【Hacker News搬运】555定时器电路

hackernews

Title: 555 Timer Circuits

555定时器电路

Text:

Url: https://www.555-timer-circuits.com/

很抱歉，作为一个AI，我无法直接访问外部网站或执行网络爬虫任务来获取内容。因此，我无法直接使用JinaReader或其他工具来抓取和分析您提供的链接内容。

不过，我可以提供一些指导，说明如果这是一个可以执行的任务，应该如何进行：

1. **使用JinaReader抓取内容**：
   - 首先，您需要安装JinaReader，这是一个用于文本分析和信息提取的Python库。
   - 然后，您可以使用JinaReader的API或库函数来发送请求到指定的URL，抓取页面内容。

2. **分析抓取的内容**：
   - 抓取到的内容通常是一个HTML字符串，您可以使用JinaReader提供的功能来解析和提取文本信息。
   - 您可以分析文本的结构、关键词、摘要等。

3. **翻译非中文内容**：
   - 如果抓取到的内容不是中文，您可以使用在线翻译服务或集成翻译API（如Google Translate API）来将内容翻译成中文。
   - 在翻译之前，您可能需要使用文本解析技术来识别和提取需要翻译的文本块。

以下是一个使用Python和JinaReader（假设它是可用的）进行上述步骤的示例代码：

```python
from jina import Document, Client
import requests

# 抓取网页内容
url = 'https://www.555-timer-circuits.com/'
response = requests.get(url)
html_content = response.text

# 使用JinaReader分析内容
client = Client()
document = Document(html_content)
client.index([document])

# 假设您已经安装了翻译库，如googletrans
from googletrans import Translator

# 翻译内容
translator = Translator()
translated_content = translator.translate(html_content, dest='zh-CN').text

# 输出翻译后的内容
print(translated_content)

请注意，上述代码仅作为一个示例，实际应用中需要根据具体情况调整和修改。如果JinaReader或googletrans不可用，您可能需要寻找其他替代工具或服务。

        
## Post by: okl
        
### Comments: 
        
**skinwill**: The internal diagram appears to be incorrect, <a href="https:&#x2F;&#x2F;www.555-timer-circuits.com&#x2F;inside-the-555.html" rel="nofollow">https:&#x2F;&#x2F;www.555-timer-circuits.com&#x2F;inside-the-555.html</a><p>The internal resistors should be connected to the upper comparator. Also, that diagram just seems confusing. Something like this makes more sense: <a href="https:&#x2F;&#x2F;www.theengineeringknowledge.com&#x2F;wp-content&#x2F;uploads&#x2F;2020&#x2F;09&#x2F;Internal-diagram-of-a-555-integrated.jpg" rel="nofollow">https:&#x2F;&#x2F;www.theengineeringknowledge.com&#x2F;wp-content&#x2F;uploads&#x2F;2...</a>
> **skinwill**: 内部图表似乎不正确，<a href=“https:”www.555-timer-circuits.com“inside-The-555.html”rel=“nofollow”>https:”&#x2F；www.555-timer-circuits.com；inside-the-555.html</a><p>内部电阻器应连接到上部比较器。此外，这个图表似乎令人困惑。这样的东西更有意义：<a href=“https:”www.theengineeringknowledge.com“wp content”上传“2020,”09,”555-integrated.jpg“rel=”nofollow“>https:”&#x2F；www.thengineeringknowledge.com；wp内容；上传；2</a>
            
**doe_eyes**: In some respects, it&#x27;s a testament to how much the world of electronics has changed over the past ~25 years. It used to be that 555 was this Swiss-army-knife IC that you had to learn about. Multiple people published entire books about it!<p>Today, it&#x27;s essentially obsolete. You&#x27;re quite unlikely to find it in any competently-done commercial designs. Every analog trick you can do with it can be done more cheaply, more reliably, with better power efficiency, and with fewer external components using a modern MCU.