该电路是指由一个电源，这就是为什么没有变压器，整流器，或者过滤器供电电容的示意图。
The circuit was meant to be powered by a power supply, which is why there is no transformer, rectifier, or filter capacitors on the schematic.
整流器是通信电源系统中非常重要的角色。
Rectifier is the most important role in the telecom power system.
记住开关式电源的存在。那是同设立在几乎所有音频齿轮上的传统的变压器—整流器—过滤器设备完全不同的。
Remember the presence of the switching power supply, which works totally differently from the conventional transformer-rectifier-filter setup found in nearly all audio gear.
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