Listen to audio books or music in the shop for cheap.  Folks sell fancy safety headphones with radio/electronics in them, but you can convert a normal set of headphones into musical ones for free (or under $20 if you need to buy the safety headphones/grommets.)

All you need is an existing cheap pair of protective headphones, and a scrap set of audio headphones.   I used a pair I got from Jet Blue, but any old pair you might have around will do.  You can wire the speakers into your headphones and your good to go.  The basic conversion is trivial, but   I include some tips/photos about making it look a bit more like a professional set.

Let me put a disclaimer in here.  You're modifying the protective headphones, so they may be slightly less good at hearing protection after this.  There are some small holes for wires passing though the foam/outer shell.   So this might not be a good thing to do for headphones used for super high noise levels like shooting ranges or lots of work with jet engines.  However they still seem to work very well for table saw/weed whacker level noise.

The second warning is that this adds a dangling cord to your headphones.  (Which might get pulled into machinery, etc.)   I considered putting  an 1/8" jack into the headphones and only using a patch cord to wire them into my iPod so I could have the wire out for normal use, but I discovered:
     1)  super cheap/free headphone wires are amazingly weak, so the cable is unlikely
           to pull me in it'll just break.
     2)  I can just have different protective phones around for when I do operations with
          more danger of being pulled in.

So I decided not to bother with the 1/8" jack since that was going to be more damage to the foam inside the headphones.

Alright. Enough with the disclaimers.  Lets get on to making the headphones.

Step 1: Find Some Free Headphones and Tear the Up

Here are some free Jet Blue headphones that I had in a box.  I took the earpieces apart.  You need to cut down the plastic plate they're on to make the speakers fit into the safety headphones.   I cut a very ragged line using some nippers so the parts could sort of "claw" into the foam on the inside of the protective ear pieces and not just roll around in there.  If you're speakers are small you can probably just hot glue them in or something, but it's easier if you can put them in/take them out mechanically.

Step 2: Grommets Make It Look Fancy (and Protect the Wires)

Grommets are great for running wires though holes in thin material.  They protect the wires and give the whole thing a more professional look.   You can get a pack of grommets from Radio Shack that has a bunch of sizes in it.

To drill the plastic of the headphones first drill a very small pilot hole where you want the full sized hole to go, and then drill a full sized hole.   Use a drill bit the size of the waste of the smallest grommets in the radio shack bag.  (I think about a #12 drill bit)  

Once you've drilled the full size holes, you can make putting the grommet in easier by reaming the hole a little by hand with a great big drill bit (or use a 60 deg deburring bit, etc)

Then you can push the grommet into the hole, and poke at it with a little flat bladed screwdriver until it sitting with one half on the inside and one half on the outside. Then when you're finally ready to wire you can just push the wires though the center hole of the grommet.

You can use a bit of dish soap if they're a tight fit.

Step 3: Running a Wire From One Headphone to the Other

You'll need one shielded wire that passes from one side of the headphones to the other.  I could have gone with the original wires of the audio phones, but I had some 1/8" shielded wire around and it seemed like it'd be nice to use beefier wire for this run.  You use shielded wire so you don't end up hearing a lot of buzz and wherr from electrical noise from the tools you're using.

This turned out to be by far the hardest part of the project.  But only because I decided to make it hard on myself.   If you have headphones like the 3M ones that just have a solid plastic band that goes from one ear to the other I recommend just drilling some 1/8" holes along the band, and snaking the wire up/down though those holes to keep it out of the way and tidy.  

The headphones I had were more complicated.  They had a two springy steel wires that went between the sides, with a padded plastic band at the top for your head.  The wires passed though this thing, and I decided to pass my wire though as well.  This turned into about 30 mins of soaped wire and deep tissue massage to get that wire to behave and come out the other side. 

It looks nice, but really was not worth it.  If you have a small stainless wire or something you could thread that through, and use it to pull the shielded wire though that might work better, but really it wasn't worth it.   I probably should have just converted my 3M headphones instead, a few drilled holes and some threading would have been much less frustrating. 

Don't be tempted to use gaffers tape or something for this step since your hair is up there and you really don't want something sticky providing depilatory services while you're wearing these things.   Also remember to leave enough slack in the wires so they can be adjusted to their biggest setting and also have the ear pieces tilted out to their normal position when in use.

Step 4: Solder the Wires and You're Done

Ok, next you need to solder the wires back to the speakers.

Here you can see the 1/8" shielded wire just before I tinned it and soldered it to the speaker. The normal wires for the headphones are TINY.   They each of 1 strand of hair like wire that has the signal, and a small set of bare strands that are the shield.

So the wiring goes something like this:

One headphone has 1 grommeted hole at the top, the other has one at the top and bottom.  The two top holes are where the 1/8" wire passes between the two sides.   The extra hole at the bottom is where the last dual wire from the original audio phones goes out to the 1/8" stereo jack and on to your audio device.

When you push the 1/8" shielded wire though the upper grommeted hole, poke it through the foam on the inside so it comes out in the "main chamber" of the headphone.  You might need to use a nail or a piece of thick wire to do this.

