NASA NTRS · 19700000547
Redundant electronic circuit provides fail-safe control
Abstract
Circuit using dual control amplifiers and dual position demand potentiometers powered from separate sources is used for reliable hydraulic valve controller that prevents closure of valve when control circuits fail, and maintains valve control to close tolerance for more common modes of controller failure.
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Archer, J. W.. 1970-11-01. Redundant electronic circuit provides fail-safe control. https://ntrs.nasa.gov/citations/19700000547
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