Nicole’s posterous

Today I built my monostable multivibrator, though I'm not sure if it works right yet.

Click here to download:

09 Post.odt (7 KB)

Here are some more notes from today. I also started on this chapter's projects and will continue tomorrow.

Click here to download:

09 Post.odt (9 KB)

This is a two in one post because again I forgot to give an update.
On Wednesday, I was only in class for about 30 minutes because of an appointment. I realized that my optional project did not work and tried to fix it because the display does not work at all when 5 volts are applied, but had no luck.
Today, Thursday, I gave up on my optional project because it still does not work and I have many other things to do to complete my project which are more important. Maybe someday I will try to get it working again. I began to take a few notes on the next chapter, Clocks, today, as well. The notes are attached.
 

On Monday, May 11, I wired the circuit for my optional project, the electronic dice game.  Today I'll see if it works!

After rewiring the circuit, my opto-coupler works, though the numbers are still reversed as they were in an earlier project.
Questions for Opto-Coupler Project
1. Remove one end of resistor R5.  This shurts off the opto-coupler.  What is the effect of this?
The screen goes dark.
2. Change the settings of the binary switches and reconnect R5.  What happened?
The readout displays a different number.
Is this what you expected?
Yes
I will begin my optional project, the electronic dice game, on Monday.

Questions for Logic Probe #2 (continued)
3. Can you decide what would happen if a digital pulse were applied to the probe?
The display would flash back and forth between 1 and 0.
Explain how this would work.
The digital pulse will supply high then low power and keep alternating between these two.  If there is high power, the display shows the small bottom left line (1).  If there is low power, the display shows the small upper square (0).

I wired my Opto-Couplers circuit today,, but I am having a bit of trouble getting it working with the Opto-Coupler.

The picture with the display showing the number four is the decoded 7-segment readout.
The picture with the display showing a small zero is the logic probe.

   

Click here to download:

Two_Pictures.zip (174 KB)

Questions for Decoded 7-Segment Readout (continued)
4. Use the logic probes made earlier to determine the loci state of the inputs and outputs of the 7448 decoder.
"7"
Input: 7, 1, 2--L, 6--H
Output: 13, 12, 11--H, 10, 9, 15, 14--L
"4"
Input: 7, 1, 6--H, 2--L
Output: 12, 11, 15, 14--H, 13, 10, 9--L
"3"
Input: 1, 7--L, 2, 6--H
Output: 13, 12, 11, 10, 14--H, 9, 15--L

Questions for Logic Probe #2
1. Touch the probe to the 5 V source.  What happens?
The display shows one vertical line in the bottom left corner.
2. Touch the probe to the source ground.  What happens?
As in the picture, there is a square (or zero) shown by the display on the upper half of the readout.

I will add pictures of these two circuits from another e-mail address.

Today I finished wiring my display based on binary number input.
Questions for Decoded 7-Segment Readout
2.  If any binary number above 9 is made by the witches what happens to the 7-segment display?
Somehow I wired my decoded segment readout backwards, so when I make the highest binary numbers, the output is small number readouts, such as 0 and 1.  I received the same readouts as are in the chart on pg. 12, just with the lower numbers reversed.
3. Compare the chart from #2 to the one provided by the maker of the decoder.
As stated above, this is the same as my chart, but reversed.
Tomorrow I will finish these questions and begin wiring my last project circuit for this chapter.

Today I completed the questions for one project and wired another circuit. The answers to these questions and a picture of the circuit are included below.
I do not have any circuit drawings to share. They do not need to be included with these projects.
Questions for Binary Numbers Display Project
1. What switches must be turned on to make the number 2? 2 What switch must be turned on to make the number 3? 1 and 2 What switch must be turned on to make the number 5? 1 and 3 What switches must be turned on to make the number 13? 1 and 3 and 4
2. What is the maximum count that can be achieved with 3 LEDs? 7 With 5 LEDs? 31
3. What is the relationship between the maximum count that can be achieved with a number of LEDs and the weight of the next LED if it were added? The weight of the next LED added is one more than the maximum count achieved with an initial number of LEDs.