烟雾检测器使用两只晶体管构成达林顿放大器和一只光耦器件作传感器。在检测环境下如果有浓雾出现，烟雾检测器就会发出声光告警信号。-this is portant,so you must have to kown it ,if you wan to have a elecle thing ,so ,you must hai to reade it.