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指针式钟表的秒钟几乎都是机械式，有些钟表就根本不设置秒针。本文介绍一种发光式的电子“秒针”，可供爱好者制作。电路如图1所示。除秒脉冲发生外，使用8块4O17和2块4O81门电路。60个LED分别连到8块4017相应输出瑞，表示“秒针”。图中对LED仅示出A1第3脚表示零秒整点位的一
Almost all second hand pointer watch is mechanical, some watches do not set the second hand. This article describes a glowing electronic “second hand” that fans can create. Circuit shown in Figure 1. In addition to the second pulse occurred, the use of 8 4O17 and 2 4O81 gate. 60 LED were connected to the eight 4017 corresponding output Swiss, said “second hand.” The figure shows only the first three feet of A1 LED zero whole point bit one