This subject introduces a kind of nc dc voltage stabilizer, the power supply, by simulation showed circuit, control circuit and digital-to-analog circuit, amplifying circuit four parts, mainly is a set of singlechip intelligent dc power supply. Accurate analog power is to provide power, digital chip, amplifiers, microcontroller is the voltage required by A/D sampling data output voltage, and comparison, if there is A deviation is the limit, adjust output signal output and closure, alarm, The working process of the working status, manostat by SCM outputs drive LED display, Display circuit used to display the size of the output voltage of power. While the digital technology and the simulation analysis of the concept of technical topic is a kind of based on singlechip intelligent high-precision dc power supply of simple design, this power can use digital adjustment, the closed-loop real-time monitoring, high precision, and the output of both double overload protection and alarm functions, applicable to all have high accuracy requirements of the situation. It compared with traditional manostat with easy operation, high stability of power and its output voltage size using digital display characteristics.