OVERVOLTAGE_INDICATOR

Published:2009/7/21 10:28:00 Author:Jessie | From:SeekIC

Routes line voltage automatically to black box designed to handle it. Potentiometer is set so neon lamp TH fires at 152 V. This applies high negative voltage to grid of tube, deenergizing relays K1 and K2 so line voltage is applied to upper black box. This condition also exists when system is first connected to line. After tube is warmed up, it switches to low-voltage box if line is below 152 V. Rectifier CR is any 2,000-V low-current rectifier, such as Sarkes Tarzian 126-100-H-Q. NE68 glow lamp TH must be in lightproof box; NE2 can be used only if suitably aged.-Overvoltage Indicator, Electronic Circuit Design Handbook, Mactier Pub. Corp., N.Y., 1965, p 124.



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