本设计是关于方波发生器和音调识别器的设计，以NE567音调解码器为基础器件，配上其它适当的零部件，在试验箱上进行电路的设计连接。本文详细介绍了LM567的内部结构、工作原理、性能指标和选择参数以及用其所设计的频率调制器（方波发生器）和音频信号识别器（音调控制开关）。-The design is on the square-wave generator and a tone recognizer designed to NE567 tone decoder-based devices, with other appropriate components, in the chamber on the design of circuit connections. This paper introduces the LM567 s internal structure, working principle, performance indicators and selection of parameters and the frequency with which it was designed modulator (square-wave generator) and the audio signal identifier (tone control switch).