The operating principle of its PWM circuit, current display circuit and sequence timer circuit etc. are described.
论述了PWM电路、电流显示电路、程序时间调节控制电路等的工作原理。
By an analysis of the circuit operating conditions, an important formula for its proper design is derived and ways to improve efficiency are proposed.
通过对这种电路的工作状态进行分析，提出了正确设计的重要公式和提高效率的方法。
The design concept of communication circuit is described in detail, and the operating principle of three different types of communication circuit is discussed.
文章详细地阐述了通讯电路的设计思想，并讨论了三种不同类型的通讯电路的工作原理。
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