An adapter is a device in the form of an electronic circuit to convert a large electrical voltage into a smaller electrical voltage, or a circuit to convert alternating current (AC current) into direct current (DC current).
This DC voltage is needed by various kinds of electronic circuits to be operated. As with the adapter / power supply used in acrylic lamp decorations. The core circuit of the adapter / power supply is a rectifier circuit that is a circuit that converts an alternating signal (AC) into a direct signal (DC).