cross polarised 4g omni lte antenna.Classification and corresponding characteristics of sensitive potentiometer sensors

　　Variable resistor is also called adjustable resistor, and its text symbol is represented by the letter "R" or "RH". The variable resistor is usually a sensitive potentiometer sensor used in the circuit that needs to be adjusted frequently (that is, the resistance value does not need to change frequently) to adjust the voltage, adjust the current or signal control.

　　Variable resistor according to the production material can be divided into film type variable resistor and wire wound type variable resistor,

　　Use a small font screw screwdriver to rotate the adjustment part, change the classification of the movable contact sensitive potentiometer sensor and the resistance body, and the contact position can change the resistance value between the center tap and the two fixed pins.

　　Film type variable resistor sensitive potentiometer sensor and wire-wound variable resistor have the following characteristics:

　　1, film type variable resistor adopts rotary adjustment mode, classification, characteristics are generally used in small signal circuits, adjust bias voltage or bias current, signal voltage and so on.

　　2, the wire-wound variable resistor belongs to the power type resistor, with low noise, high temperature resistance, carrying current and other advantages, mainly used for various low-frequency circuit voltage or current adjustment.

　　High-power wire-wound variable resistor is also known as slip-wire type rheostat, which is divided into axial porcelain tubular wire-wound variable resistor and porcelain disc wire-wound variable resistor. Small power wire-wound variable resistors have circular vertical wire-wound variable resistors, circular classification, characteristics of horizontal wire-wound sensitive potentiometer sensor variable resistors and square wire-wound variable resistors, etc., are fully sealed packaging structure.

　　Film type variable resistor classification, usually by the resistance body (synthetic carbon film), movable contact plate (movable metal reed or carbon contact), adjusting parts and three pins (or solder). Two of the fixed pins are connected to both ends of the resistor body, and the other pin (center tap) is connected to the movable contact plate.

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