When i was small, i usually think how these Wireless headphones work. What magic makes them work! But now i had figured out a simple way to make one with your own old (Plug-on headphones) a wireless one. Though it will work by plugging in too .It is ideal for watching movie or listening to music without sitting close to computer or T.V. It's range is not good because if it's range will be more than 5 meters you will have to buy a license But you can use it anywhere at your home cause it's signal can only reach up-to 5 meters of diameter. So, no need of buying license. I hope you will enjoy it and for staying tuned to me be a subscriber and

Please vote for me.I will appreciate it and thankful too.

Step 1: Thechnical Details

Once you've decided to make your own wireless headphone you need some knowledge about what we are going to do. First of all you need a headphone (An old one or which you are using). The headphone should have enough inner space (I mean to say that when you open the headphone the stuff "The radio receiver module" which we are going to install in in fit in easily). You have to buy a small radio receiver module be sure to use the smallest with auto or manual tuning. Now what we are going to do is install the radio module inside the headphone and then tune it to your Emitter's frequency and grab some of the controls of the radio module out of the headphones so that you can tune it without opening the whole headphone again. Now we move on to the Emitter, you have to make your own Emitter. It's a simple Electronics project. The circuit consists of one 2N2222 or BC547 transistor (You can use one or the other depending on the availability, But i prefer using a 2N2222 transistor) used as a base amplifier which amplifies the audio signals form your computer or T.V. and converts it into FM signal. The emitter's frequency is between 87.5 to 108.0 Mhz (Common radio frequency) and can be tuned to any frequency by changing the value of the 20-40 picofarad variable capacitor. Now FYI it's rage in not good up-to 3-4 rooms or 5meters so i my view you won't need a license for the frequency usage. You can emit any kind to audio signal from T.V, Computer, MP3 player , Mobile Phone , etc.

Step 2: Expense

This is a cheap and best project i had ever made. As far as i think, To buy all these stuff together (Excluding the headphones and the tools used) you may have to spend 10 - 30 dollars in india it's will go to 1000 rupees. The radio receiver module generally comes in 10 dollars maximum and around 500 rupees. All the electronics stuff is worth 8-10$ and 250-300 rupees. The male & female jack and the wire's and the antenna will make a bill of 10 dollars. And if you are going to buy a new headphone please buy the one with good internal space then it will charge you around 10-20 $.


Step 3: Tools You Need

Here, You only need some of the general tools which are nearly present in your house (Except the multimeter) and the soldering stuff given in the image just above .Note : The scale in given in Centimeters. The tools you need are given below:


General tools

  • Pliers ( For pealing the insulation from the wires)
  • Screw drivers : Four head and two head (For opening the headphone & for casing the transmitter or emitter)
  • A pair of scissors (For cutting the wire and other uses)
  • Pencils & Eraser (For marking the board and other purposes)
  • A cutting blade (For cutting the board)
  • Multimeter(For measurements of resistance and continuity )
  • Hot Glue GUN(For sealing purposes)

Soldering Stuff

  •  Soldering iron (For making the emitter).
  •  A wet cotton pad  (For cleaning the tip of the soldering iron).
  • Some soldering flux (For making the soldering smooth).
  • Soldering wire of different gauges.
  • De-soldering Pump (For sucking solder).
  • Brush or a tooth brush (for Cleaning the board).

Now that all particular you need  . Once you collected all these stuff now you be ready to buy some Electronics stuff.

Step 4: What to & Where to Buy

Now get ready to buy some electronics stuff and some others things. All things you need is available at Radio Shack or you can buy online. I have categorized  them in two category they are :
  1. Electronics Part
  2. Wires and jacks.

