One, the synthesis of carbon film potentiometer

The resistive body of synthetic carbon film potentiometer is composed of carbon film, graphite, quartz powder and organic powder mixture to form a suspension, which is coated on glass glazed fiberboard or adhesive paper.It is the most widely used potentiometer at present.Advantages of synthetic carbon film potentiometer: wide resistance range, high resolution, can be made of various types of potentiometer, long life, low price, many models.Disadvantages: power is not too high, high temperature resistance, poor moisture resistance, low resistance potentiometer is not easy to make.

Organic solid - core potentiometer

Organic solid core potentiometer is a new type of potentiometer, which USES the method of heating and molding to press the organic resistance powder into the groove of the insulator.Compared with carbon film potentiometer, organic solid core potentiometer has the advantages of good heat resistance, high power, high reliability and good wear resistance.But the temperature coefficient is big, the dynamic noise is big, the moisture-proof performance is bad, the manufacture craft is complex, the resistance value accuracy is bad.In miniaturization, high reliability, high wear resistance electronic equipment and ac, dc circuit used for regulating voltage, current.

Metal film potentiometer

Metal film potentiometer is made of metal composite film, metal oxide film, metal alloy film and oxidation button film, etc.Advantages: good heat resistance, high resolution, small distributed inductance and distributed capacitor, low noise electromotive force.Disadvantages: bad abrasion resistance, small resistance value range (10 Ω Ω - 100 k).

Wire wound potentiometer

The wire-wound potentiometer is made by winding a constant-copper wire or a nickel-chromium alloy wire around an insulating framework as a resistive body.Advantages of wound potentiometer: low contact resistance, high precision, low temperature coefficient.Disadvantages: poor resolution, low resistance, poor high-frequency characteristics.It is mainly used for voltage divider, transformer, instrument in zero adjustment and adjustment point.

Digital potentiometer

The digital potentiometer cancels the moving parts and is a semiconductor integrated circuit.Advantages: high adjustment accuracy, no noise, extremely long working life, no mechanical wear, data readable/written, with configuration registers and data registers, multi-level storage function, easy to control software, small size, easy to assemble.It is suitable for home theater systems, audio surround controls, audio amplifiers and cable TV equipment.