Summary

This article discusses the structural classifications, applications, and usage characteristics of switch potentiometers.

Types of Switch Potentiometers

Switch potentiometers are commonly categorized into two types based on their structure: rotary switch potentiometers and push switch potentiometers.

1. Rotary Switch Potentiometers: Rotary switch potentiometers feature an ON/OFF mechanism installed at the end of the potentiometer. This mechanism turns the potentiometer into a five-terminal device.
2. Push Switch Potentiometers: Push switch potentiometers have a metal dome installed at the end of the potentiometer. When pressure is applied to the metal dome, it creates a spring-back effect, forming the push switch function. This also provides tactile feedback to the user.

Advantages and Disadvantages

Each type of switch potentiometer has its pros and cons. Rotary switch potentiometers can handle higher switch currents compared to push switch potentiometers. However, the lifespan of rotary switch potentiometers is shorter than that of push switch potentiometers.

Applications of Switch Potentiometers

Switch potentiometers generally serve three main functions:

1. Voltage DividerA potentiometer functions as a continuously adjustable resistor. When adjusting the potentiometer's knob or slider, the wiper moves along the resistive element, providing an output voltage that is proportional to the applied voltage and the wiper's position.
2. Variable Resistor (Rheostat)When used as a variable resistor, the potentiometer should be connected as a two-terminal device. This allows for a smooth, continuous change in resistance across the potentiometer's range of motion.
3. Current ControllerWhen functioning as a current controller, one of the selected current output terminals must be the wiper. This allows the potentiometer to control the current based on the variable resistance.