EMCC: GikFun SMD Soldering Practice

Hi guys! So I started this project to push my soldering skills further at EMCC and to document what actually happens while learning.

I don't have perfect close-up shots or ideal angles, but along the way, I ran into real problems that forced me to think and adapt.

This isn't meant to be a perfect step-by-step guide; it's more of a look into the process, the mistakes, and what I learned while figuring things out.

Soldering Iron

Solder

Solder Wick (Braided)

Flux Pen

Tweezers

Flush Cutters

When I first got the board, I immediately noticed how small and easy to lose the components were. Because of that, I decided to group them ahead of time.

At first, I didn't understand what the numbers on the board meant, so I had to look them up. I used the product's Amazon link. I realized they were component sizes, which helped me stay organized while working

This step ended up being more important than I expected, because once the components get mixed up, it becomes much harder to continue without confusion

At first, I thought it would be easier to remove all the components at once and sort them afterward, as with through-hole components. But after thinking about how small they were and how easily they could get mixed up or lost, I changed my approach.

Instead, I started taking components out one at a time as I needed them. This made it easier to stay organized and reduced the risk of scrambling everything.

This turned out to be a better method for me, especially since the smaller components are easy to lose or misplace.

When I got to this step, I decided to tackle the hardest components first, which were the two chips included in the kit.

When I first saw them, my initial thought was, "How in the world do I solder this thing in there?"

I started by soldering one corner pin first so I could place the chip and hold it in position. However, I ran into another issue: the solder I was using was 1mm thick, which felt too large for the small pads on the board.

To work around this, I changed my approach. Instead of applying solder normally, I briefly heated the pad, placed the solder wire over it, and quickly tapped it with the iron to leave a very small amount of solder behind.

Once I had a small amount of solder on the pad, I used tweezers to position the chip. I then reheated the first pad so the solder melted, allowing me to adjust the chip into the correct position.

After the chip was aligned, I soldered the remaining pins. I repeated this same process for both chips.

This helped me understand how important it is to control both the amount of solder and the placement before fully committing.

Doing these pads wasn't too bad, but the biggest challenge I faced was realizing how incredibly small the components were. This was where component handling really started to matter. I learned quickly that holding the resistors too tightly with tweezers could cause them to launch far from you.

As I continued soldering, I also learned that after attaching the resistor, I could reapply heat and gently press the component down to a better level and secure it onto the pads. This helped me improve the overall placement and consistency of the resistors across the board.

By the time I reached the 0805 components, I noticed that I was becoming much more comfortable with the soldering process. Compared to the 1206 resistors from the previous step, these required less solder, and I found myself naturally adjusting the amount I used based on what I learned earlier.

This was one of the first moments where the process started feeling more controlled instead of experimental. I was still careful with placement and heat, but I noticed that a lot of the movement and solder control was beginning to come from repetition and muscle memory rather than hesitation.

By the time I reached the 0603 components, I was much more comfortable working with smaller pads and using less solder overall. Compared to the previous steps, these components required even more precision because of the small surface area.

One thing I noticed was that my soldering speed naturally increased. Since the pads were smaller, they required less heating time, so I had to work more quickly and carefully to avoid overheating or damaging the components. I also noticed that the soldering iron maintained heat more consistently because less thermal transfer was required with smaller pads.

At this point, a lot of the process began relying on repetition and muscle memory. Instead of focusing on every individual movement, I started focusing more on consistency, heat control, and clean placement.

This is where precision really started to matter. I was surprised by how small the 0402 components were, almost the size of a grain of sand. Because of this, I had to use a much smaller amount of solder and work much more quickly to avoid overheating the pads.

Unlike previous steps where I placed the solder wire slightly above the pad, I changed my approach for these smaller components. I placed the solder wire directly on the corner of the pad and only lightly tapped it with the iron. Since the pads were so small. Even a tiny amount of solder was enough to fully coat them.

One thing I struggled with was aligning the component cleanly. Because the parts were so small, I stopped focusing on only the component itself and started using the tweezers as a positioning reference. I noticed that when the tweezers were perpendicular to the component, I could use the flat edges of the tweezers to align with the silkscreen marking on the board. This helped me keep the components straight without needing a magnifying glass or microscope.

At this stage, most of the process had become muscle memory. Other than making small adjustments during placement, the main challenge was balancing speed and heat control to avoid damaging the smaller pads.

