冰箱门报警器电路图

元件BOM表：
R1 = 10K - 1/4W Resistor
R2 = Photo resistor (any type)
R3 = 2.2M - 1/4W Resistor
R4 = 1M - 1/4W Resistor
C1 = 10µF - 25V Electrolytic Capacitor
C2 = 100nF - 63V Polyester Capacitor
D1 = 1N4148 - 75V 150mA Diode
IC1 = 7555 or TS555CN CMos Timer IC
IC2 = 7555 or TS555CN CMos Timer IC
BZ1 = Piezo sounder (incorporating 3KHz oscillator)
B1 = 3V Battery (2 x 1.5V AA, AAA or smaller type Cells in series）