5、ngthewarningcircuitwiththecontrolcircuitandhost'sswitch,twotheabove-mentionedpartsmakeupthesubjectcircuit.Throughtimingcircuitanddeciphersecondsignalfunctionwhileoutputsandrealizescountingonthedisplayingthatpulseproducecircuit,formandexpandthecircuit.Keywords:Vieforansweringthecircuit T