User:Kmashaye5220/enes100/myWork

Link to team page.

Write problem/project Goal
Developing power supply apparatus solutions for other projects.

Converting a computer power supply to a lab power supply.

My First Task
I am going to try to connect a power supply to a digital circuit in order to make it work. All power supplies produce maximum 12 volt, but I need 24 volt for my circuit. Therefore, I should connect two power supplies in a serial form to produce the proper voltage.I need some Resistance to have a proper current.( I need to produce 1.2 Amp for the specific circuit.)

Summary of actual work over first weekend
I find out the new purpose of the project which was converting a computer power supply to a lab one.

I made holes, attached binding posts to the them. connect all same-color wires together; one black to green wire. I measured the voltage of each bunch of wires.

Week1 Narrative
First, in class, I made 4 holes in one side of the power supply and attached 4 binding posts to them.

I took the power supply, power cable, a 10 Ohm Resistor, and a multimeter home. I connected the resistor to a black wire and a red wire. I connected another black wire to the only green wire. then, I gathered and connected all remaining black wires together. I did same for red wires, but I connected the only purple wire to them as well. I did same for orange wires; also, I connected them to the only brown wire. moreover, I connected all yellow and white wires together. in addition, I kept a black wire for connecting to a LED with the gray wire. Finally, I measured the voltage of each bunch of wires by multimeter. here is the results:

Black: Ground. Red: 5 volt. Orange: 3.3 volt. Yellow and White: 12 volt. And Blue: -12 volt.

According to results, the power supply should have 5 binding posts which already has 4.

I also uploaded a video which shows my work. Here is the link of my youtube video:

[| Power Supply Video 1]

My Second Task
I've got to attach another binding post. Also, because there are many wires and it is difficult to gather them in a small place, I want to make 5 new holes on the opposite side of the power supply and attach binding posts to them; therefore, I'll have more space for wires. In addition, I will make a tiny hole for LED. Finally, I will connect wires to binding post and the power supply will be ready.

Summary of actual work over second weekend
On Thursday, I made holes bigger and connected 5 brand-new binding posts to them. since, the power supply was almost done, I took another power supply home for converting it to a Lab power supply. I took apart it and did same as the previous one. I connected two 20 ohm power resistors in parallel form to get 10 ohm ,then I connected a red and a black wire to them. After that, i connected a black wire to the green wire to turn the power supply on. Next, I gathered and connected all remaining same color wires together. Finally, I determined the locations of binding posts and LED on one side of the power supply by pen.

Week2 Narrative
I took apart the power supply. I connected two 20 ohm power resistors in parallelform to get 10 ohm because I couldn't find a 10 ohm power resistor. I cut sockets and all wires to make them shorter. I connected a red wire and a black wire to the resistors and stuck them inside the case of the power supply. I connected the green wire to another black wire to turn the power supply on. I gathered all same-color wires together, made them shorter, connected them together, and finally connected a same-color piece of wire to each bunch of wires to make them long enough to reach the binding posts and to make my work more organized. After that, I wrapped the bunch of black wires, red wires, yellow wires, and orange wires together and placed them in the space I got in the power supply. At the end I had, a blue wire, a brown wire, and pink wire. I knew the blue wire is -12 volt, but I was not sure about the rest;therefore, I checked them by multimeter, I used each with ground, but I got 3.3 volt for brown and 5 for pink, so I connected the pink to the reds, but the power supply turned off and didn't turned on for about 15 minutes, so I realized I did something wrong. I guessed that the pink could be -5 volt and brown -3.3 as well. I turned on the power supply on and I connected the multimeter to pink and the reds. It showed 0, so I found out that my guess was correct. I did same for brown and orange and got same result. Finally, I determined the locations of binding posts and LED by pen. I need 7 binding posts: Black as ground, yellow as 12 volt, red as 5, orange as 3.3, blue as -12, pink as -5, brown as -3.3.

After measuring the pink and the brown by multimeter and comparing with the red and the orange, I realized they are same, so i need 5 binding posts.

I have added new pictures.

Also, I've uploaded a video on YouTube. Here is the link of the video which shows my work:

Converting the second power supply

My Third task
I am going to drill 5 holes and attach binding posts to them, make a tiny hole for LED, connect the gray wire to its cathode and connect a black wire to 330 ohm resistor while the resistor is connected to the LED's anode.

Summary of actual work over third weekend
In class, I connected a 360 ohm resistor to a LED and a black wire. I connected the gray wire to the cathode of the LED. I drilled a tiny hole and put the LED in it. I also drilled 5 more holes and attached the binding posts to them. Then, I connected each wire to each binding posts and checked their voltage by multimeter. Finally, I closed the power supply and stuck a label under binding posts and wrote their voltage on it.

Over the weekend, I took the 3rd power supply home. I did exactly same process. Connecting all same color wires, connecting a balck and a red wire to two 25 ohm power resistors, connecting the green wire to a black wire, connecting a 360 ohm resistor to a black wire and a LED, and connecting the gray wire to the LED.

Week3 Narrative
In class, I connected a 360 ohm resistor to a black wire, then connected its other leg to anode of the LED. Next I connected the gray wire to cathode of the LED. For determining the anode and cathode of the LED, I used the diode feature of the multimeter. I put the mutimeter on diode and connected it to the LED. The LED turned on, so I figured out which leg is cathode and which is anode. After that, I wrapped them by electrical tape. Then, I drilled a tiny hole for LED and placed it in it. Next, I drilled 5 holes and attached 5 binding posts to them. Then, I connected each wire to to each binding post and screwed them. After that, I put a label under binding posts and wrote their voltage. Finally, I checked their voltage by multimeter for making sure that they work properly and closed the power supply and screwed it. I do not know the reason, but the LED blinking when the power supply is on, instead of being solid on. I guess it is related to the brand and model of power supplies.

I've added some pictures.

My Fourth task
I am going to drill 5 holes and attach 5 binding posts to them and connecting wires to binding posts. also, I will Drill a hole for the LED, label binding posts, and done!

Summary of actual work over fourth weekend
In Class, I drilled 5 holes and attached binding posts to them. I also drilled a smaller hole for the LED. I connected each wire- black, red, orange, yellow, and blue- to a binding post and soldered it. Then, I placed the LED in its hole and closed the power supply. Then, I labeled the binding posts. Finally, I checked the power supply.

Week4 Narrative
I held the power supply by vise and used 3 different size drills. I also put the drill, which I used, into a glass of water from time to time to cool it down. It really worked and I easily and neatly drilled holes. Then I attached binding posts to the holes tightly. Next, I connected each wires- black, red, orange, yellow, and blue- to each binding posts and soldered them. After that, I put the LED into its hole, closed the power supply, and labeled the binding posts. Finally, I checked the power supply by multimeters.

Complete Project Page
My teammate and I have converted 3 ATX power supplies to LAB power supplies. All of them work properly.