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.

the design of 0-30V nc manostat.doc

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