Here is a video of my optional project for the clocks section of electronics. I would have uploaded the one where Mr. Peterson, Alex, and Kristin were laughing but it was too long and unfortunately g-mail could not handle that big of a video :D. This project is kind of like the voltage controlled oscilator except you can chage the pitch with the switches as well as the resistance oscilator.
1. Adjust the potentiometer. What happens to the sound frequency as R3 is adjusted?
It goes up and down, making the pitch change
2. Measure the voltage being applied to pin 5. Adjust the pot to give the highest possible voltage.
5V
3. Now adjust the pot for the minimum voltage to pin 5. The voltage is....
5V (I was not able to actually measure this because I could not replicate what I had built two days ago...but wouldn't the voltage be the same at pin 5 no matter what the pot is set at? because the pot is between pin 5 and the ground, so the current would be the same at pin 5 and then be changed just before it goes into the ground)
4. The output frequency is highest when the control voltage at pin 5 is....
Again, I was not able to test this, but I would assume it would stay at 5V
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Here is the video of the sound I got from assembling the voltage controlled oscillator
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1. What does the LED do? How does this tell you that the astable is operating properly?
It blinked off and on
2. Change R2 to 100KΩ. What do you THINK will be the effect of this change?
I think the LED will stay lit for longer
3. What IS the ACTUAL effect caused by the resistor change?
The LED does not turn off...it stays on (it might actually just have a longer blinking time, but I waited a while and it never turned off, so it appears to stay on all the time)
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The LED blinks off and on when connected to a 5V power source
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1. Momentarily bring pin 2 of the 555 low by touching it to ground. What does the output do?
Nothing...te LED stays lit
2. After the LED goes off, do this again and time the LED to see how long it remains on.
5 seconds
3. Use this formula to calculate how long the LED should stay on: t=R1 x C1
4.7 seconds
Does this agree with the time the LED was actually on?
Yes
4. Cause the LED to light and touch pin 4 to the ground before the LED would normally turn off. What happened?
The LED turned off
5. Change the value of C1 to 0.1 µF. What do you think will be the result of this change?
The LED will only stay on for 1 second
6. Repeat all the above steps to determine the actual effect of making capacitance change. What happened?
I was correct...the LED stayed on for 1 second instead of 4.7 seconds
7. You may also wish to change the value of R1 to see its effect. What happened?
No, I do not have time to do that right now
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When I pull the 'input' wire from the 5V source, the LED lights up...but when I plug the 'input' wire back into the 5V source, the LED stays lit for a short period before turning off again
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In this picture, both the red (the "no" light) and the green (the "yes" light) are lit up...but when I unplug the wire from pin #3, one light will turn off while the other stays on...this is how it simulates a 'decision maker'...you ask it a question, pull out the wire, and it will give you either a yes or a no
1. Did you find that your LED cathode was easy to recognize?
Yes the cathode was the shorter leg
2. Why do you think the first logic probe isn't very good?
Because it didn't
3. Was the second logic probe that much better than the first?
It did not draw its power directly from the source it was testing, so it therefore gave a better readout
4. What is the largest decimal number that can be represented by a 6 bit binary number?
63
5. Write the decimal numbers 5, 23, 87, and 132 in binary.
101, 10111, 1010111, 10000100
6. Why does the 7-segment readout produce "funny" symbols for inputs to the decoder of 10 to 15?
Because it only has seven available spaces, and the numbers 10-15 require more than those 7...so it creates different patterns for those numbers
7. Draw the schematic of an opto-coupler wired to control a 120 motor.
8. What specifications do you think are most important to understand when buying opto-couplers?
The amount of power it will be able to handle, maybe its reaction speed
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1. Remove one end of the resistor R-5. This shuts off the opto-coupler. What is the effect of this?
It should close the switch and therefore turn off the lights, but for some reason, my display would not light up at all...I checked all the connections and made sure they were just like the book, but I still could not get the display to light up while using the opto-coupler....When I connected the 330 ohm resistor from the displsy directly to the ground, the display would light up according to the switches....but when I tried to run the current through the opto-coupler, nothing would happen.
2. Change the settings of the binary switches and reconnect R5. What happened?
As I already explained, my display does not work, but I think the display should automatically light up according to the binary number you put the switches at.
3. Is this what you expected?
I can't try it, but yes, I think what I expect, will be what I expected :D
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1. Touch the probe to the 5V source. What happens?
A line on the 7-segment display lights up
2. Touch the probe to the source ground. What happens?
Nothing happens
3. Can you decide what would happen if a digital pulse were applied to the probe?
The same thing would happen...the probe would be true because a pulse is a pulse....whether analog or digital
4. Explain how this would work?
I don't really know
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