Instructables

DIY bluetooth receiver for any amplifiers under 3$

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Picture of DIY bluetooth receiver for any amplifiers under 3$
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Today I found some old Bluetooth mono headset its kinda useless for me since you know it looks weird when you are wearing it so I tried repurposing it now lets see what can I do with something with bluetooth and audio capabilities.... Well the first thing that came up in my mind was another BT boombox or amp, we all know thats common here so I tried something new and much simpler!....

STREAM your music on any Amplifier via Bluetooth. its that simple and I asure you It wont even cost 4$+ well unless you buy a mono headset. which is something like 10-40$,but any ways let me show you the things you will need

PARTS

A 3.5mm JACK or a 6.5mm guitar amp jack 1-2$

Some thin wires like 28 AWG wires

And the important part the BT mono headset.

TOOLS

Soldering Iron

LEAD

WIRE stripper

HOT GLUE

Long nose

Step 1: BT module

Picture of BT module
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ok lets start off by choosing your Bt mono headset, lets say you have one already, but wait does it sound nice? try testing it by putting it on your ear and try listening to some music...Go to the last step on how to do this....If the sound is acceptable then feel free to continue reading this guide and if not might as well make one I mean who uses these bluetooth mono headsets right :D

You can recycle other Bluetooth modules from other audio devices that you are not using. Example like those bluetooth speakers, fake bluetooth headphones there are dozens of them to recycle and repurpose its just this is the only Bt module I have lying around here

~TIP~ RECYCLING 2CH. Bluetooth HEADSET is better when it comes to sound quality

Step 2: OK disassemble that useless headset

Picture of OK disassemble that useless headset
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Most BT mono headsets have no screws to disassemble the whole thing so look for the grooves on that edges and that is where we will start

1. Look for the grooves that is obviously the cover of the device

2. options to open it up 1st is a cutter slide through the small spaces and make your way to open it 2nd Is just use a long nose then just forcefully remove the cover.

Step 3: Know the connections going on

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Believe it or not this I really easy Bluetooth aint that hard I mean the PCB is already labeled so dont worry when you get lost in the connections just make sure you know where is the + and negatives known as common ground

1. Look what inside the device and see if you can do something about it.

2. Get a picture of the connections just like mine to have a reference.

3. Know where is the charger connection, Audio connection, and battery connection

Step 4: Time to remove the small speaker

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Ok now that you know the connections on the PCB time to replace the small speaker with a JACK for my purposes I used a 6.5mm the ones used for guitar amplifiers.

1. from the title itself remove the small speaker

2. Cut the wires from the speaker leading to the BT PCB.

3. Once done you should be able to remove the speaker and its cap freely with out destroying the PCB

Step 5: Solder some wires

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Now set aside the device and lets go to the plug

at the end of my RCA to 6.5 I soldered the + or red wire inside and then the Ground or black wire onto the exterior side or the RCA

1. Solder things properly

2. Get the other part of the casing and see if it fits just like mine

3. Using the gluegun apply some near the ends or the RCA plug to secure it on the old mini speaker hole.

Step 6: Nice and stable

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Basically All we need to do here now is to solder the wires onto the correct terminals on the PCB

ground to ground

Audio to audio terminal

just follow the block diagram and you will be fine come on this is super simple.

Step 7: PUT everything back

Now that you are done soldering things in place its time to put thing back together.

1. From the pictures you've taken put the battery the same way it was before and do for all the wires and PCB :D

2 Get the top cover and put it back then you are done the only thing left now is to teach you how to connect BT mono headset to your phone and play musics on it.

Step 8: ANDROID APP & APPLE

Picture of ANDROID APP & APPLE
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Download the APP BTmono from the android app store and then install it on your phone.

1. Turn on your phones BT and as well as the thing you made.

2. Open the app you just downloaded

3. After opening it you will immediately know what to do :D ...press the on button.

4. Once done you should now be able to play music via BT.

5. Common sense here umm. to test the thing out connect the module onto your amp.

6. Play your music on the phone ...do not use stock music player on a samsung phone it wont work better use the other app in color orange :D

7. Listen, tune the tone and then enjoy :D

VIDEO INSTRUCTIONS I DO NOT OWN "credits to them"

ANDROID

APPLE

 
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D4VIDLE1 month ago

will this work for a car aux jack?

treyes4 (author)  D4VIDLE1 month ago

It should just make sure the bluetooth module you are using has a 2ch output so that you can enjoy the music.

tychobot2 months ago
awesom
Vitim2 months ago

For this you want to use a bluetooth that have the AD2P profile, that can stream 48KHz Stereo up to 396Kbps. These headsets that have only HSP or HFP profiles are no suitable for music just voice, they are limited to a 8Khz narrow band , it will sound like a old telephone line.

treyes4 (author)  Vitim2 months ago

welp yeah I realized that then I tried experimenting with other bluetooth modules "2ch audio BT rx" work best

Constructed3 months ago

Well this is awesome...

