The introduction to this text regards AT89C51 one-chip computer as the control module, export the reference voltage in order to count mould converter DAC0832, control and change module LM350 to output the size of voltage in order to consult the electricity. AT89C51 one-chip computer is a master controller, the output controlling the direct current power through the button is pressed, setting up can reach 0.1V to walk into the grade , and can be shown that outputs the voltage establishing value actually by the digital tube. This system is outputted the digital signal.programme-controlledly by the one-chip computer, output analog quantity through D/A converter (DAC0832 ), and then undergo the operation amplifier to isolate and amplify , control the base that output power is in charge of, output different voltage as the power is in charge of the change of the voltage of base. One-chip computer give consideration to also for constant voltage system it control ,it output by voltage through electric current /after voltage change, change through A/D chip is real-time to analyse and process analog quantity person who turns data into by one-chip computer and then, through the feedback link of the form of the data , make the voltage more steady , form the steady voltage source like this.
Keywords:One-chip computer; Mould converter (DA ); Count the numerical control power
