怎么用3个74HC164和3个74HC138驱动12数码管?
怎么用3个74HC164和3个74HC138驱动12数码管? 你都暗示得这么明显了,当然是4个一组共3组同时扫描喽。 为什么要用3个138,应该2个就够了啊 怎么用3个74HC164和3个74HC138驱动12数码管?easy: use 1 hc164 and throw away the rest.
millwood0 发表于 2012-8-21 08:10 static/image/common/back.gif
easy: use 1 hc164 and throw away the rest.
大侠帮指导一下,谢谢了
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