In addition to the difference in power, the larger key switch and the smaller key switch also have some small differences in their internal structure. Due to these small differences, their functions are different. In fact, the keys The main function of the switch comes from the internal structure of the key switch. The internal structure design is different, so the effect it achieves will be relatively different.
The large key switch will have more internal space for the small key switch, so many functions will be more comprehensive in the design, and the required components are equivalent to more, which is also a lot of The main reason for choosing a large key switch is not to choose a small key switch. Of course, some people will choose some small key switches to use in order to save money and effort. The specific price depends on their materials. For screening, some small key switches are also more expensive, and of course, the use time will be longer.
Precautions when soldering key switches
Note 1:
When the key switch is mounted on the board, since the board powder that may be scattered during the work and installation may enter the switch, be sure to add this point to the operation. And before the installation of the key switch, it must be ensured that the surrounding environment is clean and there is no excessive debris.
Note 2:
When the key switch is used for reflow soldering, be careful not to let the foaming flux contact the printed circuit board on the switch installation side. If there is foaming flux on the substrate, it will enter the switch and cause poor conduction of the touch switch, thereby reducing the conduction of the switch. performance.
Note 3:
Since the base of the key switch is not completely sealed, pay attention not to let some moisture, dust and sundries enter when installing the switch. For example, when installing in some places with too much dust, a layer of relevant protective film must be covered before the cover of the switch is installed to avoid the intrusion of dust and sundries.
Note 4:
The welding preheating temperature of the key switch is generally recommended to be below 100 °C, and the temperature during the welding operation should be controlled at 260 °C, and the post-welding time should be completed within 3 seconds. If the welding time of the switch is too long , it is easy to cause the terminal feet to be soldered through or damaged, so more care should be taken in the aspects of soldering time and soldering temperature.
Note 5:
In the process of repeatedly welding the tact switch, it should be stopped for three minutes between the first operation and the second operation, and after the solder joints of the switch have been sufficiently dissipated, the second welding should be carried out after returning to normal temperature. Otherwise, continuous welding at high temperature will easily cause the welding feet of the tact switch to be deformed or damaged. Therefore, the temperature environment should be ensured during the welding process.
