Jul 16 2020 what is automatic voltage regulator avr and how it works in portable generators an operation theory and schematics. Voltage regulator using lm723 ic which is linear regulator from national semiconductors the input can be upto 40 volts and its output can be adjusted from 2 volts to 37 volts without any adjustments the ic can deliver upto 150ma current and further improvements in current can be attained by adding a series pass transistor in our case mj3001 a darlington transistor. Automatic voltage regulator the automatic voltage regulator is used to regulate the voltage it takes the fluctuate voltage and changes them into a constant voltage the fluctuation in the voltage mainly occurs due to the variation in load on the supply system the variation in voltage damages the equipment of the power system. International journal of computer applications 0975 8887 volume 178 no1 november 2017 24 modelling and simulation of automatic voltage regulator system modu m ibrahim