说明：  本系统是基于AT89S52单片机的数字式低频信号发生器。采用AT89S52 单片机作为控制核心，外围采用数字/模拟转换电路（DAC0832）、稳压电路（MC1403）、运放电路（LM324）、按键和LED显示灯电路等。
(The system is based on the AT89S52 microcontroller digital low frequency signal generator. AT89S52 microcontroller core used as a control, external digital/analog converter (DAC0832), voltage regulator circuit (MC1403), operational amplifiers (LM324), buttons and LED indicator light circuit.)