Question

谁帮我翻译下下面的英语，谢谢了，急！

You will need to have the pinout for the specific LED display that you use so that you know how to wire the outputs of the 7447 to the LEDs in the 7-segment device. (Also, note that the 7448 is equivalent to the 7447 except that it drives common-cathode displays. Ground the common cathode of the LED in that case.)
You can see that by extending the circuit, we can easily create a complete clock. To create the "minute hand" section of the clock, all that you need to do is duplicate the "second hand" portion. To create the "hour hand" portion, you are going to want to be creative. Probably the easiest solution is to create a clock that displays military time. Then you will want to use an AND gate (or the R inputs of the 7490) to recognize the binary number 24 and use the output of the recognizer to reset the hour counters to zero.
The final piece you need to create is a setting mechanism. On a breadboard, it is easy to set the clock -- just move the input wires to drive higher-frequency signals into the minute-hand section of the clock. In a real clock, you would use pushbuttons or switches and gates to do the same thing.
If you happen to take your bedside clock or watch apart, one thing you will notice is that there are probably not 15 TTL ICs inside. In fact, you may not be able to find a chip at all. In most modern clocks and watches, all of the functions of the clock (including the alarm and any other features) are all integrated into one low-power chip (in a watch, the chip and display together consume only about a millionth of a watt). That chip is probably embedded directly into the circuit board. You might be able to see a blob of black plastic protecting this chip. That one tiny chip contains all of the components we have discussed here.
Now you have a complete understanding of how digital clocks work. The next time you look at the clock beside your bed or at your digital wristwatch, you can do so with a new respect for what is going on inside! If you would like to advance to the next level and see how to build a digital clock with a microcontroller, see How Microcontrollers Work.

不要翻译工具直接翻译的，要通顺的，谢谢了！

Answer 1

你将需要为特定的pinout LED显示屏,你可以用它使你知道如何线输出的LED灯的7447在7-segment装置。(注意,这个7448相当于7447除了它驱使common-cathode显示器。普通阴极的地面领导在那种情况下)。
你可以看到,通过扩展的电路,我们就可以很容易地创建一个完整的时钟。创建“分针”部分的时钟,所有你需要做的就是复制"二手”部分。创建“时针”部分,你要想成为有创造性(的人)。可能是最简单的方法就是创建一个时钟显示军用时间。然后你将会想要使用一门(或研发投入的7490二进制数字识别的输出和使用24小时的辨认重置计数器为零。
最后你需要创建是设定的机制。在模拟板,它很容易把时钟拨——只是输入导线开车高频信号进入minute-hand节的时钟。在一个真实的时钟,你将使用按钮或交换机和盖茨做同样的事情。
如果你碰巧拿你的床边闹钟或手表拆开,但有一件事是你将会注意到是有可能不是15 TTL芯片里。实际上,你可能无法找到一个芯片。在大多数现代的钟表,所有的功能的时钟(包括报警和其他功能)都融入一个低能芯片(在一个表,并显示在一起消耗大约只有百万分之一瓦特)。那片可能是嵌入式直接进入了电路板。你可以看到一个斑点的黑色塑料保护这片。这一微小的芯片包含所有的部件,我们已经讨论了这里。
现在你已经完全理解数字时钟工作。下次当你看着时钟旁边的床上或在你的数字手表,你可以用新的尊重到底是怎么回事!如果你想要晋级下一阶段,看看如何建立一个数码时钟和单片机,看看微控制器的工作。