我们工区负责检修的三台BDH—Ⅱ型会议分机,由于交直流不能自动转换和使用交流时有交流电源的干扰,所以一直使用电池。为节约开支,充分发挥设备潜力,最近,我们对会议分机供电部分做了一点改动,实现了交直流自动转换,消除了受信的交流声,节省了电 The three BDH-Ⅱ conference extensions responsible for the overhaul in our work area have been using batteries because they can not be automatically converted and used by AC power sources. In order to save money and give full play to the potential of the equipment, we recently made some changes to the conference extension power supply to realize the automatic conversion between AC and DC, eliminating the need for trusted exchange of voices and saving electricity