User:Javiereduturcios/myWork2

''This is designed for a person working on a project for 4 weeks as part of a 3 credit class. Please copy this form to your user page. Then delete everything in italics when filling out this form.''

Write problem/project Goal
Repairing a power supply, which is already converted to a LAB one

My First Task
read the wikiversity of previous semester classes and do research on power supply

Summary of actual work over first weekend
I research about Power supplies and i found a tutorial on how to do it.

Week1 Narrative
During my first week working on power supply my classmate said that there was only one power supply left. The so the first thing we did is to take the screws off. This power supply is a lab power supply so our job was to fix it. After taking all the screws we had to check that there is voltage in the input. There was voltage in the input. Then later we had to follow the circuits and see were there is no circuit. It was kind of challenging. On Thursday when we did our presentation Mr. Foerster said that we should stop working on it because it was very difficult for us and even for him. We when down stairs to bring computers and take their power supply. To be able to take the power supply of the computer one must first take the CPU. The dell computers have a slide that allows to open the lid. After opening the lid one should pull all the cables that are connect to the computer and the power supply. Later remove all the screws that are near the power supply. Then after removing the screws pull the power supply and one is ready to work on it. The next thing i did was to cut the cables that were sticking out to make them smaller. Later I remove the screws from the shield power supply to be able to make the holes on it. The holes can be done anywhere. I thought that i would be easier to do make them in the shield of the power supply. I put the shield of the power supply in the vise grip that is the corner of one of the wooden tables. I put the smallest drill bit in the drill to begin with and gradually increasing the size of the drill bit. I had a cup of water near me so that when metal chips start coming the water will stop them from getting into the air. I made the holes as big as the circumference of the binding post. After putting the binding post to the power supply shield i started working with the cables. I connected the 5 ohm resistor to a black wire and a red wire. Then i started put all the black wires together and i put the green wire with them. After i took all the white and yellow cables together. I took the voltage and it was 11.98. So later i gather all the orange wires and at last all the read wires together. When I took the voltage of the red wires it was 5.09volts. Then when I took the voltage of the orange wires there was no voltage. At last i took the voltage of the white and yellow wires and voltage was 5.03volts. This is strange because previously I had a voltage of 11.98volts. The voltage did not was not what i thought it would be. The only wires that are working properly are the red and black wires The have the proper voltage. The solution i have to this problem is that i confused some of the red wires with the orange wires this could affect the voltage of the white and yellow wires.

My Second Task
my second task is going to figure out why the voltage was not what i expected

Summary of actual work over second weekend
I figure out why I did not get correct voltage. I had some of the orange cables mixed with the red cables.

Week2 Narrative
During this second week I was able to discover why I did not get the voltage that I expected. I had some of the orange cables mixed with the red cables. I also had the only green wire tied up with all the black wires. It should have only been to one black wire. So I began to separate the orange and red cables. Later I tied the only green cable to one black wire. After with electrical tape i taped all the orange and red cables. I cut a large wire of a black, red, orange, blue and white wires. This will be easier when I tried to solder the cables to the binding post. I tied with electrical tape the large wires with the small wires. I started to strip the big wire. I put the cables in the binding posts and start to solder. I solder the black binding post to the black wire. the orange (3.3volts) is solder to the following binding post. Then the red cable(5volts) was solder besides the orange cables. After the white and yellow cable (12 volts) was solder to the following binding post. At last the blue cable was the last one. I did it with order because I wanted to from least to greater on the positive volts. After all The positive volts were done I put the only negative volt. When everything was completely solder I put the power supply shield back on. I tighten the screws and tested if it really works. It is important to tested because other groups complain that the power supply is not working. I got the results the expected results. Then I label the binding post. Starting with the black and going on (G, 3.3, 5, 12 and -12). this is going to help people know the voltage that is expected from each binding posts. Now this power supply works perfectly fine! I also elaborate to 6 tutorials on power supply.
 * Testing is the power supply works
 * Testing if the power supply does not work
 * Tutorial to drill holes on the power supply shield
 * Tutorial on charging the drill's battery
 * Tutorial on removing the power supply from the computer
 * Tutorial on measuring the voltage with the multimeter



My Third task
I am going to work with a rectangular power supply the one that i worked before was square.

Summary of actual work over third weekend
I started working on the rectagular power supply. I took off the power supply shield and reduce the sizes of the wires.

Week3 Narrative
During my thrid week working on my power supply I am almost ready. I the first thing i did was to take the shield off the power supply. Then I started drilling holes. Then the next thing was to remove the gray wire. This wire is unecessary. With the wire stripper I cut the gray wire. After cutting the wire I tape the remaining piece with electrical tape. The purple wire is also useless. I remove it with the wire strippers. The left over that is still left in the power supply I taped it with electrical tape. To be able to turn the power supply on the green wire must be connected to one black wire. I reduced the size of the wires because they were very big compared to the small power supply. Then i started stripping the wire. I put them together and tape them with the electrical tape. Then I gather all the black wires and tape them. I had to reduce the size of each wire because i was to long. Later I start stripping one by one each black wire. i connected them together. With a long piece of the black wire that i cut previously I started stripping it. I tied up that black wire with the rest. then I taped it. I started to the same process for the yellow, orange and red wires. The blue wire is not necessary to this because there is only one wire.

My Fourth task
My next task will be to solder the wires and test it if it works

Summary of actual work over fourth weekend
I was not able solder the wires because I did not have a solder home.

Week4 Narrative
I took the challenge to work with a rectangular power supply. I this week I had to solder the wires in the binding post to secure that the power supply was going to work. 1. I had the long wires connected to the short wires. 2. I Grab the wire stripper and start stripping the long wires. 3. I connected the long wires to the binding post. 4. I set up the solder to heat up. (This took a couple if minutes). 5. I the solder wire. 6.I cut a big piece of the soldering iron. 7. When the solder was heated up I started soldering the wires into the binding posts. When I was done with the binding post I was going to close the power supply and tested. I had a problem: I was not able to close the power supply because there is no room. The possible solutions that I came with are 1. Reduce the size of the wires. 2. Leave the long wires inside only. 3. Put the fan on top. After I tested each of the my solutions I was still not able to close the power supply. I had to examine very carefully why I was not able to close the power supply. The problem was is that the place were I drill the holes and put the binding post were not allowing it to close. The possible solution that I came up with that I need to build a box for the board. I also elaborate 7 tutorials on the power supply:
 * Binding_post_not_allowing_it_to_close.JPG
 * Fan not allowing it to close.JPG


 * Tutorial on how to convert ATX Power Supply to lab power supply
 * Tutorial on how to solder
 * Tutorial on how to put the cables together
 * Tutorial on how to turn the power supply
 * Tutorial on reducing the size of the the purple wire safety
 * Tutorial on reducing the size of the gray wire in a safe way
 * Tutorial on preparing the multimeter for start measuring the voltage

Complete Team Page
Fill out the Team Form (should have already copied the form, created the team page, linked to it and started filling it out).