In this project I will show you how I "fused" a dirt cheap bluetooth music receiver with an old speaker of mine. The main focus will be on designing a low cost audio amplifier circuit around the LM386 and the NE5534. The bluetooth receiver costs 4,5$ and the audio amp 3$. So you can call this low budget.

Step 1: Watch the Video!

The video gives you all the info you need to build this project. But in the next steps I will present you my part list and my schematics to make things easier.

Step 2: Get the Bluetooth Receiver And/or Your Premade Amp!

No matter which circuit you want to build, you will need at least the receiver. Here is where I got mine from:

Bluetooth music receiver:




And if you do not want to build the amp circuit by yourself, you can always buy a premade kit. Here is a nice one:

Premade Amp:




Step 3: Order Your Parts for the Circuit!

Now it is time to order the parts for your circuit. Here is a list of what you will need and where you can buy it:

LM386 Circuit:



1x470µF Capacitor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x2200µF Capacitor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1x100nF Capacitor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xIC Socket: http://rover.ebay.com/rover/1/711-53200-19255-0/1?...



1x470µF Capacitor:http://amzn.to/1nW0tlX

1x2200µF (1000µF also works) Capacitor:http://amzn.to/1nW0tlX

1x100nF Capacitor:http://amzn.to/1G29rnq

1xIC Socket:http://amzn.to/1tHInou



1x470µF Capacitor:http://amzn.to/109LhXc

1x2200µF Capacitor:http://amzn.to/109LhXc

1x100nF Capacitor:http://amzn.to/1q8dftp

1xIC Socket:http://amzn.to/107M7UA

NE5534 Circuit:



3x100nF Capacitor, 1x22nF Capacitor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

2x470µF Capacitor, 1x2200µF Capacitor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xBC637 NPN Transistor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xBC640 PNP Transistor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

3x100k Resistor, 1x10k Resistor, 1x100 Resistor, 1x47 Resistor:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xIC Socket:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...

1xSilvered copper wire:http://rover.ebay.com/rover/1/711-53200-19255-0/1?...


1xNE5534: -

3x100nF Capacitor, 1x22nF Capacitor:http://amzn.to/1G29rnq

2x470µF Capacitor, 1x2200µF Capacitor:http://amzn.to/1nW0tlX

1xBC637 NPN Transistor: -

1xBC640 PNP Transistor: -

3x100k Resistor, 1x10k Resistor, 1x100 Resistor, 1x47 Resistor:http://amzn.to/1tp60Rh

1xIC Socket:http://amzn.to/1tHInou

1xSilvered copper wire:http://amzn.to/1E8p1fy



3x100nF Capacitor, 1x22nF Capacitor:http://amzn.to/1q8dftp

2x470µF Capacitor, 1x2200µF Capacitor:http://amzn.to/109LhXc

1xBC637 NPN Transistor: -

1xBC640 PNP Transistor: -

3x100k Resistor, 1x10k Resistor, 1x100 Resistor, 1x47 Resistor:http://amzn.to/1sQMyZV

1xIC Socket:http://amzn.to/107M7UA

1xSilvered copper wire: -

Step 4: Build Your Circuit!

Here you can find the schematic for the LM386 and the NE5534. You can also use the board design that I made. I used this as well and it works perfectly fine.

Step 5: Success!

You did it. Now you can enjoy the awesome music of your homemade audio amp .
Feel free to check out my Youtube channel for more awesome projects:


You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information.



