Abstract: An apparatus for preventing the radiation and conduction of electro-magnetic wave noises generated from the igniting device of a gasoline engine is disclosed. The igniting portion of a gasoline engine such as an igniting coil, a continuously contacting and opening contact breaker, a power distributor, and igniting plugs generate all kinds of electro-magnetic wave noises of wide frequency bands. These noises give adverse effects to the various components of an automobile or an air plane such as electric and electronic convenience devices, safety devices and engine controllers, resulting in malfunctions of the components. By shielding and absorbing such electro-magnetic wave noises, an automobile or an air plane is protected from possible accidents, and human lives are saved.

Abstract: A circuit for shielding an electro-magnetic wave noise radiated and conducted from a wiper motor is disclosed. The circuit absorbs, shields or suppresses such electro-magnetic wave noise when the wiper motor is activated to drive the wiper under a particular weather condition such as rain or snow. The different components of the electro-magnetic wave noise are absorbed or suppressed by different circuit components, so that the electro-magnetic noise could not reach safety devices of the automobile. Therefore accidents can be prevented, and riders can be protected.