Abstract: A coil is specified which has at least four electrical conductors, wherein the electrical conductors are wound around a common winding center. Each of the at least four electrical conductors is at a constant distance from the winding center of the coil over the entire length of the coil.

Abstract: A high-frequency swinging choke has at least two rod cores arranged next to one another in the longitudinal direction. The rod cores each have at least one winding. The windings are connected in series.

Abstract: A high-frequency swinging choke has at least two rod cores arranged next to one another in the longitudinal direction. The rod cores each have at least one winding. The windings are connected in series.

Abstract: A coil is specified which has at least four electrical conductors, wherein the electrical conductors are wound around a common winding center. Each of the at least four electrical conductors is at a constant distance from the winding center of the coil over the entire length of the coil.

Abstract: A rod-core transformer for use as a starting transformer in the cap of a high-pressure discharge lamp for a motor vehicle headlight. The rod-core transformer has at least two cores (2, 3) which are in the form of rods and are arranged alongside one another, and on each of which a multilayer secondary winding (4, 5) is wound, with the respective layers (4a, 4b, 4c, 4d) and (5a, 5b, 5c, 5d) being connected in parallel and being arranged one above the other without any offset. Furthermore the secondary windings (4, 5) are electrically conductively connected to one another, with their total resistance being at most 2&OHgr;. The transformer is particularly highly suitable for use as a starting transformer for high-pressure discharge lamps with a low operating voltage, for example halogen metal-vapor high-pressure discharge lamps which do not contain mercury.

Abstract: The invention relates to a rod-core transformer for use as a starting transformer in the cap of a high-pressure discharge lamp for a motor vehicle headlight. According to the invention, the rod-core transformer has at least two cores (2, 3) which are in the form of rods and are arranged alongside one another, and on each of which a multilayer secondary winding (4, 5) is wound, with the respective layers (4a, 4b, 4c, 4d) and (5a, 5b, 5c, 5d) being connected in parallel and being arranged one above the other without any offset. Furthermore the secondary windings (4, 5) are electrically conductively connected to one another, with their total resistance being at most 2 &OHgr;. The transformer according to the invention is particularly highly suitable for use as a starting transformer for high-pressure discharge lamps with a low operating voltage, for example halogen metal-vapour high-pressure discharge lamps which do not contain mercury.