说明：  数字直流稳压器： 用单片机来设置输出电压，把单片机设置的数值通过D\A数模转换变换为模拟电压，然后通过输出的模拟电压，控制稳压模块的输出，稳压模块由可调稳压块LM317和双运算放大器LM358构成，通过LM358比较输出和设置电压并控制LM317的输出，以达到比较精确的输出，用三位数码管动态显示输出电压值，精确到0.1V。
(Digital DC Regulators: MCU to set the output voltage, the single-chip set of values through the digital-analog converter DA transform analog voltage, and then through the analog output voltage, the control module s output voltage regulator, voltage regulator modules from LM317 adjustable regulator block and dual op-amp LM358 constitute, by comparison LM358 voltage output and set up and control the output of LM317, so as to achieve more precise output, with the three digital tube dynamic display the output voltage value, accurate to 0.1V.)