搜索 - 科创

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图上有一个二极管和一个电阻并联在一起这个我就不明白起什么作用了二极管和电阻并在一起哪不是失去了二极管单向作用的特性

用了：2个45112个40112个45183个40691个NE555由于4511是驱动共阴数码管的，而我手头只有共阳的，所以用了3个4069转换电极4011是用来进位的，4518是用来计数，并把BCD...

要出的商品就像ru沟，挤一挤还是会有的········题外话[s:274] 切入主题鸟总体物品：风扇拆机：是可用：是 ...

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