A converter includes a connecting block and multiple conversion modules corresponsive to each positioning slot. The connecting block has multiple positioning slots. Each conversion module includes a printed circuit board, and a positioning notched edge formed at an edge of the printed circuit board, and at least a portion of each printed circuit board is accommodated into the corresponsive positioning slot, and each positioning notched edge is latched and coupled to an edge of the corresponsive positioning slot, and each printed circuit board has a first connector and a second connector electrically connected to the first connector, and both of the first connector and the second connector are configured on both sides of the connecting block respectively.