# Variation characteristics of potentiometer resistance

Variation characteristics of potentiometer resistance The characteristic of resistance change refers to the relationship between the resistance of the potentiometer and the length of the movable contact or the angle of rotation of the rotating shaft, that is, the characteristic of the resistance output function. There are three commonly used resistance change characteristics. Straight line type (X type): With the change of the moving corner position, its resistance value changes close to a straight line. Exponential formula (Z type): The change of the potentiometer resistance has an exponential relationship with the change of the dynamic angle position. The resistance change of the linear potentiometer has a linear relationship with the rotation angle. When the conductive material on the resistor is evenly distributed, the resistance per unit length is approximately equal. It is suitable for occasions requiring uniform adjustment (such as voltage divider). In the exponential potentiometer, due to the uneven distribution of conductive substances on the resistor body, when the potentiometer starts to rotate, the resistance value changes slowly, and when the rotation angle increases, the resistance value changes steeply. The permissible power per unit area of ??the exponential potentiometer is unequal, and the end with a small resistance change is allowed to withstand a larger power. It is commonly used in volume adjustment circuits because the human ear is most sensitive to the loudness of the sound. When the volume reaches a certain level, the hearing of the human ear gradually becomes dull. Therefore, the volume adjustment generally uses an exponential potentiometer, so that the sound changes seem stable and comfortable. In the logarithmic potentiometer, due to the uneven distribution of the conductive material on the resistor, the resistance changes rapidly when the potentiometer starts to rotate. When the rotation angle increases, the resistance changes when it approaches the end with the larger resistance Relatively slow. Logarithmic potentiometers are suitable for electronic circuits that are contrary to the requirements of exponential potentiometers, such as contrast control circuits and tone control circuits for televisions. Looking for deals? digital potentiometer programmable from Heisener is the right answer. Request a real-time quote on our web and choose from different manifacturers. related articles： What types of potentiometer What are the main parameters of the potentiometer test Main parameters rated power potentiometer function and potentiometer connection principle of current controller