Electromechanical switches, such as tacts and pushbuttons, produce tactile and audible feedback through their internal mechanical design. They’ll commonly provide a physical sensation, described as a “click” or “bump,” and an audible sound when pressed. A switch’s overall click feel is determined by its click ratio, travel and sound.
Tactile Switch Click Sound and Feel
The physical feedback you feel is achieved through a mechanism inside the switch that includes a metal dome or similar structure. When you press the switch the dome collapses, completing the circuit and providing a tactile response. Once the pressure is released, the dome returns to its original shape, breaking the circuit. The amount of force required to actuate the switch, known as the operating force, varies. Switches designed with lower operating forces tend to be quieter and softer.
The audible feedback, typically a “click” sound, is produced by the same mechanical action that provides tactile feedback. When the metal dome or internal mechanism snaps into place, it creates a sound that indicates the switch has been activated.
Selecting Switch Click Sound
Click sound should be considered when selecting a switch for an application. You can control sound varieties by selecting various travel and push force options. Several factors influence how quiet or soft the feedback from an electromechanical switch is.
The material and design of the metal dome or internal mechanism plays a significant role. Softer materials or designs that minimize the force required to actuate the switch can reduce noise and provide a gentler tactile response.
If you select a switch with a lower click ratio or lower push force, the switch will have a lower click sound. Quiet and soft tactile switches are particularly important in noise-sensitive environments such as medical devices, automotive interiors and consumer electronics.
The amount of force required to actuate the switch, known as the operating force, varies. Switches designed with higher operating forces tend to be louder and more rigid. The distance the switch travels when pressed, known as the travel distance, also affects feedback. Shorter travel distances can result in a softer and quieter response.
Finally, some switches incorporate damping materials to absorb sound and reduce noise during operation. Applying lubrication to the switch components can reduce friction and noise, resulting in quieter operation.