冰箱门报警电路

材料BOM表：

R1 10K 1/4W Resistor
R2 Photo resistor (any type)
R3,R4 100K 1/4W Resistors
C1 10nF 63V Polyester Capacitor
C2 100µF 25V Electrolytic Capacitor
D1,D2 1N4148 75V 150mA Diodes
IC1 4060 14 stage ripple counter and oscillator IC
Q1 BC337 45V 800mA NPN Transistor
BZ1 Piezo sounder (incorporating 3KHz oscillator)
SW1 Miniature SPST slide Switch
B1 3V Battery (2 AA 1.5V Cells in series)