principle

14mm 16mm 18mm 20mm potentiometer come in many forms and have different structures.

I. Resistors of 14mm 16mm 18mm 20mm potentiometer

Resistor is a resistance component which provides a certain resistance value in potentiometer. Its electrical performance determines the main electrical performance of potentiometer. Resistors should have good resistance stability, smaller resistance temperature coefficient and static noise. In order to improve reliability, it should also have the properties of moisture resistance, heat resistance, wear resistance, oxidation resistance, high load resistance and cold and heat abrupt change resistance.

The resistor of contact potentiometer has a low resistivity because the moving contacts contact and slide on it, so that the contact resistance between the resistor and the moving contacts is small. At the same time, the surface resistivity should be evenly distributed to keep the change of contact resistance and track resistance in the effective electric stroke small, so that the ideal resistance characteristics can be obtained. The surface of the resistor body should have proper smoothness, hardness and wear resistance to ensure its mechanical durability. A pair-wound potentiometer is a kind of resistor wire wound around the skeleton to form a circular or spiral resistor. For a thin film or thick film potentiometer, a resistor film is formed on a public substrate, mostly in the shape of horseshoe, arc or long strip. For synthetic solid core potentiometers, horseshoe or strip resistance rails are pressed on the base.

2. The skeleton and matrix of 14mm 16mm 18mm 20mm potentiometer

The skeleton is the insulating support of the resistor of the wire wound potentiometer. The matrix (or substrate) is the support of the resistor of the non-linear wound potentiometer.

The skeleton and matrix are usually made of good insulating materials, which require good heat resistance, moisture resistance, electrical insulation, chemical stability and thermal conductivity, and only a certain mechanical strength. Generally there are laminated paperboard, laminated sheet, plastics, ceramics, glass and copper, aluminium and aluminium alloy with insulated surface. The metal matrix with insulated surface should have sufficient surface insulation. The matrix has good heat dissipation and is easy to form.