Electronics Parts

Now you have to collects all these items before moving on to the next step. All the electronics parts are kept together and  there photo (Labeled as Components) is given above . The parts can be SMT (or SMD) or even you can have lead ones no problem . If you have any doubt or confusion please contact be i will be happy to answer you. You need following parts :
  • 3 * 10K Resistors (Lead one code : Brown , Black , Orange & SMD Code: 103)
  • 1 * 5.6K Resistor   (Lead one code : Green , Blue , Red & SMD Code : 562)
  • 1 * 50 - 120 ohm Resistor (Lead one code: Green , black , black  To Brown, Red , Brown & SMD Code : 500 - 121)
  • 3 * 0.1uf Ceramic capacitor (Code:104 , If you are willing to use a SMD capacitor you need to test it by a capacitance meter because Generally there is no code written on a SMD capacitor except some like i have.)
  • 1 * 4.7 picofarad Ceramic capacitor ."This is and unusual capacitor if you can't find one use a 15p & 7p capacitor in series or you can make you own pair having the net resistance of 4.7p. FYI If you are putting the capacitors in series follow this ""http://www.electronics-tutorials.ws/capacitor/cap_7.html"" page to know how to calculate the net capacitance. " (Code : 4p7 or 4.7)
  • 1 * 20-40p variable capacitor "The picture is not shown because i don't have one so i used a 33p capacitor. " (the code is : 20 ,21------50. )
  • 1 * 0.0047uf Ceramic capacitor (Code:472)
  • 1 * BC 547 OR 2N2222  Transistor.

Wires & Jacks

You can buy these items from radishack or I am giving the web links from where you can buy them all.
  • 1 * Small tunable or automatic tunable radio module with 3v power supply. YOU CAN USE THIS ONE "http://www.ebay.com/itm/3-portable-uscan-radios-small-hand-held-/310720153283".
  • 1 * Male 3.5 mm jack .you can buy it from here "http://www.amazon.co.uk/electronics/dp/B000Q6JR1Q"
  • 1* 3v rechargeable battery. (Use as small as you can with good stand by power.) You can buy it from here "http://www.ebay.in/itm/Tiny-3V-Rechargeable-Coin-Cell-Button-Battery-MS621F-MS621FE-Very-Small-Seiko-/280743174845"
  • 18 - 22 gauge  enamelled copper wire of length 20cm.
  • 1cm dia. spool to wind inductor upon.
  • 1 * 2.5 * 2.5 Prototyping board or called Multi-Purpose PCB.
  •  A long thin copper wire and a 3 core wire.
  •  1 * 12v Male & Female power jack.You can buy them from here : Female"http://www.ebay.com/bhp/12v-female-connector" / Make"http://www.ebay.com/itm/10pair-12V-Male-Female-DC-2-1-x-5-5mm-Power-Plug-Jack-Adapter-Connector-for-CCTV-/400545050623"
  •  2 * FM Antenna or a hard long wire.
  • One USB male connecter.You can buy it from here "http://www.alibaba.com/product-gs/564447272/USB_2_0_4pin_A_SMT.html?s=p"
  • 2 * Small Switches.


Step 5: Making the Emitter

Now you have all stuff you need. It's time to move on and start making the emitter. The circuit is very easy to make .But if you want to skip this circuit making step you could also buy one FM emitter from here:http://electronics-diy.com/store.php?sel=kits&sub=fm_transmitters. If you do so no need of making the given circuit. Now move on to the circuit: This is a one transistor circuit . Before making you must draw a rough diagram.Now you have to go for power. This emitter can be powered by a 3-6v battery or a USB 5.0 V constant voltage for powering it with USB  you have to use a USB 2.0 male plug and it's polarity is given above in the image.(Just click on the images for magnifying the image)Solder the plug in the prototyping board and be sure about the polarity. Now make the circuit with extra care if you are using SMD'S.Connect the 3.5mm jack with a 3-core wire and solder it on the prototyping board being sure about the negative terminal of the jack goes to the ground of the circuit. and the two other wire will go to the input of the circuit. .Now you are going to make the inductor. This inductor is the most curious part of the circuit.This inductor is winded by a 18 - 22 gauge wire and there are four turns and the antenna is tapped at # 2 turns and the antenna is connected to the tapped wire . Initially there are Three wires coming out from the inductor .The two at the end are connected to the circuit and the middle one is connected to antenna If you are an beginner just know that a 18 gauge wire is around 1.024mm in diameter or please refer to this link:http://en.wikipedia.org/wiki/American_wire_gauge.You can use a long wire or small antenna for the antenna.You emitter is ready . Use a mobile phone FM application and check all the frequencies. You will get your frequency. I had uploaded the video .You can make 4p7 capacitor by putting capacitors in series e.g:15p :: 7p.Now you have finished making it and then you can case it so the inductor does not catch any damage i have used and angry bird MP3 player's casing.The image is given above.That's all the emitter is complete.

