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Make DIY PCB Professionally
Stuck in the mode of continuous improvement (what people at Toyota called Kaizen), I was always on the look out to see how others make PCB boards, hoping to learn something good. The following is a professionally made video on an admirable DIY PCB fabrication process.
One important point in the video is to use liquid tin coating to improve solderability and protect against oxidation. This significantly reduces the probability of making cold solder joints.
Meanwhile, a potential fatal flaw is soldering mask not being applied. When soldering a pad like this, you’ll have to be very careful with solder bridges forming between copper tracks.