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材料BOM表：
R1 6K8 1/4W Resistor
R2 270K 1/4W Resistor
R3 22K 1/4W Resistor
C1 220µF 25V Electrolytic Capacitor
C2 10µF 25V Electrolytic Capacitor
D1 1N4002 100V 1A Diode
Q1 BC557 45V 100mA PNP Transistor
Q2 BD139 80V 1.5A NPN Transistor
LP1 Existing filament Lamp: any type in the range 3-24V 10W max.
SW1 Existing On-Off switch
B1 Existing V DC source: any type in the range 3-24V
suited to the lamp adopted | 
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