Step 6: Installing the Radio Moudle in Headphone

Now you are on the final step. All you have to do is install the radio module in the headphone.First , grab some thin copper wires and cut them into pieces .Then Open one side of the headphone ( Note: Different headphones have different methods of opening their cabin.) where the wire is connected to and see if there is some space in the headphone or not if so make a hole yourself.Now you will see three wire.Take you radio module and open it too.There you will find the 3.5 mm female connecter. Now solder wires on the female connecter's leads there will be three (But it may happen there will only be two leads which are connected to the circuit.)now connect them to the headphones input lead.Now keep the battery and the switch in series and pass it by through the hole for the input jack and then solder the switch (So that the power can be switched on or off from outside.) but not the battery . The battery will stay inside.Now turn the board over you will see two push-buttons not at the back you will see four leads on each of them . Now solder all the four four leads with wire. Now take two push-buttons and one on-off switch and solder it on the a small prototyping board and connect all the four leads coming out from the push button to the small push button board  you had made before very carefully and respectively but before soldering pass the wires out from the headphone ..Check all the connections very carefully . The switch on the small prototyping board is the power controller switch .Now you can also take out the positive and the negative terminal out from the battery so that it can be charged again. Now you are ready to use. Tune the headphones to the emitter's frequency by bringing the headphone close to it and scanning. If you are using a manually tunable radio module solder all the wires coming out from the variable capacitor or inductor and pass them out from the headphones from tuning it. If your radio module is not good enough you can put an antenna . For doing this there are two ways  : First if you have a pre-installed antenna  just solder a wire and put and antenna outside. Secondly if your radio module does not have and pre-installed antenna then solder the antenna at the audio out 's ground of your headphones because this ground is used and an antenna.  Here you go. Enjoy!

Step 7: Working Video

Here is the working video of the headphone.

