微调与变阻器

A trimmer is a potentiometer which needs infrequent adjustment and they are often used to calibrate a device or circuit after manufacturing and require a special tool for adjustment ; A rheostat is a two-terminal variable resistor which functions similarly to a potentiometer. A three-terminal potentiometer can be used as a rheostat with the third terminal left unconnected and are typically used as strict variable resistors.

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