说明：  波形发生器是一种常用的信号源，广泛地应用于电子电路、自动控制系统和教学实验等领域。本次课程设计使用的AT89S51 单片机构成的发生器可产生锯齿波、三角波、正弦波等多种波形，波形的周期可以用程序改变，并可根据需要选择单极性输出或双极性输出，具有线路简单、结构紧凑等优点。在本设计的基础上，加上按钮控制和LED显示器，则可通过按钮设定所需要的波形频率，并在LED上显示频率、幅值电压，波形可用示波器显示。
(Waveform generator is a common source, widely used in electronic circuits, automatic control system and the teaching experiments and other fields. The curriculum design using AT89S51 microcontroller can produce sawtooth wave form generator, triangle wave, sine wave and other wave, wave period can be program changes, and can be selected unipolar output, or bipolar output, with circuit is simple, compact structure. The basis of this design, coupled with the button control and LED display, the button can be set by the required frequency waveform, and LED display frequency, amplitude voltage waveform can be used oscilloscope display.)