74ls48 接共阴数码管，如果74ls48不接上拉电阻还能正常点亮数码管么？就告我能否点亮就行...
推荐回答（1个）
74ls48 接共阴数码管,74ls48 内部有2K上拉电阻，可输出电流2MA左右，能点亮超高亮的LED数码管。
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