说明：  本设计是以STC89C52单片机为核心来设计的信号发生器。主要由单片机控制模块、D/A0832转换模块、运放模块、键盘模块，串口下载模块构成。信号发生器通过硬件电路和软件程序相结合，可输出自定义波形。
(The design is based on the signal generator the STC89C52 microcontroller as the core design. Controlled by single chip module, the D/A conversion module, the op-amp module, keyboard module, serial download modules. The signal generator through a combination of hardware circuitry and software programs can output custom waveform.)