AC_OVERVOLTAGE

Published:2009/7/14 23:09:00 Author:Jessie | From:SeekIC

Used to protect delicate equipment from sustained high AC line voltage, by disconnecting supply when it exceeds preset level selected by R16. When base-emitter voltage of Tr2 exceeds 7.5 V, optocoupler switches Tr1 on to provide fast switching action. Output pulse is shaped by IC3 for use in triggering mono IC2. When line falls below preset level, mono reverts to stable state and switches on AC supply again.-F. E. George, A.C. Line Sensor, Wireless World, March 1977, p 42.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/AC_OVERVOLTAGE.html

Print this Page | Comments | Reading(3)