When I reached the Q1-Q4 chips, I noticed they only had three legs, which changed how I approached soldering them. I decided to use the single leg side first so I could secure the component in place before soldering the remaining two legs.

After soldering the four chips, I handed the board to another classmate so she could inspect the work. During that process, two of the chips fell off the board completely. We ended up searching the floor for the components because of how small they were, but they could not be found.

At that point, I realized my solder joints were not as secure as I originally thought. With the help from the professor, I learned that lightly tapping the board against the table can help reveal weak solder joints on delicate surface mount components. This became an important inspection method throughout the rest of the project.

I resoldered replacement chips from a donor board and tested the joints again. While inspecting the board, I also noticed one of the chips looked uneven. I realized that while aligning the component, the chip was sitting too high above the pad instead of fully settling into the solder. To correct this, I reheated the pad and gently pressed the component down into position.

While searching for the missing chips, we also researched the component and learned that the part functioned as a transistor. This meant I did not necessarily need the exact original chip from the kit, since compatible replacements could be sourced from donor boards or ordered separately using the component part number.

When I started soldering the 4 corner LEDs, I ran into a weird muscle memory issue. By this point, I had soldered so many resistors and capacitors that I almost forgot these components actually had polarity.

When I noticed the thicker silkscreen marking and the green line on the LED, I realized I had stopped thinking about orientation and started relying too heavily on repetition. Most were shaped in a way that made placement obvious, so I got too comfortable moving quickly.

I ended up doing a quick Google search to double-check the polarity markings and confirmed that the thicker marking represented the negative side, along with the green marking on the LED itself. It was a little embarrassing at first, but it also reminded me that muscle memory can sometimes make you skip important checks when you get too comfortable with repetitive work.

These LEDs also felt more delicate than some of the earlier components because of the plastic housing. I noticed that squeezing too hard with the tweezers could easily damage or launch them across the table, so I had to ease up a bit and focus more on controlled placement rather than speed.

Once I identified the polarity correctly, the soldering itself went smoothly. At this stage, most of the actual soldering process had become muscle memory, but this section taught me that even when you get comfortable, small details like polarity still matter a lot in SMT work. Sometimes the parts are so small that it becomes easy to stop consciously checking orientation unless you deliberately slow yourself down for a second.

When I came across the diodes, I was initially confused about what I was looking at. The diodes appeared cylindrical and made of glass, which made me hesitate to apply heat to them. Since they were cylindrical, I was also worried they would not sit properly once solder was applied.

I remembered from the previous LEDs and diodes that the marking on the component represented the negative terminal. Because the diode could easily move during placement, I used tweezers to hold it in position while soldering.

I also applied flux to the sides of the diode because I realized there was not much flat surface area making contact with the pads. By adding additional flux to the sides, the solder was able to flow not only onto the bottom contact areas, but also slightly up the sides of the component. This helped secure the diode in place and improve the stability of the solder joint.

The middle components were challenging mainly because of component handling and board spacing. By this point, I had already lost a few LEDs and could not recover them.

I also had trouble navigating the soldering iron around nearby components after soldering was already applied to the pads. Since I completed the middle section after the outer areas, I had to be careful not to accidentally desolder nearby components while working.

The remaining LEDs introduced another challenge because they were smaller and harder to accurately bewteen surrounding parts. To work around this, I adjusted the angle of my soldering iron and became more deliberate with component placement.

The resistors and capacitors in this section were easier to solder because their size made it easier to see where the iron tip was contacting the pad. The LEDs were more difficult, mainly because of their smaller size and the tighter working area around them.

This project taught me a lot more than just how to solder smaller components. At the beginning, I was mainly focused on simply getting the parts onto the board. Still, as the project continued, I started paying more attention to heat control, component alignment, solder amount, polarity, and overall consistency.

One of the biggest things I learned was how much SMT soldering depends on patience and controlled movement. Many of the smaller components forced me to slow down and think differently about placement, especially when working around already-soldered parts.

I also learned that mistakes are a normal part of the process. I lost components, accidentally created weak solder joints, and had moments where muscle memory caused me to overlook important details like polarity. However, those mistakes helped me better understand the process and improve my technique over time.

By the end of this project, I noticed that many of the movements that originally felt difficult had started to become muscle memory. The process became less about guessing and more about understanding how the solder, heat, and components interacted.

Overall, this project helped me become more comfortable with surface-mount soldering and gave me a better understanding of how precision, inspection, and repetition affect electronic work.