When we use low-dropout switching power switching converter to reduce positiveinput voltage, we usually need an extra low - power negativeoutput voltage.
在采用降压开关功率开关转换器降低正输入电压的同时，通常还需要一个额外的低功率负输出电压。
2
Before connecting this unit, please make sure that the input and output terminal, and the positive and negative polarities of output terminal are on the right position respectively.
使用时请注意区分输入端与输出端，以及输出端的正负极性，核对无误后才能通电；
3
The input ends of positive phase and negative phase of the first time-delay unit are respectively connected with the output ends of positive phase and negative phase of the last time-delay unit.