A liquid crystal display includes an array pixel including a plurality of pixels arranged in a matrix. The apparatus includes a main body having a central opening for receiving an extension member attached to a slot plate. A moving picture experts group decoder discards the error symbol. An electric embodiment of the invention includes an electric motor, an electric generator, a device for storing electrical energy such as a battery pack or a capacitor bank, a DC tachometer driven by the motor and operative to sense the motor power requirements, and a directional circuit switch assembly. In some transmitters, feedback controllers and feedback loops are used to regulate output current, voltage or power.