You can see in chronological order the work carried out during the semester in the laboratory.
Main board
We discussed the different parts of the main board and primarily how to identify GND in it.
Soldering iron
First we learned how to use the soldering iron and how to change its tip
Desoldering
I desoldered capacitors from a broken power supply and measured their capacitance value to see their state after separation. Some examples appear in the following images:
SMD Solder
I learned and practiced SMD soldering for different sizes of components in a soldering kit. In the image, you can see the soldering of some of the resistors and how I was measuring their value.
Disassembling electronic devices
You can see step by step how we disassemble the following device.
ATX
I converted an ATX power supply I picked up from a recycling center into a DC power supply. First, I checked that it was functioning correctly using a power supply tester. Then, I used a drill to make the holes for the banana connectors. After, I installed the banana connectors and soldered the wires for the different voltages and GND (as we know, each color represents a different voltage) to their corresponding banana connectors, making sure to solder the green wire to a GND wire so that the power supply turns on when plugged in. Finally, I closed the casing and successfully built my own power supply.
LED strips with SMD components
From the schematic, we selected the components needed for the project. The protection diode was discarded, as it was unnecessary for the circuit configuration, and it was replaced with a short made using solder. Similarly, the capacitor was also omitted since it was not required for the application. Once the components were selected, we proceeded with the assembly process. First, I used a stencil to apply solder paste onto the strips and then placed the components (resistors and LEDs) on top using tweezers. After that, the assembly was placed in the oven, where the components were soldered. Finally, I soldered the short and the power supply wires. During this process, I also learned how to use the microscope.
In the following video, you can see how the input voltage is gradually increased to the recommended level, and as a result, the LEDs light up and increase in intensity.
Christmas tree
I had an old soldering kit that was already assembled, where the green LEDs barely lit up. I redesigned the resistors to allow more current to reach them. I desoldered them from devices in the lab and soldered them onto the tree.
Disassembling a tablet
I learned how to disassemble a tablet and placed the pieces on a foam board as I separated them.
The vertices were 3D printed, and I assembled the octahedron with them and wooden sticks.
Integrated Project
This section contains my integrated project: BANGOD CLOCK SOLDER KIT.
It consists of a clock with an alarm, LED lights, and a temperature sensor. I carried out reverse engineering. Using the available information about this product, I created the schematic in Altium, updating it to make it more in line with current technology. Then, I moved on to designing a box in SolidWorks to contain it, in this case, much larger than the original and made of transparent plastic so it could be marketed not only as a clock but also as a decorative item, as the consumer will be able to showcase their soldering work. Finally, in Altium, I created the PCB.
