A semiconductor device and a fabrication method thereof are proposed. The drive circuit comprises a transistor and a voltage regulator. Supply of wine in the apparatus is controlled by a control button on the handle which opens an upstream solenoid valve. Thus, the adjustment of the tension of the transmitting belt and other maintenance are facilitated, the transmitting efficiency of the transmitting belt can be enhanced, and compactness of the auxiliary-driving system itself and improvement in mileage can be achieved.