Introduction to Rotary Switch

Rotary Switch can be used to replace the rotary pulse generator of the traditional resistive potentiometer analog function. These Rotary Switches are usually used in the human-machine interface of the instrument front panel and the audio-visual control panel. The rotary switch uses an orthogonal optical encoder as a pure digital device to replace the analog potentiometer. These Rotary Switches are similar to traditional or resistive potentiometers in appearance, but the internal structure of these Rotary Switches is completely digital and uses optical technology. Similar to traditional incremental encoder products, there are two orthogonal output signals (channel A and channel B), which can be directly connected to the encoder processing chip.

Structural features:

Common band switches and multimeter shift switches are all Rotary Switches. There are two structures: one is the BBM (Break Before Make) contact type, which is characterized by the fact that when the moving contact is transposed, the front contact is first disconnected and then the rear contact is connected, and there is a state of disconnection with both the front and rear contacts; the other is the MBB (Make Before Break) contact type, which is characterized by the fact that when the moving contact is transposed, there is a state of contact with both the front and rear contacts. Then the front contact is disconnected and the contact with the rear contact is maintained. In circuit design, the appropriate rotary switch should be selected based on circuit purpose and circuit safety.