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Soldering is the metallurgic process used to fix electronic components to a PCB, usually with a tin alloy. Soldering can be done by hand or automatic. PTH boards were usually wave soldered, SMT uses reflow technology.

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Are all negative terminals on a PCB effectively the same?

I'm repairing my 3D printer for the third time, and the previous 2 breakdowns and repairs, including my terrible soldering, have left the negative terminal for the power in really bad shape. … I believe a combination of the breakdowns and my poor soldering has damaged the board a bit around the pin. …
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