This paper introduces the design of a programmable power supply.The system takes AT89C52 microcontroller as the core to realize the presetting voltage, step by step, adjusting the output voltage signal to digital display function, then it over-comes the shortcoming of the traditional regulated power supply .%本文设计了一种程控直流稳压电源系统，该系统以AT89C52单片机为核心实现了电压可预置、可步进增减调整、输出电压信号可数字显示等功能，弥补了传统稳压电源的不足。
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