搜索 - 科创

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不好，七段译码器不好找，可能也不便宜，而且这样子得要四个一位的数码管，光数码管至少就得4*7条导线。况且cd4017输出的既不是bcd码，又不是七段码[s:275]相比之下，STC几块钱就能搞到一片。

我这纯业余爱好者只能用这种简单明了的设备啊，什么多大直径的发动机添装什么样的燃料有多少重量等等，什么情况下可以推出多少重量。用这简单的设备虽然不精确但是非常直观[s:228]

用一个小型的交流电机绑定换向器转动周期和电压周期对应，可以做到零电流零电压换向强制把负半轴转过来对于电机来说50Hz速度太快，可以级联多个换向器，增加定子电极数量（转速变慢）

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