以单片机为核心控制器，结合D/A 转换、LCD1602 显示、程控放大器，设计输出频率、幅度可调的正弦波、方波 和三角波信号发生器，对系统主要硬件电路和软件进行设计。经实验测试，系统实现了各波产生、显示，信号频率、幅度可调等 功能，频率和幅度误差都是5%以内，波形质量较好。系统电路简单、体积小、成本低、精度较高、工作稳定和使用方便直观，具 有广泛的应用前景。

Main hardware and software of the system are designed, using microcontroller as the core controller, and combining with D/A conversion, LCD1602 display, programmable amplifier designed output frequency, amplitude adjustable sine, square and triangular wave signal generator. The experiment shows that the system implements wave generation, display, and adjustment of signal frequency and amplitude. The frequency and amplitude errors are less than 5%, and wave quality is good. This system has the advantages of simple circuit, small size, low cost, high precision, stable work and easy usage, having a wide range of application.