Abstract: A conversion system includes a transformer, a rectifier element, a filter circuit, a voltage regulator circuit, and a divider circuit. The voltage regulator circuit includes a first option switch, a first regulator, and a second regulator. The transformer outputs an AC voltage, and the rectifier element converts the AC voltage to a pulsating DC voltage. The filter circuit converts the pulsating DC voltage to a ripple DC voltage. The divider circuit outputs a first DC voltage of a constant positive value when the first option switch connects to the first regulator, and the divider circuit connects to the first regulator to control value of the first DC voltage value. The divider circuit outputs a second DC voltage of a constant negative value when the first option switch connects the second regulator, and the divider circuit is connected to the second regulator to control value of the second DC voltage.

Abstract: A connector mounting apparatus includes a receiving bracket for receiving a connector, and a front panel. The receiving bracket includes two hooks and a positioning tab. The front panel includes a front panel body. The front panel body defines two securing holes and a positioning cutout. The two securing holes are engaged by the two hooks to prevent the receiving bracket from moving along a first direction. The front panel includes a resilient arm. The positioning tab is received in the positioning cutout. The resilient arm is adjacent to the positioning cutout to prevent the positioning tab from moving along a second direction. The resilient arm is pressed to enable the positioning tab to be moved out of the positioning cutout along the second direction. The two hooks disengage from the two securing holes when the two hooks move along the second direction.