Abstract: An adaptor to drive DC powered light emitting device from an AC power source includes a main body having a first coupler configured to be connected to an external AC socket, a printed circuit board (PCB) disposed in the main body, an auxiliary body having a second coupler configured to be connected to the DC powered light emitting device, and a flexible, adjustable length connector extending outwardly from the main body between the PCB and the second coupler.

Abstract: The electric supercharger includes a vehicle connector, an impulse signal generator empowered by a power source, and a signal amplifier. The vehicle connector has a positive terminal and a negative terminal for electrically connecting to an electrical source of said vehicle. The impulse signal generator, which is electrically linked to the vehicle connector for receiving an impulse signal from the electrical source of the vehicle, includes a signal integral circuit stably generating a rectangular impulse signal. The signal amplifier electrically connects to the impulse signal generator to amplify the rectangular impulse signal and to send the amplified rectangular impulse signal back to sparkplugs and injectors of the vehicle through the vehicle connector for enhancing a combustion-efficiency of an engine of the vehicle.

Abstract: A light emitting display unit includes an electroluminescent display device and a control unit supplying power to, and controlling light emission of, the electroluminescent display device. The control unit includes a controller, a power supply, and conductor. The electroluminescent display device and the control unit may be formed as single, integrated unit, or they may be detachably coupled with each other.