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3只锂电池串联后的电压约12V，要为其充电，要用12.6V的充电器，而这种充电器不易买到。12V的电源很容易找到，如显示器电源。附图所示电路，可将12V电源变换成12.6V，再向锂电池充电。该变换器设有充电指示灯，可指......
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Colour sensor is an interesting project for hobbyists. The cir- cuit can sense eight colours, i.e. blue, green......
Dew (condensed moisture) ad- versely affects the normal per- formance of sensitive electronic devices. A low-c......
dolphin 2016-08-25
dolphin 2009-08-25
dolphin 2009-08-25
dolphin 2009-08-25
