说明：  本设计将系统分为电源模块，单片机控制模块，显示模块和PIC输出驱动模块共4部分组成。电源模块主要由外接交流电源和变压整流电路、可调稳压管组成；单片机控制模块主要由AT98S51单片机和其外围电路组成；显示模块包括1602液晶显示部分和按键输入部分；驱动模块主要由稳压芯片LM317，三极管及其配套电路组成。
(This design system is divided into the power modules, single-chip microcomputer control module, display modules and PWM wave output driver modules 4 parts. Power supply module mainly by the external ac power and secondary filter circuit PI type of filter circuits Single chip microcomputer control module mainly by the AT98C51 single-chip microcomputer and its periphery circuit composed Display modules including digital tube display section and keyboard input part PWM wave output voltage driver module mainly by LM317 chip, transistor and its matching circuit component.)