Abstract: In a method for winding a toroidal coil, a winding of a first layer is made by means of repeating the following three steps. At a first step, one end of a wire is inserted into a central aperture of a core from one side thereof to extend the wire along an axial direction of the core; the other end of the wire is abutted to one surface of the core such that the other end is radially extended; and a tension is applied to the wire and the core with the other end of the wire is then turned in a diametrical direction of the core perpendicular to the radial direction. At a second step, the one end of the wire is inserted into the central aperture of the core towards the other side; and the tension is applied to the wire and the core is then rotated at a desired angle in one direction on a central axis of the core.

Abstract: A power supply circuit for automotive headlamps includes an electrical wire establishing communication between one of the headlamps and a power source at a first position of a combination switch, and a control unit selectively establishing communication between the other headlamp and the power source at the first position and between both of the headlamps and the power source in series at a second position of the combination switch.