材料BOM表：

R1 = 100R-1/2W
R2 = 47K
R3 = 47K
R4 = 100R-1/2W
C1 = 0.47uF-275V
C2 = 470uF-35V
C3 = 10uF-25V
D1 = 1N4007
D2 = 1N4007
D3 = TL431
B1 = Piezo Buzzer
IR1 = TSOP1738