part in solving these equations in addition to the unit step function.

I am not 100% comfortable with the second order circuits yet. I still think a big part of circuit analysis is practicing and working through as many problems as you can find. The more you do the better you get. I wish I had more time for this EEE 202 class. This is one course I think ASU should have at a full semester, but that is just not in the cards for me. Good news is though that I’ve really enjoyed what I’ve been study, just wish I had more time to study. Seems like I wake up, crack open the books and work most of the day until it is time to go bed and then do it all over again the next day.

This week’s lab had me working through Thévenin, Superposition and Delta-Wye transformation. I’d had a little bit of trouble with the Delta-Wye circuits but after working through the lab, they weren’t so bad. Again the lab centered around using LTspice for the simulating the circuits and then building the circuits on a breadboard and taking measurements with the multimeter and or the Digilent Analog Discovery.

In PHY 241, two chapters were covered – Chapter 21 on Superposition and Chapter 22 on Wave Optics. Some of the theory that was studied way back in FSE 100 on musical instruments was looked at in greater detail which was neat to see again. Standard issue Mastering Physics homework problems that weren’t too bad.

Also, Test 2 is coming up next week on Tuesday so I got started on reviewing the four wave chapters and practice test that the professor posted. Glad this last physics class is almost done!

I think I’ve just about kicked that cold from last week to the curb. EEE 202 Circuits I has been really interesting and pretty challenging this week. This week the lectures focused on first and second order transient circuits. First order circuits looked at resistor and capacitor or resistor and inductor circuits where the second order circuits were various combinations of RLC (resistor, inductor and capacitor circuits). Differential equations play a very important part in solving these equations in addition to the unit step function.