There are many kinds of common potentiometer models, but the application range of adjustable potentiometer is also very extensive, so we should refer to certain standards when choosing. In the previous content of the article, we have made a corresponding analysis of the development prospect of the adjustable potentiometer. The following Xiaobian will briefly describe the main categories of the adjustable unit type, and the common ones are as follows:

 

   1, wound potentiometer

   The resistance body is made by wrapping the alloy resistance wire on the insulation framework, and the reeds of the center tap are sliding on the resistance wire. Wound potentiometer is very widely used, can be made into precision type, ordinary type and fine tuning type potentiometer, and the rated power to do relatively large, low noise resistance, small temperature coefficient, high temperature resistance.

 

  2, multi-turn potentiometer

 

   We all know that multi-turn potentiometer belongs to precision potentiometer. It has no pointer, with pointer and other forms, adjust the number of laps 5 laps, 10 laps and other kinds. The potentiometer has the same characteristics of the wound potentiometer, but also has excellent linearity, fine adjustment and other advantages, so it can be widely used in the implementation of precision adjustment of resistance occasions.

 

   3, organic solid core potentiometer

 

   The resistance body is prepared by conductive material, organic filler and thermosetting resin. After hot pressing, the solid core resistance body is formed on the base. So the potentiometer is characterized by small size, simple structure, high temperature resistance, long life, high reliability, widely used in welding on the circuit board for fine tuning use; Disadvantage is low pressure, noise.

 

   4, synthesis membrane potentiometer

 

   Smear a layer of synthetic carbon film on the insulating matrix, form a carbon film after heating and polymerization, and then combine with other parts. The resolution of this kind potentiometer is high, range of negative value is wide, negative value change is continuous, cost is low. But the adaptability to temperature and humidity is poor, short service life.