The working principle of the plug-in touch switch:

The working principle of this switch is actually similar to that of a key switch. It is composed of a combination of normally open contacts and normally closed contacts. In the plug-in light touch switch, the effect of the normally open contacts is that when the pressure changes to the normal When pressure is applied by the open contact, the circuit appears in an on state.

When the pressure is revoked, the original normally closed contact is recovered, which is the so-called disconnection. This pressing force is the action of turning the button on and off with our hands. All in all, the working principle of the four-pin plug-in tact switch is still well understood. How to choose plug-in touch switch with eyes:

The quality of the switch will directly affect the application of the product. Therefore, when choosing a plug-in touch switch, pay attention to its solderability, protection, conduction and other physical properties. Whether the service life is durable, whether the touch is rough, whether the electroplating is oxidized, these external surface elements will also be affected. Decide whether the plug-in touch switch is good or bad.

In order to reduce resistance, tin plating and silver plating are used on the pins. Therefore, for high-quality plug-in light touch switches, the thickness and process of tin plating and silver plating on the pins must be controlled. The final tin plating and silver plating is 0.3um Above, thin tin and thin silver are 0.2um, and 0.1um is white-plated. After the plug-in tact switch is tinned and silver-plated, does its protection have the function of waterproof and dust-proof? Otherwise, even the best tin-plated and silver treatment will be oxidized by the air!