How to solder the four-pin key switch?

four-pin key switch Wide range of applications. In household appliances, electric fans, microwave ovens, televisions, electronic fat scales, rice cookers and electronic kitchen scales, etc.; monitors, video interphones, etc. in security products; voice recorders, cameras, etc. in computers; medical equipment Call systems, sphygmomanometers, thermometers, etc., massage chairs in fitness equipment, running machines, etc., in these fields, the four-foot button switch is involved in applications. In

Classification：Key switch news

Author: AUGO Electronics

Release date：2022-02-20 21:46:35

four-pin key switch Wide range of applications. In household appliances, electric fans, microwave ovens, televisions, electronic fat scales, rice cookers and electronic kitchen scales, etc.; monitors, video interphones, etc. in security products; voice recorders, cameras, etc. in computers; medical equipment Call systems, sphygmomanometers, thermometers, etc., massage chairs in fitness equipment, running machines, etc., in these fields, the four-foot button switch is involved in applications. In addition, there are many aspects, and it can be seen from the application range of the four-foot key switch that this switch will be more widely used in the future development. So how should the four-pin key switch be soldered?

Welding with four-pin buttons open:< /span>
1. Adjust the multimeter to the diode
2. First measure any two feet in the four corners to determine which two corners are connected and which two corners are disconnected
3. Press the button and measure any two feet to determine which two corners are connected and which two corners are disconnected
4. Begin to disconnect, press the button and the conductive feet can be used as two corners for welding
According to experience, generally as long as the diagonal can be directly welded.

The picture above is the wiring diagram, pins 1 and 2 are one end, pins 3 and 4 are the other end, and different manufacturers have different markings.
The tact switch is to press to turn on the circuit, the circuit is still connected after the hand is released, and the circuit is disconnected by pressing it again;
Due to the small size of the components and the poor mechanical strength, in order to reliably connect the circuit and reduce the contact resistance, two sets of contacts are used to work in parallel, so there are 4 pins, instead of the relay, one set is normally open contact, the other set is a normally closed contact.
The structure can be distinguished by the resistance file of the multimeter, or the manufacturer's information can be searched by model. Key switch works, that is, when the key is pressed, the two patches are close to each other , that is, it is turned on; when it is released, the patch is separated, that is, it is disconnected.
Regarding the welding of switches, it is necessary to confirm the conditions at the time of production. Due to different production conditions, the load applied to the terminal, deformation and deterioration may also occur, so be sure to pay attention to this point when using it. For the influence of thermal stress on the four-pin key switch, it is necessary to make sufficient preparations for confirmation before use; during the second welding process, please wait for the key switch to return to normal temperature after the first welding. After the secondary welding, if it is continuously heated, the shape of the four-pin key switch will be changed, and the terminals may also loosen and fall off, resulting in reduced electrical characteristics or damage. The resistive load of the four-pin key switch is pre-designed. Please confirm it when using other loads.

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