A general-purpose board-mountable preset is also known as potentiometers, trimpots, and other names, but it is essentially simply a variable resistor. Trimmer/Trimpots is a high-accuracy variable resistor with three terminal pins that can be mounted on a PCB. As the trimpot is rotated, the voltage between the terminals changes. It is used to change different parameters in an electronic circuit, such as voltage, current, and so on. The outer two pins are attached to Vcc and 0V, respectively, while the centre pin outputs a variable voltage between 0v and Vcc as the rotary cermet rotates. The potentiometer is simple to install on a PCB and adjust with a screwdriver. 

Specification