2_35V_VARIABLE

Published:2009/7/19 20:43:00 Author:Jessie | From:SeekIC

Wide voltage range is achieved by using μA723 regulator IC in simple feedback arrangement requiring only single pot to vary output voltage continuously and linearly from 2 to 35V. Resistors R3 and R4, divide output voltage by 5, so inverting input of regulator sees one-fifth of output voltage. R1 is connected between 7-V reference ofIC and ground to present any intermediate voltage to noninverting input. IC acts to keep these two voltages equal. Maximum input voltage limit is 40V; if possibility of higher voltages exists in lab applications, protect IC with 40-V zener across it.-J. Gangi, Continuously Variable Voltage Regulator, EDN Magazine, Feb. 20, 1973, p 91.



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