Trimmer (electronics)

They are common in precision circuitry like A/V components, and may need to be adjusted when the equipment is serviced.

Unlike many other variable controls, trimmers are mounted directly on circuit boards, turned with a small screwdriver and rated for many fewer adjustments over their lifetime.

For example, multi-turn trim potentiometers exist, in which it takes several turns of the adjustment screw to reach the end value.

[1] The position on the component of the adjustment often needs to be considered for accessibility after the circuit is assembled.

The other type is the multi-turn potentiometer which moves the slider along the resistive track via a gearing arrangement.

The gearing is such that multiple turns of the adjustment screw are required to move the slider the full distance along the resistive track, leading to very high precision of setting.

They can be tuned by squeezing the coils together or by pulling them apart as the inductance needs to be increased or decreased respectively.

The inductor and its resonant capacitor are commonly contained in a metal can for shielding with a hole at the top to give access to the adjustable core.

They are common in precision circuitry like A/V components, and may need to be adjusted when the equipment is serviced.

Unlike many other variable controls, trimmers are mounted directly on circuit boards, turned with a small screwdriver and rated for many fewer adjustments over their lifetime.