石英钟价廉物美,民宅有的用2～3块石英钟,不足的是夜间要看时间必须动手开灯,还影响他人休息。利用廉价的发光二极管加几只电子元件,让石英钟夜间发光兼做小夜灯,一举两得,还锻炼了动手能力,有趣有益,电路如图1所示。 Quartz clock cheap, some residential houses with 2 to 3 quartz clock, less than the time required to turn on the lights at night, but also affect others to rest. The use of cheap light-emitting diodes plus a few electronic components, so that the quartz clock at night luminous nightlights do double benefit, also exercise ability, interesting and useful, the circuit shown in Figure 1.