摘要： 下面是 [热敏电阻构成的火灾报警电路]的电路图　　材料BOM表：R1 = 470R R2 = 470R R3 = 33K R5 = 560R R4 = 470R R6 = 47K R7 = 2.2K R8 = 470R C1 = 10uF-16V C2 = 0.04uF-63V C3 = 0.01uF-63V Q1 = BC548 Q2 = BC558 Q3 = SL100B D1 = Red Led D2 = 1N4001 IC1 = NE555 SPKR = 1W-8R TH1 = Thermistor-10K(责任编辑：电路图)