Make a FARADAY CAGE

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关于:我是一名来自印度的电子和通信工程本科学生,a DIY enthusiast,and hobbyist.I like making fun and sometimes useful and educational projects.我喜欢在酷酷的互联网上工作…

Purposefully block your cell phone signals.

比如说,现在是你的大学考试季节,你想不受干扰地学习一段时间,或者,你的亲戚时不时打电话来烦你,或者,you don't want to talk to anyone but at the same time you don't want to hurt someone's feelings by hanging up in the face or by rejecting their calls or,maybe your girlfriend wouldn't stop calling you...不管是什么情况,It could be pretty hard to ignore calls and come up with some legitimate reason at the same time.但在这之后…
The most forgivable Excuse for not picking (or not receiving any calls in the first place) calls is definitely a USER NOT REACHABLE or an OUT OF COVERAGE message from the service provider.如果你不在保险范围内,为什么会有人争论??But in this connected world,one can only be out of coverage if he is living underground or something...Well,In this instructable,我将向你们展示如何创建自己的个人和便携式的不可到达区域。麦克尔·法拉第支持你。

Also,this project will help you understand why your phone loses signal in a closed type elevator.

Step 1: A Little Bit of Science and History About Faraday Shield/cage

法拉第笼或法拉第屏蔽是用来屏蔽电磁场的外壳(手机信号是电磁信号)。法拉第屏蔽可由导电材料的连续覆盖物形成,或在法拉第笼的情况下,用这种材料制成的网。法拉第笼是以英国科学家迈克尔·法拉第命名的,是谁在1836年发明的。

A Faraday cage operates because an external electrical field causes the electric charges within the cage's conducting material to be distributed such that they cancel the field's effect in the cage's interior.This phenomenon is used to protect sensitive electronic equipment from external radio frequency interference (RFI).Faraday cages are also used to enclose devices that produce RFI,such as radio transmitters,防止他们的无线电波干扰附近的其他设备。它们还用于保护人员和设备免受雷击和静电放电(或玩高压特斯拉线圈的疯子)等实际电流的影响,因为封闭笼在封闭空间的外部传导电流,而没有电流通过内部。

图片来源:维基百科

Step 2: Gather All the Components

This little project can easily be made using some household junk.

  1. Sneak into your girlfriend's/sister's room and find the box of her most expensive shoes.Throw away the shoes because you won't be needing them and keep the box,that's what you'll be needing.这是你自己的风险!…你需要找到一个相当完整的鞋盒或任何纸板箱的大小大致相同。
  2. 白色嗜好胶。
  3. 装载订书机
  4. aluminum foil
  5. A shielded cable.It's not absolutely necessary to use shielded cable,you can use solid copper wire too but shielded cable worked best for me.通常,优质的USB电缆被屏蔽,在电缆盒中找到一个备用电缆(每个房间至少有一盒电缆:P),然后切断两端的USB连接器,剥开外部绝缘层,你会看到内部电线周围有一个金属丝网(金属丝网的用途类似)。It acts as a Faraday cage and prevents any exterior electrical interference while transferring data).
  6. Xacto刀/爱好刀。
  7. access to mains earth connection(在电源周围工作时要非常小心,根据当地标准电气连接规则,确保哪个连接是接地的。In India green wire is the earth connection red is Hot i.e.220VAC和黑色为中性。Also,make sure the switch is in off position because the project does not require any power only earth connection is needed for which you don't have to turn on the power switch as it is directly connected to ground.If you absolutely have no idea on how to work with mains then,stay away or ask an adult or experienced personnel for help)
  8. and last but not the least A roll of Electrical tape.

Step 3: Okay Let's Build It

  1. 剪一块铝箔,铝箔的大小足以覆盖鞋盒/纸板箱的所有表面。
  2. 在所有外表面以及鞋盒/纸板箱盖上涂抹胶水。
  3. 开始在盒子的外表面贴铝箔。Try keeping the foil in as one single piece as possible.if any tears or gaps arrises,use some more aluminum foil as a patch on the torn areas.make sure all of the outer faces are wrapped in a single piece of aluminum foil.关闭盖子时,所有表面必须具有良好的电气连接。
  4. 确保盒子外部没有任何开放空间,当盖子关闭时,整个盒子需要导电。
  5. Strip off the outer insulation of shielded USB cable and twist the outer mesh as shown.you snip inner wires or you can strip them off twist them together along with the mesh wire.
  6. Use stapler pins to connect the wire to the aluminum foil on any of the exterior faces of the foil covered box.make sure it makes a good electrical connection.
  7. Strip the insulation off of the free end of the wire and twist the wires as before.
  8. 将自由端连接到地/地connection of the mains power socket.( I taped the free end of the wire to the metallic shaft of a screwdriver because I couldn't find anything else to insert in the plug and the wire alone was just too flimsy it kept falling off the earth/ground connection.) AGAINBE CAREFUL WHILE WORKING WITH MAINS SOCKET.如果你不知道它是如何工作的,不要尝试它。ASK AN ADULT OR EXPERIENCED PERSONNEL FOR HELP.MAKE SURE THE POWER SWITCH IS ALWAYS OFF.
  9. 把你的手机放在盒子里,合上盖子,试着打那个电话。如果所有的东西都连接好了,箔纸上没有空隙,then you'll hear an "UNREACHABLE" message.

There you have your very own out of coverage area or Faraday cage.现在你可以不理别人的电话了。

你可以通过包装盒子的内部并将其连接到外包装来即兴创作。

您也可以使用金属盒或锡箔食品盒,并将其接地,而不是用锡箔包装纸板盒,但出于某种原因,它对我不起作用。

SO,商场内的封闭式电梯类似于铝箔包装箱,they too are connected to earth which makes them a FARADAY CAGE and due to this Faraday cage effect,你的电话在电梯里失去信号。

我录了一段它工作的视频(下一步):)

Step 4: YAY...它的工作原理……

我模糊了我和我妈妈的联系电话,原因很明显。

如果盒子里有信号泄露,它就不起作用了。

请注意我是如何将电线连接到接地端子的,而且电源开关也处于断开位置。

the OUT OF REACH message might vary for different service providers.在我的案例中(bsnl)消息指出,“你试图联系的人要么被关闭,要么被移出覆盖区域”

also when you put your phone on flight mode,您的网络报告您的号码已关闭。

免责声明:This project is meant for educational and informational purposes only and I'll not be responsible for any damages.



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    2个讨论

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    HackerBOI seamster

    Reply 4 months ago

    thanks :) this is my first instructable.