There is a big difference between the adjustable resistor and the general appearance. The adjustable resistor has some unique characteristics, and the adjustable resistor can be easily identified in the circuit board.
First: Adjustable resistors can be divided into carbon film adjustable resistors and ceramic adjustable resistors.
Second: There will be an adjustment rotating port on the adjustable resistor, and the moving piece can be changed with a screwdriver to adjust the resistance.
Third: The adjustable resistance is larger than the ordinary resistance, and there are fewer variable resistances in the circuit, and it is easy to find the adjustable resistance in the circuit board.
Fourth: The adjustable resistor has three pins, and these three pins are different, one of which is the moving film pin, and the other two are the fixed film pins. Two fixed film pins are generally interchangeable, but the moving film pins and fixed film pins cannot be used interchangeably.
Fifth: The resistance value marked on the adjustable resistor can be seen. The resistance value is the resistance value between the two stator pins, that is, the maximum value between the stator pin and the movable film pin.
Sixth: The variable resistor with a small plastic case has a smaller volume and a circular structure. Its three pins are downward and the resistance adjustment port faces upward. Some variable resistors used in high power occasions are very large, and the moving piece can slide left and right to adjust the resistance value.
Seventh: Vertical adjustable resistors are mainly used in small-scale circuits. The pins are downward and mounted on the circuit board vertically. The resistance adjustment is in the horizontal direction. The pins of the horizontal adjustable resistor and the resistance plane are 90 degrees. Vertically downward, lying flat on the circuit board, with the adjusting opening facing upward.