本帖最后由 novakon 于 2014-8-14 22:46 编辑
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虎哥 发表于 2014-8-14 01:57
很巧妙的办法,别小看这一支电阻,现在能自己想出办法改进电路的工程师已经很少了。
我的疑问是:用LED ...
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