To ensure accuracy, it is recommended to measure the continuity of each pin with the "diode, resistance, buzzer" of the multimeter before use.
Under different conditions or different environments, the four-pin key switches used will be different or different. This requires a fairly familiar grasp of the specifications and models of different series. The main specifications of the four-foot key switch are side-plug type, patch type, plug-in type, etc. In addition, there are 8*8 series waterproof switches, 6*6 series waterproof switches, 10*10 series waterproof switches and 12*12 series waterproof switches. Four-legged key switches of different specifications have different model series. For example, 6*6*5.5/12/10/13/4.3/17/21/26mm and other four-pin key switches.
The working principle of the four-pin key switch
How to wire the four-pin key switch div> 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 connect the circuit, the circuit is still connected after the hand is released, and the circuit is disconnected by pressing it again; the key switch is to press to connect the circuit, and the circuit is disconnected when the hand is released.
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.
How four-pin key switches work
The working principle of this switch is actually similar to that of an ordinary button switch. It is composed of a normally open contact and a normally closed contact. When the open contact is pressed, the circuit is turned on; when the pressure is removed, it returns to the original normally closed contact, which is the so-called disconnection. This pressing force is the action of using our hands to turn the button on and off. All in all, the working principle of the four-foot key switch is still well understood.
Four foot key switch application range
The application scope of the four-foot key switch is in household appliances such as electric fans, microwave ovens, TV sets, electronic fat scales, rice cookers and electronic kitchen scales; monitors, video interphones, etc. in security products; voice recorders in computers , cameras, etc.; call systems in medical equipment, sphygmomanometers, thermometers, etc., massage chairs in fitness equipment, running machines, etc., in these fields, four-foot key switches are 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.
The tact switch is to press to connect the circuit, the circuit is still connected after the hand is released, and the circuit is disconnected by pressing it again; the key switch is to press to connect the circuit, and the circuit is disconnected when the hand is released.
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.
How four-pin key switches work
The working principle of this switch is actually similar to that of an ordinary button switch. It is composed of a normally open contact and a normally closed contact. When the open contact is pressed, the circuit is turned on; when the pressure is removed, it returns to the original normally closed contact, which is the so-called disconnection. This pressing force is the action of using our hands to turn the button on and off. All in all, the working principle of the four-foot key switch is still well understood.
Four foot key switch application range
The application scope of the four-foot key switch is in household appliances such as electric fans, microwave ovens, TV sets, electronic fat scales, rice cookers and electronic kitchen scales; monitors, video interphones, etc. in security products; voice recorders in computers , cameras, etc.; call systems in medical equipment, sphygmomanometers, thermometers, etc., massage chairs in fitness equipment, running machines, etc., in these fields, four-foot key switches are 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.
