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.
用变压器和整流器相配合直接得到很高的电压是困难的。
It is difficult to produce a very high voltage directly, by a combination of transformer and rectifier.
大多数情况下直流电是从交流电通过变压器和整流器而来的。
In most cases it is derived from the AC mains by means of a transformer and rectifier.
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