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Nowadays, with the continuous improvement of people's living standards, many high-tech electronic products have slowly entered our daily life. Many of these products have adopted the technology of knob switch, so what is a knob switch? How does this switch work?

Now, let's talk about the specific application of this convenient switch. For most housewives, they are exposed to microwave ovens and other electrical products every day, and most microwave ovens use this switch design technology. The knob switch can more easily control the opening and closing of electrical appliances, and can play a good role in ensuring safety. It is worth mentioning that the switch design scheme of this knob, compared with the button switch, gives people a more comfortable feeling. Users can gently move the knob to achieve the purpose of switching.

1. Operating principle of knob switch:

Within a certain range, the resistance value is changed, and then there is a contact switch, which is the switch of old TV and radio. In the case of fan, there are several gears, which are connected to several groups of outgoing lines of fan winding, and the speed is changed by changing the number of coils. The principle is similar to that of a potentiometer, which is usually composed of a resistor and a movable brush.

When the brush moves along the resistance body, the resistance value or voltage that is related to the displacement is obtained at the output end.

1. Circuit diagram of knob switch:

The rotary switch is a switch that controls the on-off of the main contact point by rotating the handle. There are also two types of rotary switches, namely, single pole unit structure and multi pole multi position structure. Single pole unit rotary switches are often used with rotary shaft potentiometers in applications, while multi pole multi position rotary switches are mostly used for switching circuits in working states.

The common band switch and the shift switch of the multimeter are rotary switches, which have two types of structures: one is the BBM contact type, which is characterized in that the moving contact first disconnects the front contact and then connects the rear contact during the shift, and there is a state of disconnection with both the front and rear contacts.

The other is MBB contact type, which is characterized in that the moving contact has a state of contact with both front and rear contacts during transposition, and then disconnect the front contact to maintain contact with the rear contact. In the circuit design, the appropriate rotary switch shall be selected according to the circuit purpose and circuit safety.

Due to its purpose, the rotary switch adopts a sealed structure as a whole, which has a certain waterproof effect and can basically reach the waterproof level of IP65. At the same time, relatively hard and durable metal materials shall be used. There is a difference between gear 2 and gear 3.

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