Abstract: A power supply device for a gas filled arc-type lamp having a transformer with a core with a primary coil and a secondary coil, a power source coupled to the primary coil of the transformer core and providing a generally sinusoidal signal, a connector for joining the secondary coil of the transformer to the gas-filled arch-type lamp, and an unbalanced capacitance for introducing even-order harmonic distortion on the generally sinusoidal signal on the primary coil of the transformer and generating a generally sinusoidal signal on the secondary coil of the transformer such that a flow of ionized gas is created within the gas-filled arch-type lamp for dispersing any bubbles and standing waves in the lamp and so as to avoid adjustment of the power supply. The distorted signal has one-half cycle longer with a lower peak voltage than the other half-cycle.

Abstract: An automotive ignition system transformer including a ferromagnetic core, a primary coil and a secondary coil. The secondary windings are wrapped on a tubular insulating winding form or bobbin with annular radial portions defining a plurality of annular coil chambers including a plurality of central chambers and at least one end chamber. The end chamber defines a spiral land that proceeds both axially toward the respective end and radially outward for three or more complete turns. The respective end turns of the coil are wrapped one turn of coil on each turn of the spiral land so that successive turns of the end portions of the secondary coil are both axially and radially spaced from one another sufficiently to minimize arcing.