1. Select suitable solder, low melting point solder wire for welding electronic components should be selected.

2. Flux, use 25% rosin dissolved in 75% alcohol (by weight) as flux.

3. The soldering iron should be tinned before use. The specific method is: heat the soldering iron, and when the solder can be melted, apply flux, and then apply solder evenly on the soldering iron tip, so that the soldering iron tip can be evenly coated A layer of tin.

4. Soldering method, polish the pads and component pins with fine sandpaper, and apply flux. Dip an appropriate amount of solder with the tip of the soldering iron and touch the solder joint. After the solder on the solder joint is completely melted and immersed in the component lead, the soldering iron tip is gently lifted away from the solder joint along the lead of the component.

5. The welding time should not be too long, otherwise it is easy to burn the components. If necessary, use tweezers to clamp the pins to help heat dissipation.

6. The solder joints should be in the shape of sine wave peaks, the surface should be bright and smooth, without tin thorns, and the amount of tin should be moderate.

7. After the soldering is completed, use alcohol to clean the residual flux on the circuit board to prevent the carbonized flux from affecting the normal operation of the circuit.

8. The integrated circuit should be soldered last, and the electric soldering iron should be reliably grounded, or use residual heat for soldering after power failure. Or use a special socket for integrated circuits, and then plug the integrated circuit after soldering the socket.

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