Trimmer Resistor ‐ is a resistor designed to adjust during product setup. During operation, the resistance of the tuning resistor does not change, so the design of the tuning resistor It is usually intended for installation using a screwdriver or a special key and does not imply the removal of the settings on the panel. The main parameters of the resistor are almost the same as the variable resistor. The main parameters are rated resistance, tolerance, permissible power dissipation. Trimmer resistors in bulk have one channel.