LOW_VOLTAGE_ALARM_1

Published:2009/7/14 22:53:00 Author:Jessie | From:SeekIC

Simple indicator circuit uses hex inverter IC to monitor several different input voltages. Technique is flexible and easily modified for different voltage values (either positive or negative) and additional in-puts. When negative input (V1, V2, or V3) falls below breakdown voltage of its zener, logic 0 appears at inverter output (at wired-OR connection). Because lamp-driving inverter has logic 0 at its input, lamp goes out as no-go signal. When positive input V4 falls below predetermined value, logic 0 again causes no-go indication,-R. J. Buonocore, Under-Voltage Sensing Circuit, EDN/EEE Magazine, Dee. 1, 1971, p 48-49.



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