The circuit explained here will provide LED indications and show if there's a possible fault in the wiring of your home AC Phase, Neutral, and Earth connections. The idea was requested by Mr. SS kopparthy.
技术规格
先生,早上好。我谢谢你的帮助。I further wanted you to consider a circuit whose pics are attached with links given.
This pcb would indicate me when earth is leaking(at that time the tester would burn when touched to earthing pin in 220v socket and will get a strong shock when touched by mistake.
即使是当时的电器金属物体也会引起震惊。。
我还试图通过看到PCB来绘制电路图。相同的PCB表示保险丝的条件。对于PCB的电路图和图片，请参阅“
sir, i hope you understand the working of circuit and also hope you'll tell how its working to me also.......the purpose of writing this is that i would like you to help me by designing the circuit which has buzzer with led indication when something goes wrong. thank you very very very very very very very very much sir.........i cannot forget your help......
Using 3 LEDs for the Indications
可以使用仅三个LED和一些电阻来简化上述电路。
The circuit may be understood as follows.
提议的实时或相位，中性，地球指示器电路的设计相当简单。
As can be seen in the given diagram one LED is connected across the phase/neutral, another LED across phase/earth and a third one across neutral/earth.
每个LED的限制电阻器额定值为56K 1瓦。
LED对不同的L/N/E有故障条件的照明可以见证：
LED1和LED2 ON和LED3 OFF表明了一个良好的总体情况，在该阶段，中性和地球都可以正确地合并到所有阶段。
LED2 and LED3 ON and LED1 OFF indicates a wrong polarity of phase/neutral but earth and neutral may be assumed to be rightly configured.
All three LEDs ON indicates an open earth or neutral which may be diagnosed further. Since an open neutral is rare, the possibility of an open "earth" could be considered and investigated.
In addition to the phase, neutral, earth fault indications the circuit also employs a blown fuse indicator in the form of LED4 which simply lights up if the fuse is blown or open and a appliance hooked up.
请注意，LED的极性不是至关重要的，可以用任何方式使用。
Use of red LEDs is recommended, other types could show unusual responses.
地球泄漏传感器和蜂鸣器电路将很快更新。
Simplified Schematic
嗨，斯瓦加塔姆..
是否有机会看到一个无转换电源逆变器的电路，例如12/9amp至220 V或6V/4安培到15V？
Hi Ahmad,
我将在不使用复杂公式的情况下根据特定需求破解如何根据特定需求来设计铁矿变压器后立即开始串行发布它们，直到那时很难。
sir i build this and working fine but my collage sir ask me how i choose 56k resistor i need formula and explanation i mailed u also please reply as soon as possible thankx in advance
Vivek，已任意选择，以使LED产生良好的亮度，并且电阻保持凉爽……
although the actual formula is (220V – 3.3)/0.02….this gives around 11k but this value will need to be of 220 x 0.02 = 4.4 watts which can be bulky therefore 56k was chosen so that 1/4 watt could be used.
先生，很多谢谢
What is the reason for C1?
这可能是一个动作，而不是电容器
嗨，斯瓦格坦先生
In my country (Iran) there is no earth and I have circuit that need real phase and null entered , and
If the reverse were entered ،
该电路直到相位和中性是正确的。
请引导我
嗨，哈米德，
you can use a neon line tester to verify which side was the phase, and then plugin the device with correct polarity.
I hope I understood your requirement correctly…
Hi dear Swagatam
I have 3 questions about the first pic circuit :
1) In which amount of earth resistance, this instrument shows that earth is faulty?
2) If earth is disconnected, are the other tests (like L&N inverse) possible?
3) Can this instrument show that earth and ground are connected to each other, inside wall ?(if yes, which fault will be showed ?)
谢谢您的帮助
阿斯兰（Aslan），我无法解释第一个电路，因为它不是由我设计的，而且因为我觉得它不是正确设计的。
嗨，斯瓦加斯先生，您能把电路的PCB示意图发送给我吗？我一直在寻找它很长一段时间。第一个给定电路有什么问题吗？我有一个与此相似的东西，但以某种方式烧毁了。所有三个LED和2个电阻都被烧毁。
嗨，Binoj，对不起，我没有这个项目的PCB设计。使用1瓦的线条电阻，它们不会燃烧
Hi Swagatam,
我正在为扩展板（230-250 VAC，50 Hz电源）进行EMI/RFI滤波器和潮激抑制电路，并寻找相同的标准电路。您能给我发送优化的PCB电路和EMI/RFI过滤器和电涌抑制电路的示意图吗？
Regards,
Umesh
嗨，Umesh，您可以尝试以下电路：
感谢Swagatam的及时回复。是否有可能包括指标LED用于相，中性和地球。我正在修改过电路，但不知道它是对还是错？我无法在评论框中与您共享电路图像。还有其他共享电路的方式吗？
Regards,
Umesh
Umesh, for LED connections you may have to implement the second circuit which is explained in the above article. You can also try your modified design by connecting the L, N. E wires across the relevant lines. You can share the image through Google drive.
Hi Swagatam,
再次感谢您的回复。根据您的电路详细信息，并将其与LED指示结合在一起，我准备了修改的电路。请检查下面的Google Drive链接以获取评论，并告诉我是否需要更改。
https://drive.google.com/file/d/1KEQghUqLpgeGl9pI4kFfMxBHs85t_orP/view?usp=sharing
Regards,
Umesh
嗨，Umesh，请更改指向共享模式的链接，以便我可以访问它。
Hi Swagatam,
Please access following link.
https://drive.google.com/file/d/1KEQghUqLpgeGl9pI4kFfMxBHs85t_orP/view?usp=sharing
Regards,
Umesh
Hi Umesh, the LEDs should be on the switch side according to me, as shown below.
But the RFI section is not as per my design so I cannot comment on that.
我们可以得到一个用于组装地下 - 地下断层指示器电路的PCB吗？