loading
The video step by step tutorial

It is better to watch this video in HD formats.






How to use this invisible earphones?
        First you need to put a tiny magnet in one of  your ears or put two in both of  your ears. Then you need to wear a coil necklace which is connected with an amplifier. Next connect your mp3 player to the amplifier.  Cover the coil necklace and the amplifier properly with your clothes.Turn it on. Now you can enjoy music without being noticed by other people. You can use another small magnet to get it out.  This sort of Invisible headphones is sold on ebay.


 Warning
 Warning
(Warning : Don't put the magnet deeply in your ear. Although there is no medical proof that says magnets will cause trouble to your ear , it's better not to use this device for a long time. Magnetic fields can disrupt the operation of some internal medical devices such as pacemakers.Neodymium magnets are made with special powders and coatings, so they are very fragile. They are often plated with a metal such as nickel. The magnets can fracture at temperatures over 150 °C, or under impact as a result of their own acceleration. When this happens, in some cases the magnets may break apart so suddenly that flying pieces can cause injury.
Make sure that there are no magnets around you, when you use this device. These magnets can move with surprising force when exposed to another magnet or magnetic field.
)



If you don't know what you can do with this device. please watch this video. (Just for Fun

Step 1: How Invisible Earphones Work

As you know, in a normal speaker. The magnet stays still.  The coil vibrates producing sound. Unlike the normal speaker, when this device is working , the coil necklace which is around your neck stays still.  The magnet vibrates in your ear producing sound. 

Step 2: Find the Proper Magnet for Your Project

I' ve tested magnets of different sizes. And I might find the best size for this project. You can buy this sort of magnets on ebay by searching the key word "  Neodymium magnet" .  Actually, there is a resonance frequency.  The bigger the magnet is, the lower resonance frequency you'll get. 

Step 3: How to Make the Coil Necklace Part.1

What you will need: 1. cardboard
                                     2.enamelled wire  ( Length=50meters  Diameter=0.25millimeter )           

Enamelled wire is a kind copper wire which is coated with Polyurethane. I use a cardboard to wind the coil necklace. Make sure the diameter of  this coil necklace is larger than the diameter of your head.  The resistance of  the coil I made is about 23ohm.

Step 4: How to Make the Coil Necklace Part.2

Cover the coil necklace with tape to protect it.   In order to connect the wire to the amplifier., you need to solder on the tip of  the wire. So  you need to use a knife to get rid of the plastic layer on the tip of the wire. 

Step 5: The Amplifier

The LM386 is the power amplifier.  The power supply consists of two 9 volts battery. Actually , there are there types of LM386. According to the datasheet, only LM386-4 can work with 18 volts power supply.  I find out that LM386-1 can also work for at least 10 minutes  with 18 volts power supply. But I am not sure how long it will work. 

Component List :
            Capacitors  220uF      X 1
                                  10uF        X 1
                                  100nF      X 1
                                  47nF         X 1
            resistors     10 ohm    X 1
                                  1k ohm    X 1
           LM386                            X 1
           9 volts battery                X 2
                                

Step 6: Final Assembly

Put the tiny magnet in one of  your ear. Connect the coil necklace to the amplifier .  Put on the coil necklace.  Turn it on.


