Apart from adapter, you may also neef a suitable power supply. The commonly used power supply, with electronic circuits is the line operated power supply. In this the mains voltage is utilized in a transformer or directly, to work a rectifier. The rectified output, will be filtered using a filter circuit, that eliminates the ripple content of the rectified output. The output of the power supply will be pulsating unidirectional current. http://www.shengjipower.com/ac-dc-adapter/65w-max-desktop-power-supply/