Mr_Bean3 months ago

Nice work! May be exists like this on Arduino?

poljacs3 months ago

bangis!!! lupit nito boss

jetpower3 months ago

Really nice work! One question: Wireless devices are notorious for replacing the warm (low-fi) sound of a guitar cord with crystal clear but gutless tone. Bluetooth headsets, at least where I've heard them, tend to bring their own brand of digital distortion to the party.

With all this in mind, how would you describe the general sound of this rig compared to that of a plain ol' guitar cord?

treyes4 (author)  jetpower3 months ago

the normal cord is still better compared to the bluetooth in so many ways, I would say the sound lacks base but its probably because of the mono Bt headset its like listening to only one earphone. I tried disassembling my old Bluetooth boombox and tried using a 2ch output BT module and guess what it does sound better!

jcook20 jetpower3 months ago

I have what would be considered a high end bluetooth receiver specifically designed for amps and I can tell you right now it still sounds gutless. The issue lies in the compression. Bluetooth is convenient but you will lose fidelity and range and that needs to be reconstructed as best you can by post-EQing it, which will lead to further loss of quality.

If you don't mind a bit of distortion through your guitar amp then cool. If you want to hear a whole track as it sounds with just a cable, then bluetooth isn't the solution for you.

Joefer jcook203 months ago

Did you make it yourself or purchase it? May I know the BT version of your receiver ser? Just curious,.

jcook20 Joefer3 months ago

I didn't make it. I tried finding it online again the other day for a friend. No luck. It wasn't all that expensive as there isn't really a way to make bluetooth more expensive or perform better. It was probably version 4.

Joefer jcook203 months ago

Much obliged!

jcook20 jcook203 months ago

I take it back, I found it and it's actually shitty bluetooth 2.0.
http://www.dx.com/p/bt-au01-wireless-bluetooth-v2-...
I'm definitely finding a v4.1 replacement.

Joefer3 months ago

I actually managed to build an almost similar project 8 months ago. I used a BT speaker. I was able to make a 'REVERSIBLE version' - I could choose between operating it is a BT receiver and utilizing it's built-in speakers back as a BT speaker. Also, instead of using a 6.5mm jack, I used 3.5mm (femaIe/port) to solder to the device so as to make use of the (I think) better sound that RCA cables produce. I can't elaborate more on the specifics as I am no engineering expert (sorry ^^). An issue i find though is that there was a LOT of static noise on standby and that the sound begins tinny halfway of my AVR's max volume. I believe this BTmono app which the author suggested could help. I'll try as soon as I get home tonight.

SciFiJim3 months ago

Is there a way to turn this around and have the input come from the plug and be broadcast via bluetooth? I am thinking of being able to eliminate cables from instruments that output readings on a cable (ie. remote thermometer, chronograph, etc.)?

muddu1 SciFiJim3 months ago

you could just connect the plug(input)to the mic of the bluetooth headset

treyes4 (author)  SciFiJim3 months ago

Ow that well im currently trying to do that and looks like you will need to reprogram the Bluetooth module for it to happen

cdvignali3 months ago
Would you be able to use this to connect to a phone to play music in a car, etc.?
DannyBZ4 months ago

I have a BT headset that I don't use, is it possible to channel both Left and Right signals through two phono outputs?

treyes4 (author)  DannyBZ4 months ago
yup just connect left and right
Ian11487 DannyBZ4 months ago

you should be able to

craftzrulesO4 months ago

This looks great!

Naren_Murali4 months ago

great idea man!!!! it'll be perfect for jamming to some songs with an electric guitar!!!!

treyes4 (author)  Naren_Murali4 months ago

Btw I suggest using a good bluetooth mono headset if you are going to jam with a guitar I'll update the guide on which bluetooth module is fit for this project

thanks!! please do!

fozzy134 months ago

I thought about doing a project like this a year or so ago, because Bluetooth is awesome. I found that for the same or less price of a cheap Bluetooth headset, you can buy a Bluetooth adapter to plug into your amplifier or speaker of choice. Great idea if you have one laying around that you won't use though.

kbc24 months ago
awesome, since i have audio devices that have jack input but no BT. Even looks eady enough for a electric beginer like me to start with.
dmagryta1244 months ago

I just built one of these a few weeks ago. I was going to post an instructables tutorial but I see you beat me to it haha. Great minds think alike in this case, eh?

bergerab4 months ago

Wow, this is awesome. You've earned a favorite from me! I'm totally going to do this, thanks for the knowledge!

treyes4 (author)  bergerab4 months ago
you're welcome :D
caitlinsdad4 months ago

Is the output of the bluetooth device too hot or line level? (Does it blow up the guitar amp speakers or you get distorted sounds if the amp is turned up too high?)

treyes4 (author)  caitlinsdad4 months ago

Hello there caitlinsdad there are no problems in terms of the bluetooth output and the amp speaker burning down. For the sounds getting distorted at max volume I dont really know cuz thing is to loud