Abstract: A low component count and lightweight ballast usable with fluorescent lamp loads of widely different wattage has first and second inductors and first and second capacitors connected in a bridge circuit and can provide current regulation within a few percent for lamp loads between 14 Watt and at least 40 Watt. The two inductors can be wound on a single toroidal core for maximum compactness.

Abstract: A fluid control valve unit particularly suited to be used as an air control valve in an overhead passenger service unit for aircraft, buses, trains and the like. This valve unit includes a non-rotatable and axially movable closure member which moves in response to rotation of an axially non-movable actuator member supported in a universally pivotable and tiltable housing. This valve has relatively few component parts and is thus easy to manufacture and assemble. A helical groove on the actuator member cooperates in a cam-like manner with a projection on the closure member to create the desired translation.

Abstract: A relatively high efficiency, relatively light weight, relatively small electronic ballast or AC power controller for use in aircraft and elsewhere for controlling a fluorescent lamp load or other load includes an EMI filter, a multi-purpose transformer, a power conversion stage and a control circuitry stage. The ballast or controller operates to increase or decrease the voltage of the incoming sine wave AC voltage through a charging path for an energy storage inductor choke cooperating with an energy storage capacitor wherein the charging path for the capacitor is different from the discharge path of the capacitor to isolate the load from the charging of the capacitor and thus to provide an output to the load which is independent of the charging path and which is out of phase with the incoming waveform.

Abstract: A ballast coil, transformer, and power factor capacitor are plug-in mounted on a PC-board which is mounted into a frame being covered to provide a complete, unpotted enclosure. The transformer and the coil are additionally fastened to the enclosure and the board, and additional heat dissipation is provided for. Several different examples are enclosed for toroidal and laminated core structures and different capacitor positions. The capacitor is retained additionally by a strap which is screwed to one or both of the inductive elements. Additional fastening and heat dissipation is combined in toroidal inductances, by using a central post traversing the board and screw, and being fastened to a cover wall.