OVERVOLTAGE_ALARM

Published:2009/7/14 21:24:00 Author:May | From:SeekIC

Connection shown for 3905 timer makes output go high for energizing suitable alarm when supply voltage rises above predetermined level. Timer is connected as noninverting comparator that compares its fixed voltage-comparison threshold of 2 V with fraction of supply voltage determined by setting of R1. Optional resistor R4 can be added if some hysteresis is desirable to prevent tripping of alarm by momentary fluctuations of supply.-W. G. Jung, IC Timer Cookbook, Howard W, Sams, Indianapolis, IN, 1977, p 230-231.



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