Aircraft dimming resistors and knobs have been designed to control the level of illumination in aircraft instrument panels and similar applications where low voltage incandescent lamps are used in multi-lamp and multi-circuit configurations

Typically up to 50 midget panel lamps can be controlled from "off" to maximum light output by one composite unit.

Units are assembled from a range of modular high dissipation variable resistance elements mounted on a common shaft which has a rotation range of about 100°. Separate switch modules can also be incorporated into the assembly.

By the choice of appropriate resistor values and the use of inter-module linking, assemblies can easily be configured to meet most circuit requirements from a range of standard components.

Assemblies are designed for panel mounting and a range of suitable control knobs are stocked for aircraft or other use.

Concentric Spindle Dimming Resistors.

The concentric spindle assembly provides two spearate dimming circuits, individually controlled from a common axis. Two control knobs operate the unit, with the front knob operating the rear section from the inner spindle, and the rear knob operating the front section from the outer spindle.

Finger Knobs.

A wide range of finger knobs for the above units, styled for aircraft use, are available.