0_15V

Published:2009/7/19 21:54:00 Author:Jessie | From:SeekIC

Addition of 307 or 301A opamp and three inexpensive components to standard three-terminal voltage regulator provides programming capability from maximum terminal voltage down to zero. With adequate heatsink, output current can be up to 1A. Opamp A2 provides floating reference voltage to normally grounded common terminal of A1, with pot allowing ground to be positioned anywhere along voltage drop of 15V across pot. Unregulated negative supply is not critical, and drain is 10 mA.-W. G. Jung, Three Components Program Regulator from Maximum to Zero, EDN Magazine, May 20, 1977, p 126 and 128.



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