随着车电技术的不断发展,不少新型车电机具和设备已在客车上广泛使用。这些新型车电机具和设备的电压多是48伏,而老式L型发电机供电的却为24伏,这种车电装置虽已停止生产,但尚未完全淘汰。目前生产的新式SK50—3型列车广播机,其供电电压为48伏。为了使SK50—3 With the continuous development of car electrical technology, many new car electrical equipment and equipment has been widely used in buses. The new car has a volt of 48 volts and equipment, compared with 24 volts for the older L-type generator, which has not yet been phased out, although it has stopped production. The current model SK50-3 train radio is currently available with 48 volts. In order to make SK50-3