Abstract: An electrical adapter is composed of a body and a changeable plug. The body has a housing being composed of a first semi-housing having a first notch and a second semi-housing having a second notch. A circuit plate is received in the housing and has a third notch and two strips respectively provided at a top and a bottom of the third notch. A first plug is rotatably mounted in the first notch and the second notch, and has a seat, two rods vertically extending through a top and a bottom of the seat respectively and electrically connected with the strips respectively, and two first blades horizontally inserted in the seat and respectively and electrically connected with the rods. The changeable plug has a connector with two passages for respectively receiving the first blades, and a second plug with at least two second blades perpendicular to the passages.

Abstract: This invention discloses an improved ring-core transformer which includes a ring core, a pair of coil former, a frame body, a pair of protrusions, at least one row of pin bases, a plurality of connecting pins and coils, wherein the coils are respectively wound on the pair of coil former. Each coil has a plurality of output terminals leading therefrom and is connected to the pins by being passed through the gaps between the pin bases and fixed in the slots formed on the pin bases. Therefore, the ring core transformer of this invention can offer excellent insulation by the isolation of the terminals also provide a wide range of output voltage.