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help with voltage comparator

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elijah

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pls,help me with a circuit that can compare three 3 different voltages.each occuring when there is a voltage drop to a certing level.let say voltage A when a certain voltage drop occurs.the same applies to B AND C.none will switch with the other.this is found in our automatic voltagt regulators
 
comparator

hi ,thanks for ur respond.yes i want to regulate from an unregulated voltage. if my 220ac voltage drops,the comparetor will swiitch to a lower dc voltege,hence the,ralay activated while the other two remain open.please help me
 
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