Step 8: Authors Tip

First of all thanks for going through my instructable. If you are interested in further projects be sure to be a subscriber and please vote for me!. Now here are some basic thing you should keep in mind while using it.
  • Every time before using the headphones keep the the  Headphones close  to the emitter and then tune it (This is for those who are using the auto scan radio module).
  • Keep the volume of the emitter low to ensure good quality of sound.
  • It's better to use a rechargeable battery for the headphone or receiver.
  • Use good quality headphones.
  • You can also use a common household radio to listen to it by tuning the radio to it's frequency.
  • You can use your headphones as a radio to listen to other station.
  • Please vote for me.
  • If you have any further questions be free to ask me.
  • If there is some mistake in this instructable please inform me!
That ends the instructables,
Thanks to this website to make a place to share these projects and win and last but not the least all the viewers.
Thank you for all your work. Here in Canada's fourth or fifth largest city there are only one or two places which sell individual components. People are so used to buying ready made stuff because they give instant gratification. Experimenters order parts from the US and pc boards from Iran or India because it so much cheaper even with exhorbitant postage rates. I've experimented all my life even if my projects didn't work. I used "surplus" parts and had to learn the color codes or whatever. I also find I often have to "repair" new items due to faulty soldering from too cheap prices. In North America, very little gets fixed, just binned and sent back to where it was made. Wonderful. So it was inspiring to see your plans and work and prodded me to be less consumerist. Again than you.
Thank you too!
Glad you liked it!
Do you have a video where you put up the components? It would be really helpful
No , sorry man! I can guide you through PM if you have any problem!
<p>Hey thanks for the post!<br>I'm sure it's helped a lot of people.<br>I found this while looking for a way to do something slightly different.</p><p>I have a few bluetooth headsets, but they trap me a few feet near the computer.</p><p>Is there a way to set your computer input/output to a device in my network instead?</p><p>That would allow people to walk their whole house.</p><p>If that is even remotely doable, I'm pretty sure it a well scripted video would have a huge number of backers at kickstarter...</p>
<p>Well, as far as i know , you can add an signal power amplifier of say a watt , to the bluetooth tx/Rx of your pc. that will do the trick or increasing range. bluetooth signal amplifiers circuits can be easily ofund on any electronics website.</p>
<p>Thanks a lot for post brother.</p>
<p>other than buying a radio model,do you know how to make it(i mean on the pcb)</p>
<p>Yeah man, but you should really google it a complex one and on google you will get a variety of radio receivers in FM range which are easy to make! :)</p>
<p>cani use this &quot;https://www.youtube.com/watch?v=bZlIx4CGtX4&quot; to make the radio module? If it is wrong can u please tell me about the radio module used? </p>
<p>1. This is a bad idea cause the transmission frequency drifts frequently so you just can't tune with much with a manual tuned radio.</p><p>2. That circuit is firetruck! , these circuits are very theoretical and needs extreme precision to make , so you have to be very patient to make this and patience is not generally present in this generation's blood , so you need a different circuit.</p><p>Private message me your email and i will send you some circuits which you can built if you want!</p><p>And don't get depressed with it cause it's not that much of a thing that you fail or you're not eligible to make something but it's important to keep trying day and night without even thinking once that you can't do it.</p>
will it be possible to use my smartphone as a radio receiver?
Yeah! no matter just search your frequency by tuning! but you don't have to ask 5 times! or i think your mouse left click button is quiet loose you can put a simple paper between the switch and the upper casing button or you can change you click button!
<p>my FM transmitter is poor..what can i do?</p>
Thanx for the reply and the mouse fix. Sorry for posting it 5 times, I commented via my phone and it lagged a little, sorry about that.
No! need of sorry i faced the same problem with my mouse and it really got me suffered.
<p>my FM transmitter is poor..what can i do?</p>
<p>my FM transmitter is poor..what can i do?</p>
<p>Nice! this is really helpful!</p>
<p>You could place multiple transmitters all around your house all connected to the same audio source, all tuned at the same frequency, so you have in your whole house receive range.</p>
<p>Could you give me some video. I have a poor imagination so I can't understand your pictures. Thank you very much</p>
<p>Sorry dear but it was destroyed because of mishandling ! So i can't give a video now, i wish you had asked few weeks ago! But the video i gave is also enough to replicate it! If you have any questions even the little ones feel free to pm me!</p>
<p>What a pity . But I'll be very appreciate if you give me (and every one) a detailed instruction about the transmitter. Thank you again</p>
<p>for live instruction you can skype me or get me on facebook.</p><p>My skype user id is: sami.maman.samad</p><p>&amp; facebook is : Samadmaman Haque</p>
<p>Sorry dear but it was destroyed because of mishandling ! So i can't give a video now, i wish you had asked few weeks ago! But the video i gave is also enough to replicate it! If you have any questions even the little ones feel free to pm me!</p>
<p>If I could do this I whould make it. I Will have to cry in the corner...</p>
well it's easy for those who know electronics a little bit! in your case you could learn electronics or i have another simple way if you can buy things from ebay i can get it done by you!<br>
You could buy or search for parts all around and you will will get some of them! ut about the radio transmitter making is quiet cheap but buying will cost you around $25-30.
<p>I could buy it all by ebay. But the price will be important...</p>
does it work in stereo mod
Yes but you need to make a good FM transmitter circuit using an BA1404 IC! <br>
good work..now i'm developing a small project with headphone..better if i can add a wireless stereo connectivity to it..
Yes but you need to make a good FM transmitter circuit using an BA1404 IC! <br>
how can i change the frequency of the emitter? by changing the value of the variable capacitor? or the inductor? and lastly, do you have a circuit diagram for fm receiver? can i used this http://www.electroschematics.com/5150/tiny-fm-radio/ circuit instead of buying a radio receiver module?
Yes you can tune it by changing the value of C2 don't touch the inductor it will be messy! and the receiver circuit you gave is not very well and you will suffer a lot so i think use a BA1404 IC circuit or another IC circuit not the circuits with transistors only!
I really feel like trying, but I already have a pair of Jabra Revo wireless headphones. So maybe I should try something els;-)
Helo sir.. just wanna if i can used it in my circuit.. i have an IC that produce sound/speech to the speaker. Now i want to remove the speaker and make it wireless communication between my circuit and my headphone. it that possible? <br>should i connect the emitter to the output of the IC?
yes it is possible just name the IC and get me some images to see you speaker!And don't call me sir i am 16!
A little booster minded.
Very well! you should keep it up!
PDF won't download. <br>it comes up with the page where the pdf should be displayed, but it just gives it as 0bytes. what happened?
Yes it's the same with me! Please report to instructables Bug-Report community <br>1
I don't know i think you are not a pro member! (That's what i think)
Great innovative &quot;cut &amp; paste&quot; job !
will it be possible to use my smartphone as a radio receiver?
will it be possible to use my smartphone as a radio receiver?
will it be possible to use my smartphone as a radio receiver?

About This Instructable



Bio: I make simple! Check Out: https://www.youtube.com/user/MrMamanDon
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