If  you succeed in making this device , you can send me a e-mail with the picture of your work. I'll put the picture at the end of  this tutorial. 
I have made it and it work very well thantks to you ! i have the LM386-1 and only 3 accus of 1,5V !! i have put the tiny magnet in plasticine.
<p>please can you help to make coil necklace how mich turn i need for the best result</p>
<p>do you have ohm meter?</p>
i didnt remenber very well but i think 60 meters of 0,28mm varnish copper wire , dt forget to take off the varnish before soldering
<p>I wonder if you could create a tooth cap for the magnet so it'd vibrate through your jaw and you'd hear it that way. </p>
<p>I bit one and it worked. Mines from ebay, the volume is quality of sound is poor in the ear.</p>
<p>This is my new amplifier. Went back to just a single 9v battery and 50 laps on the coil. Works like a charm! Great project! </p>
<p>what size magnet did u use</p>
<p>Hi man what up. willl you please help me add to it a Mic so you can use it with a phone instead&sect; it'll be so appreciated</p>
<p>looks awesome gratz can u help me make one ? please Daniel.olm13@gmail.com</p>
<p>hey the bigger the magnet the bigger the sound?</p>
<p>Awesome project! Even though one of the capacitors get very hot. Probably need to make a new coil necklace because the current one is only about 15 meters long. Still, I can hear quite clearly with the 6 mm magnet and the coil around my neck! </p><p>Thanks again for the awesome project! </p>
<p>Hi man what up. willl you please help me add to it a Mic so you can use it with a phone instead&sect; it'll be so appreciated</p>
Hi Frank. Is there a way to add a Mic to it. In order to use it on a phone and not an MP3. Nothing illegal about that lol cuz it's for 10$ on eBay.
Please you can hep me my invisible head phone is didnt worked ??<br>What the problem ? <br>(i am sorry for english iam syrian )
Help*
<p>it's a mess out there dude,, and there is a possibility that u have shorted ur IC.. </p>
<p>hi,,,,brother can u tell me,,all that name of parts u used here,,,,,thanks in advnc</p>
My device is not working ??? I connect points 2 and 4 and and put all negative point on 4 .
<p>you can isolate pin 2 just for the &quot;negative/ground&quot; input, and don't connect it to other ground connectors ;)</p>
<p>I have heard that someone doing the same but thоse headphones run on a one battery only (9v)</p><p>do you have an idea, or just a scheme for this type</p>
<p>Their tiny earpieces rest on the outer ear or need to be inserted into the ear canal. Ultracompact and lightweight, earbuds are the most portable of all &lt;a href=&quot;http://www.latestone.com/headsets&quot;&gt; Earphones&lt;/a&gt;, and they can provide excellent isolation from external noise when paired with a well-fitted tip.</p>
<p>I made it! I used abot 60 meters of 0.25 Coil, but i must say it is very quit. If you gold your finger on the magnet, u can hear it &quot;clearly&quot; and louder. All in all it was very easy.</p>
<p>can i put the coil around the waist? and is there a minimum # of turns for the coil ? thanks in advance</p>
<p>can i put the coil around the waist? and is there a minimum # of turns for the coil ? thanks in advance </p>
<p>Hey i using LM386 1 what happens after 10 minutes? You said it would work for 10 mins..</p>
I made it and kept those tiny magnets in the earphone buds...
<p>HarshitS17 can u help make on for me? I urgently need one.</p>
<p>plz,,help,,,,,can someone tell me all parts name used here,,,,,,plz,,,,,,</p>
Youre so genius! Thanks for share your own work
<p>Can i use it when raining because i am scared that i will hit by the lightning</p>
<p>are these magnetic coils?</p>
Were is conectede the bateries an the jack????please help me
I need it for today<br>
<p>hey can anyone show me what i need for the amplifier ?! please .</p>
<p>Coil better work when you have coil resistion 8 Ohm because output impedanse (resistin) of amplifier is 8ohm, you can calculate how long you need wire, and with amplifier better use 2x9v battery, because gain is better, sorry for bad eng, i am from Serbia :D</p>
brat moj!
<p>hahaha :D</p>
amazing, only that each one need a little more ergonomy
I have a problem that 2 battery of 9 volts have just half our of duration work. If you have another schematic for a circuit that lasts for two hours please share it <br>I need this device for two hours, exam time!
How to connect the coil to the amplifier?... Whr should it be soldered on the coil?
at the speaker input pins
what type of modifications are needed to long last battery backup.?<br>I want to use it for couple of hours
<p>Can someone make the Project on the Fritzing Please it will be very helpful :)</p>
<p>it's basically this one: <a href="http://fritzing.org/projects/altoids-amp" rel="nofollow">http://fritzing.org/projects/altoids-amp</a> . not exact the same circuit but anyways an amplifier with switch and poti to control the output</p>
<p>Wireless micro earpieces hidden in ear</p><p>Invisible micro wireless earpieces, to receive and send audio and video information without being seen. Very powerful ultra-miniature microphones allow you to send data in a clear and reliable way. From the other side, you can receive hints through advanced technologies like Bluetooth, GSM, VHF, 3G. The received voice and image data will be clear and knowable. Hidden earphones and invisible microphones compatible with smartphones, iPhone, iPad, tablet, notebook and mobile phones.The micro wireless earpieces kit can have several applications: undercover operations, security body guard, news reports, TV presenters, actors, investigators, job interviews, public speeches of politicians, exams and tests, presentations in general. After the purchase is ESSENTIAL OUR FREE SUPPORT, which will help you to understand how to use the product. Our technicians will be at your disposal at any time to help you to solve any kind of problem related to the use of device.</p><p>http://www.endoacustica.com/wireless_micro_ear_piece_mobile_phone.htm</p>
How to connect (whatbto connect where) all wires batteries 3.5mm jack or any thing else in a purchased LM386
<p>what is the # of the wire ?</p>
<p>Wire diameter = .25 mm(with enamelled or without enamelled)</p>
<p>how to make bluetooth ear piece</p>

About This Instructable

272,645views

620favorites

License:

Bio: Living in the center of the world factory FrankGuYun@gmail.com
More by Frank_GuYun:Make Your Own Invisible Earphones (including step by step video) 
Add instructable to: