Common classification of patch potentiometers

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　　1 Synthetic carbon film potentiometer

　　The resistor body is coated on the surface of the substrate with carbon black, graphite, quartz and other materials that are classified and ground by the patch potentiometer. The process is simple and it is the most widely used potentiometer at present. It is characterized by high resolution, good wear resistance and long life. The disadvantages are current noise, large nonlinear, poor moisture resistance and resistance stability.

　　2 Organic solid potentiometer

　　Organic solid potentiometer is a new type of potentiometer, which uses the method of heating plastic pressing to press organic resistance powder into the groove of the insulator. Compared with the carbon film potentiometer, the organic solid potentiometer has the advantages of good heat resistance, high power, high scalability, good wear resistance and classification. However, the temperature coefficient is large, the dynamic noise is large, the moisture resistance performance is poor, the manufacturing process is complex, and the precision of the resistance value is poor. It is used to regulate voltage and current in miniaturized, high performance and high wear resistance electronic equipment and AC and DC circuits.

　　3 Metallic glass uranium potentiometer

　　The metal glass uranium resistance paste is coated on ceramic matrix by screen printing method and sintered at high temperature. Characteristics are: wide range of resistance, good heat resistance, strong overload capacity, moisture resistance, wear resistance and so on are very good, is a very promising potentiometer varieties, the disadvantage is the contact resistance and current noise.

　　4 Wire wound potentiometer

　　Wire wound potentiometers are made by using Constantan wire or nichchromium wire as a resistance plate potentiometer, sorting it, and wrapping it around an insulating skeleton. The wound potentiometer is characterized by small contact resistance, high precision and small temperature coefficient, and its disadvantages are poor resolution, low resistance and poor high-frequency characteristics. It is mainly used as voltage divider, rheostat, zero adjustment and working point in instrument.

　　5 Metal film potentiometer

　　The resistance body of the metal film potentiometer can be composed of alloy film, metal oxide film, metal foil, etc. It is characterized by high resolution, high temperature resistance, low temperature coefficient, low dynamic noise and good smoothness.

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