<p>It&#x27;s not that analog is dead, but it&#x27;s solving different problems now. Including how to keep ultra-high-speed digital signals usable within the footprint of a PCB - which wasn&#x27;t that much of a consideration in the golden days of the 555.
> **doe_eyes**: 在某些方面，它；这证明了在过去的25年里，电子世界发生了多大的变化。过去，555是你必须了解的瑞士军刀IC。许多人出版了关于它的整本书<p> 今天，它；它基本上已经过时了。您；我们不太可能在任何有能力完成的商业设计中找到它。你可以用它做的每一个模拟技巧都可以更便宜、更可靠、更高的能效，并且使用现代MCU的外部组件更少<p> 它；这并不是说模拟已经死了，但它；我们现在正在解决不同的问题。包括如何在PCB的占地面积内保持超高速数字信号的可用性——这不是；在555的黄金时代，这不是什么值得考虑的事。
            
**lmpdev**: We sell kits with plenty of 555 timers (including some listed here)<p>It’s a shame that Arduino has effectively truncated kids learning with a full MCU as the “building block” of their learning<p>I see it also bite them in the arse with wasteful solutions. Often a BJT or power fet is all they need (say for a basic relay trigger). But if they aren’t presented with a shiny arduino compatible module explicitly designed for what they want, they get nervous<p>About half the kids I see make the intellectual jump, half end up not coming back<p>I do wish kids were taught basic soldering, it would make the learning process a lot less worrisome<p>The 555 and LM741 are still supreme learning tools. They are even simple enough to breadboard out with BJTs and analogue components. I’ve only seen a few extremely hardcore guys bother to conceptualise under the hood that deeply
> **lmpdev**: 我们出售带有大量555定时器的套件（包括这里列出的一些）<p>令人遗憾的是，Arduino有效地截断了孩子们使用完整MCU作为学习的“构建块”的学习<p>我看到它也用浪费的解决方案来咬他们的屁股。通常，BJT或功率fet就是他们所需要的（比如说基本的继电器触发器）。但是，如果他们没有得到一个专门为他们想要的东西而设计的闪亮的arduino兼容模块，他们就会紧张<p>我看到的大约一半的孩子在智力上跳跃，一半的孩子最终不会回来<p>。我确实希望孩子们能学到基本的焊接，这会让学习过程不那么令人担忧<p>555和LM741仍然是顶级的学习工具。它们甚至足够简单，可以用BJT和模拟元件进行面包板制作。我只见过一些非常铁杆的家伙费心去深入地概念化引擎盖下的东西
            
**II2II**: Plenty of people are commenting on how modern microcontrollers are better than the 555. I agree, with a caveat: the 555 is a great learning tool. It is complex enough to be interesting, yet simple enough to be well understood. It is easy to clip an oscilloscope to it&#x27;s pins to have a visual representation of how its inputs affects its outputs. It is a stepping stone that helps people learn how to build more complex circuits. Much as some software developers have to understand assembly language to build the most fundamental bits of software (e.g. compilers), some people have need to understand electronics to build the most fundamental bits of hardware.
> **II2II**: 很多人都在评论现代微控制器比555更好。我同意，但有一点需要注意：555是一个很好的学习工具。它足够复杂，有趣，但足够简单，易于理解。将示波器夹在上面很容易；s引脚，以直观地表示其输入如何影响其输出。它是帮助人们学习如何构建更复杂电路的垫脚石。正如一些软件开发人员必须了解汇编语言才能构建最基本的软件位（如编译器）一样，一些人也需要了解电子技术才能构建最基础的硬件位。
            
**buildsjets**: Built many a 555 timer circuit back in the day!  But in modern times, I can get an ATMega328p already attached to a PC board for $2.50 and load code on it to do whatever I want, including blink a red LED.
> **buildsjets**: 当年建了很多555定时器电路！但在现代，我可以花2.50美元买到一个已经连接到PC板上的ATMega328p，并在上面加载代码来做任何我想做的事情，包括闪烁红色LED。