What should I do if the potentiometer has large sliding noise?

The potentiometer often emits noise during operation. Is it due to improper operation or other reasons?

In fact, the sliding noise is a potentiometer-specific noise. When changing the resistance value, due to improper distribution of potentiometer resistance, improper coordination of the rotating system, and contact resistance of the potentiometer, etc., the moving contact will move along the surface of the resistor and the output will be accompanied by useful signals. The signal is fluctuating noise. The potentiometer is a resistor element having three terminals and the resistance can be adjusted according to a certain change rule. Potentiometers usually consist of a resistor body and a movable brush. When the brush moves along the resistor body, a resistance value or a voltage that is in a certain relationship with the displacement amount is obtained at the output end. The potentiometer can be used both as a three-terminal device and as a two-terminal device. The latter can be regarded as a variable resistor, because its role in the circuit is to obtain a certain relationship with the input voltage (applied voltage) to obtain the output voltage, so it is called a potentiometer.

For the wirewound potentiometer, in addition to the above-mentioned contact noise between the moving contact and the winding, there are also resolution noise and short-circuit noise. The resolving noise is caused by the step change of the resistance, and the short-circuit noise is generated when the moving contact moves on the winding and short-circuits the adjacent turns, and it flows with the current flowing through the winding. The resistance and the contact resistance between the moving contact and the winding are proportional to each other.