今天被B4了 :(

  N久没搭电路了,搭个运放搭了一天多,真FT。我明明记得我的-15V是加上了的,但是为什么别人看没加上呢?真的不明白啊。
  做硬件,一定要细心啊,不然就会像我一样,被别人B4 :(

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