UNDERVOLTAGE_ALARM

Published:2009/7/14 20:56:00 Author:May | From:SeekIC

3905 timer output goes high when power supply drops below predetermined voltage level. Timer is connected as inverting comparator that compares fraction of supply voltage (as set by R1) with fixed voltage-comparison threshold of 2 V for timer. Output can be used to drive suitable alarm indicator.-W. G. Jung, IC Timer Cookbook, Howard W. Sams, Indianapolis, IN, 1977, p 230-231.



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