This paper designs a kind of digital control DC voltage source constituted by SCM control system. Taking STC89S52 as the central control module, the whole power system is constituted by A/D switching circuit, D/A switching circuit, amplification circuit, keyboard-display circuit. This system has many characteristics, such as high control precision, high reliability, low cost, easy use and implementation, and so on.%本文设计了一种由单片机控制系统构成的数控式直流电压源。以STC89S52作为控制核心，采用A/D转换电路、D/A转换电路、放大电路、键盘显示电路等构成整个电源系统。该系统具有控制精度高、可靠性高、成本低、使用方便、易于实现等特点。
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