Once you pass the dual wire though that bottom grommeted hole, tie a knot in it to keep it from easily pulling out.   When I went to pull the knot tight I broke the wire!   Crazy.  Those tiny copper wires + little bit of plastic means this dual wire is pretty weak.  This provides a measure of safety, but also means they're not going to hold up for ever.   So pull the knot tight very gingerly.   Then pass it though the foam into the "main chamber" just like the other wires.

Split/strip the dual wire into two sets.  One with the tiny red wire and shield wires, and the other with the tiny blue wire and shield.

Solder one of these to the 1/8" shielded wire to travel over to the other speaker.  I did this and the electrical taped the two wire together and put a 1/2" of heat shrink tubing over the whole thing to make sure there wouldn't be any strain on those hair like wire.

When soldering to the speakers be aware that there are 2 tiny hair like wires going from those pads to the coil of the speaker itself.  Make sure they stay submerged in solder.  When I when to test my wiring one of the speakers was dead and I tracked it down to one of those wires having popped out of the pool of solder while I was soldering down the big 1/8" shielded wire.

The other side of the original dual wire can go directly to the speaker on that side.   You can tin the single hairlike signal wire to make sure you've burned of the insulation that's on it.   Be quick when you solder the shield wires so they don't overhead the insulation on the signal wire and short to that.    If those wires pass though the air for a bit the part that's actually touching the signal wire stays cooler, so make sure they aren't soldered up super close to the other wires.

Once you have things wired, but before you stuff it all into the safey headphones it's nice to test things out.   If you have a meter you should read something like 30 Ohms between the shield on the 1/8" jack and the tip/first ring (which go to each of the speakers).  

If you measure between the tip and first ring it should read double what the other reading was. 

If you don't have a meter you can always hook up an audio device and see if you hear something coming from each speaker.

Step 5:

Now all you have to do is gingerly fold the wires under and push the speakers down into the foam of the headphones.   You have to be careful not to over stress the thin wires on the side where the original audio wire goes back directly to the speaker since it's only few hairs worth of copper and it's semi easy to break.  

Once you've got the speakers bedded down in the foam enough that they don't press on your ears, you should be ready to enjoy listening to music/audio books in a noise environment.

My headphones are a bit soft. I now have to crank the volume a bit higher then normal to get a normal listening volume.  I think that's because they're not pressed right against my ears any more.   Still they work well and because of the level of noise isolation the safety phones give me the whole thing works a treat.  Enjoy!
Yeah so what you mite do about getting the cord out of the way is run it though your clothes. It mite not feel so nice but it's better then getting your cord ripped out or your "headphones" tore up.
i put a 1/4 inch stereo jack in mine so I could plug a stereo line from my sound board directly into the headphones. i will post pictures shortly.
Cool! Thanks for posting about it. I like hearing from folks when they build variations on this theme! Post some pics!
Why not wear earbuds and then put on the safety ear muffs over them? When I was training to become a private pilot back in the 1980s I did this so I could listen to music during the solo cross-country flights.
Ja, that's what I did a few years ago when I was building a deck. It does work reasonably well, but there's some small annoyance with jockying wires, earbuds pulling out when I'm putting the headphones on, etc. (and I'm not a huge fan of ear bud style in general, but that's just me) Heck you can even go the other way around (put ear plugs in under your audio headphones, and then turn the volume up a bunch.) I just built these since it's a bit more comfortable, and then I only have to track down one thing when I'm trying to listen and get work done.
my friend gave me a broken pair of sony headphones, but the only thing that was broken was the headband, so i decided to do this. after putting the speakers inside the headphones, i realized that even at full volume, it was still pretty quiet. i'm assuming the foam inside the headphones absorbed a lot of the sound. not only that, but the cord running out of the headphones created a very tiny crack that let in a surprising amount of outside noise. i probably could have sealed the crack or drill a hole in the case, but either way, the noise canceling wouldnt be as effective as it was to begin with. i was pretty disappointed, so i took them apart and returned the headphones. oh by the way, my intention was to make a pair of noise canceling headphones, like kipkay, and not to make it so i can listen to music while wearing ear protection.
That's a good cautionary tale. I can't tell (by ear) that my safety headphones are operating any less well. I'd guess they're still operating at least 90% as well as they did originally (because I was careful about running the wires and making sure I wasn't introducing any gaps, etc.) I think the number one loss of volume comes from increased distance to the ear. I positioned the speakers so they're still very close to the ear, just not quite touching. I did that so that they wouldn't be getting pressed mechanically every time you put the headphones on. But you still want them very close to the ear. Any increased distance means more audio going into the foam and less into your ear. Although my rig is a bit quieter I can still make it too loud, so I have enough headroom. I think with normal headphones I usually have the volume at about 1/4, and with these I have to turn it up to about 2/3.
air pressure is why they are quieter
it lok very usefull
Good job!
Funny... I made a pair tonight while watching TV.... need to find my soldering iron though then I can put the end back on...

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