A power supply device is disclosed that outputs a voltage of a wider range with a single piezoelectric transformer. this procedure involves providing a valved passageway through the patient’s left ventricular wall at the apex of the patient’s heart and advancing instruments through the valved passageway to connect the valve leaflets of the patient’s heart valve, e. The electronic cabinet assembly further includes a set of latch subassemblies which is configured to selectively interconnect the first and second electronic cabinet frames, and disconnect the first and second electronic cabinet frames from each other. This exchange of presence statuses enables initiation of video calls between the video calling devices. Based on the above-said structure, the switch at the left or the right side of the roller construction module can be respectively activated, and another switch, at the middle area of the mobile device, can be prevented from being activated simultaneously so that error prevention is achieved. The ground reference terminals of the sets are disposed in a single row of terminals, while the differential signal terminals of the same terminal set are disposed in another row of terminals spaced apart from the row of ground reference terminals.