用单只开关巧控多组灯

用一只单开关控制多组灯，不仅可以省掉很多开关，而且也给自己动手制作增添乐趣。 如附图所示的电路。当电源开关Ｋ第一次接通时，１＃灯立即点亮，由于电容器Ｃ３上电压不能突变，光耦合器Ｇ只在开关Ｋ接通瞬间

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