如何焊接和拆焊

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Thread the component leads through the circuit board holes. Most components should lie flat, close to the board.
Double-check the orientation if the component is electrically directional (such as diodes, LEDs, and electrolytic capacitors).
Diodes normally have a bar indicating the cathode (-). LEDs have a shorter lead on the cathode (-) and a flat spot on the dome.

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