In the practical liquid level control system, it may become chaotic because of the nonlinear part in the proportion feedback circuit.

液位控制系统中的比例反馈回路中存在非线性环节，使液位控制系统的运动成为混沌运动。

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System hardware circuit audio digital signal source achieve this functions: sound signals, sound intensity level control, data communications, liquid crystal display, alarm and power.

系统硬件电路包括音频数字信号源实现声音信号产生、数字声强级控制、多机数据通信、液晶显示和电源等模块单元。

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