The potentiometer is composed of a resistor and a rotating or sliding system. It has three leading terminals and resistor elements whose resistance value can be adjusted according to certain changing rules. So, how to choose the appropriate potentiometer? It's a headache for many friends. As a bourns trimmer potentiometer manufacturer, thinks that it's better to refer to the following three factors.

1. Reasonable selection of electrical parameters of potentiometers
After choosing the type and specification of bourns trimmer potentiometer according to the requirements of equipment and circuit, the electrical parameters of potentiometer should be reasonably selected according to the requirements of circuit, including rated power, nominal resistance, allowable deviation, resolution, maximum operating voltage, dynamic noise, etc.

2. Choosing trimmer potentiometer according to the law of resistance change
Linear potentiometers should be used for voltage regulation, operation point regulation of amplifier circuit, secondary brightness regulation and line and field scanning signal regulation in various power supply circuits. The reversed logarithmic potentiometer (exponential potentiometer) and logarithmic potentiometer should be used in the sound control of audio equipment.

3. Choose potentiometer according to the requirement of use
When choosing trimmer potentiometer, the resistor material, structure, type, specification and regulation mode of potentiometer should be selected according to the specific requirements of application circuit. For example, high-power circuit uses power-type wire-wound potentiometer; high-precision wire-wound potentiometer, precision multi-circle potentiometer or metal glass glaze potentiometer should be selected in precision instrument circuit; carbon film potentiometer can be used in medium and high frequency circuit; volume regulation and power switch of semiconductor radio can be selected with small rotary switch. Carbon film potentiometer; volume control of stereo audio amplifier can choose double and axis potentiometer; audio control system can choose straight sliding potentiometer; reference voltage regulation of power circuit should choose fine-tuning potentiometer; potentiometer used in communication equipment and computer can choose patch multi-loop potentiometer or single-loop potentiometer. Locator.

What are the main characteristics of potentiometers?

1. The parameters and characteristics of potentiometers. The main characteristics of trimmer potentiometer are output function characteristics, coincidence, resolution and sliding noise. The nominal resistance, allowable deviation, rated power and resistance temperature coefficient of potentiometer are the same as those of resistor. The indicators of potentiometer include wear resistance life and starting moment.
2. Potentiometer output function characteristics. The functional relationship between the voltage ratio of potentiometer (the ratio of output voltage to input voltage) and the stroke ratio (the ratio of brush to total stroke) is also called the law of resistance variation. There are three commonly used functional relationships: linear, exponential and logarithmic. In addition, there are sine, cosine and other forms suitable for special purposes.
3. Potentiometer conformity. The degree of deviation between the actual output function characteristics of bourns trimmer potentiometer and the theoretical value is expressed by the percentage of absolute difference between the actual output and the theoretical transmission. For linear potentiometers, the conformity is expressed by linearity, and its allowable deviation range is called linear accuracy.
4. Potentiometer resolution. The finest adjusting ability of the potentiometer to the output voltage or resistance represents the output change that can be produced by the smallest movement of the brush. It has an important influence on the adjustment accuracy of instrument or control system.
5. Sliding noise of potentiometer. The irregular parasitic potential caused by the brush moving on the resistor (assuming there is no thermal noise and current noise), the sliding noise of the non-wire wound potentiometer is expressed by dynamic noise or smoothness, and the sliding noise of the wire wound potentiometer is expressed by the equivalent noise resistance.