热敏电阻构成的火灾报警电路

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