Nicole’s posterous

Final Post

Mr. Peterson provided these questions on my physics independent research project, which I answered based on my experience with electronics over the past weeks. 1. I try to structure the projects such that you have to do some lab work and also learn some new physics. Obviously some projects are more lab work while others are more new physics. Comment for at least two sentences on the amount of lab work you did and the amount of new physics you learned during your project.
I worked hard on my physics project every day that I was in class, either taking notes, wiring circuits, or answering questions about them. I think that this amount of work adds up over six weeks and is appropriate for my project. I also learned A LOT by working with electronics over this period of time. I learned more about circuits, resistors, capacitors, switches, segment readouts and all sorts of electronic equipment, as well as discovering more about the importance of patience and flexibility.
  2. I try to structure the project so that there is a final product that you are always heading towards and that to get there you have to do some lab work and learn some new physics. I like these goals to be as specific as possible. What were the specific goals of your project as you saw them (this means do not look them up, just write down what you thought the goals were)? How could I change the goals you were given to make the project better?
My project is I think one of the few that doesn't have a specific, significant final product. I did make some optional projects, but one of these did not work and I gave up on it. The goal of this project was, more broadly, at least for me, to learn more about electronics. I definitely accomplished this! As for criticism, I think that a larger final product would be nice for this project, but I understand why that would be difficult to plan and maybe even get working properly, so it could cause a lot of frustration and would be a big challenge, especially since it would be difficult to work on out of school.
  3. I try to have a component of each project that is evaluated outside of the classroom or get you out of the classroom. If this component existed what is it and how did you like it? If it did not exist, do you have any ideas about how to add this type of component to future projects? Provide at least two.
My project did not involve this sort of outside experience, but I think that it would be interesting to include in the future. This component could include visiting a workplace that deals with electronics, such as JCI, or evaluating the importance of electronics on our society by visiting various related areas in the Holland area.
  4. What grade do you deserve for your project? Justify your answer with the specific pieces of evidence I should consider.
I think that I deserve a high grade for this project. I came to class ready to work on my project and diligently completed as many tasks as I could in the time I had at school. It was difficult for me to work outside of class, but I still learned a ton about electronics. I feel like this project definitely was worthwhile for me, though it didn't lead me to pursue this area in the future. I got most of the circuits to work properly and gave all of the ones that didn't end up working out a great try. I also answered all of the required questions as completely as I could and took detailed notes on the appendix and chapters. In my opinion, all of this hard work should warrant an A on my physics independent research project.

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UNstuck!

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After Mr. Peterson looked at my project again and I switched my random resistors under the printed variable resistance out with actual variable resistors, my electronic organ finally worked. I took a video of it, but unfortunately a lot of the pitches are too high to really be heard clearly on the video, especially because there is some sort of humming and other noise in the background. It did work really well, and three of the capacitors were close in pitch, so the "song" was decent. One was extremely high and didn't really fit with the other frequencies because the capacitance was in a much different range. I wish that the video had turned out better, but I already took apart the organ and with exams this week I will not have time to film it again. Now, my independent research project is almost complete! Thanks for taking time to read about my struggles and eventual joys with electronics!
I will e-mail my final post shortly.

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Still Stuck

After some exam review today in physics class yesterday, Mr. Peterson looked over my circuit.  We're going to check the variable resistors after the exam Monday because everything else looked good and it still doesn't work.  I really hope that we can get it working then...

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Stuck

I switched out the variable resistors today and checked all the connections to be sure that my wiring was correct, but my electronic organ still does not work.  Mr. Peterson is not in class today due to his adoption, but I hope to ask him and figure this project out tomorrow!  Instead of working on the electronics of my project for the rest of the hour, I answered the questions that I will include on my final post, which regard the independent research as a whole.

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Thursday

Besides having part of a very large donut today in physics, I wired my electronic organ.  It didn't work when I tried it today, but I know that I misunderstood variable resistors, so hopefully it will function properly tomorrow once I fix it.  I will definitely try to post a video if I get it to make some different pitches.

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Voltage Controlled Oscillator Video

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Here is the video of the voltage controlled oscillator. You can hear the high frequency output of the speaker, powered by the circuit and 555 chip.

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Voltage Controlled Oscillator

It works!  And this circuit even makes noise.  I will try to attach a video of it soon. 
Questions for the Voltage Controlled Oscillator
1. Adjust the potentiometer.  What happens to the sound frequency as R3 is adjusted?
The lower the resistance, the lower the frequency.
2. Measure the voltage being applied to pin 5.
.75 V
The last thing I am going to make for my physics project is an electronic organ.  I really hope that it works and I am excited to see what happens.  I will start tomorrow.

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Astable Multivibrator Video

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This is a video of the astable multivibrator, which shows how it works. The LED light turns on and off because of the resistors and capacitors and the way that they make the voltage switch from high to low at intervals.

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Projects...

Yesterday we didn't have a lot have a lot of time to work on our projects due to a discussion about the exam, but I did begin to work on the next project.  There are no new questions, answers, or notes to post at this point.  I did take a video of the astable multivibrator yesterday, as well, and I hope to post it soon.

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Another Combined Post

Wednesday I gave up on the monostable multivibrator, but I got the astable multivibrator to work!
Astable Multivibrator Questions
1. What does the LED do?  How does this tell you that the astable is working properly?
The LED flashed on and off.  This makes sense because astable multivibrators are supposed to pulse at a frequency determined by the resistors and capacitor.
2. Change R2 to 100kΩ.  What do you think will be the effect of this change?
The pulse will be ten times faster.
3. What was the actual effect of the resistor change?
I was correct in question 2.
I finished these questions on Thursday in the last few minutes of class that we had to work.

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