Abstract: A method of assembling a coil includes forming a ferrite core having a top end, a bottom end, an inner opening extending from the top end to the bottom end, a cylindrical outer surface, and a step portion formed near the bottom end, the step portion extending past the outer surface. A first high dielectric material is applied on the outer surface of the ferrite core, then a conductive wire is wound onto the high dielectric material, whereafter a second high dielectric material is applied over the conductive wire.

Abstract: A coil assembly includes a cylindrical ferrite core having a top end, a bottom end, an inner opening extending from the top and to the bottom end, a cylindrical outer surface, and a stepped portion formed at the bottom end, where the stepped portion extends past the outer surface of the cylindrical core. A first high dielectric material is located over at least a substantial portion of the surface of the cylindrical core by use of a coating process. A length of conductive wire is wound around the first high dielectric material located over the outer surface of the cylindrical ferrite core. The winding of the wire around the core forms a coil having a first end and a second end. A second high dielectric material is then located over the coil, not including the first end and second ends. A coil holder is formed including a base portion having a base opening formed substantially at a centered area of the coiled holder.

Abstract: This invention relates to a single-ended discharge lamp having an electric circuitry placed in its base member, which discharge lamp comprises a discharge tube filled with additive and gas, is sealed in a gas-tight manner and is provided with electrodes. A base member is provided for the mounting of the discharge tube and for incorporating the electric circuitry mounted on a printed circuit board therein. The base member has a screw base mounted thereon both for mechanical and electrical connection to a socket. Furthermore, the terminals of the circuitry are fixed and are electrically connected with the electrode lead wires by means of mechanical connector arrangement where the mechanical connector component is one contiguous metal part.

Abstract: A gas discharge lamp ballast with an indicator of operability of the ballast is disclosed. The ballast circuit comprises circuitry for providing a d.c. bus voltage on a bus conductor with respect to a ground, and a resonant load circuit. The resonant load circuit includes lamp terminals for connecting to a removable gas discharge lamp, a resonant inductor, and a resonant capacitor. The resonant inductor and resonant capacitor are selected to set a magnitude, and resonant frequency, of a bidirectional current in the lamp. Further included is a converter circuitry, including first and second serially connected switches coupled between the bus conductor and the ground, and providing to the resonant load circuit, at a node coupled between the first and second switches, a voltage that alternates between first and second voltage levels.