摘要： 材料BOM表：R1 = 6.8K R2 = 270K R3 = 220K D1 = 1N4002 C1 = 220uF-25V C2 = 10uF-25V Q1 = BC557 Q2 = BD139 B1 = Any type in the range 3-24V B1 = Suited to the lamp adopted LP1 = Filament Lamp 10W-3V to 24V SW1 = On-Off Switch (责任编辑：电路图)