Hey i really want to build this but i have a problem i need my speaker to be loud so i wonder is it loud sorry my english is not very good
By the way i am going to use the lm5534 circuit
<p>I made Lm386 circuit and it worked but has too much noise.. So I started making Ne5534 circuit but Can't get it to work.... I changed all the components. I think there is some problem in the output stage..</p>
<p>hi, i have made a bluetooth speaker but the problem is that i get distortions because it is connected to the same powersource. the speaker i made is supposed to be portable and it would be inpractible to use 2 different batteries. is there any way i coud solve this problem? thanks in advance</p>
I have got the same problem did you fix it
I bought a simple ground loop isolator and that fixed the problem.<br>
<p>would something like this work http://www.ebay.com/itm/Mpow-Ground-Loop-Noise-Isolator-Car-Audio-System-Home-Stereo-With-3-5mm-Cable-/152095915411?hash=item23699f7d93:g:yEsAAOSwXSJXPVsY ?</p>
<p>I think it will work but I am not 100% sure, I used a similar ground loop isolator like this one from e-bay: <b>http://tinyurl.com/jgnffk7</b></p>
Same problem
<p>where i can get the 12v power supply?</p>
<p>Which is the program you used to make the layouts for the pcbs?</p>
<p>can i use a 10 watt speaker plz replay me i am doing this experiment as my project </p>
<p>I made it!!</p>
<p>can i use NPN,30V,1A,1W transistor instead of NPN,60V,1A,1W</p><p>and any alternative for the op amp (ne5534)</p>
<p>hi! can i use an lm741 op-amp instead of lm386 without disarranging the schematic or without changing the connections? does it matter or not?</p>
<p>You can check the datasheets of them. </p>
<p>Iv done everything right and my amp works but i still get distortion once i get to a decent volume, not sure why either. Im using the NE5534AP circuit</p>
<p>Hi, please can i add more voltage, when i use bigger capacitators/more input voltage - or i dont know. Thank you nice tutorial (but for me small volume in output reproductor)</p>
<p>Hi, thanks for sharing. I'm trying to build it, with no lucky.</p><p>Since I notice some divergences between the schematic and the board design, I decided to follow the schematic, but it doesn't work too. I built it several times, but the result is always the same, nothing happens.</p><p>Could you, or anyone that had built it successfully, confirm the schematic is right?</p><p>I'm assuming that the project has something wrong because, among others in the schematic C1 is a 2200uF capacitor and C2 is a 100nF capacitor. And they don't share direct connections. Into the board design, C1 and C2 seems to be equals and they share same connections...</p><p>Trying to find what was wrong, I suppose that, in the board design, C1 and C2 are actually C4 and C5 (because they are both 470uF capacitors, and they share connections)...<br> </p><p>So, which instructions should I follow? Each one is the correct?</p><p>The project is great, and I'm really interested in it. Thank you very much for your time and patience.</p>
<p>I fixed the problem</p>
mau coba tapi komponennya susah dapet..
<p>i have 2 question</p><p>1.where should i need to connect r3 and whats the value of r3</p><p>2.what happen when i connet h162 model bluetooth</p>
<p>Very innovative.</p>
<p>Nice project and excellent presentation! </p><p>It's been a while since I started considering building my own mobile bluetooth audio receiver, so I could make any earphones/headphones wireless. I had already had the exact same bluetooth module as the one you use in your project laying around and I only use it with a pair of 60W speakers for movies. The results where just fine and the sound seemed flawless. </p><p>But when I tried to pull in my headphones I could clearly notice some sound distortion and a constant buzzing noise in the background. I knew that I got a really cheap deal with this receiver, but I thought that only that specific piece would have this issue, so I ordered a new one. Still the same though... </p><p>Have you any idea how I could enhance the sound quality of this receiver? I have everything else sorted out (lithium battery, power supply, connections, etc.) and this is the only thing that needs to be fixed right now.</p><p>Thank you in advance,</p><p>Sotiris</p>
<p>Hi, I have sold this problem on my circuit that it was the same as yours.</p><p>You need to put more capacitor as C5 and put out C6. I have got for C4=2200uF,C5=470uF,C6=470uF and add one more C7=1000uF.</p><p>In my circuit works beter.Best audio toturial :)</p><p>M.G. ELECTRONIC</p>
<p>You have inspired me to use these Bluetooth adapters to fix some of the problems in my own life. I bought one the other day on amazon and i plan to add it to the little iPod speaker dock we have that doesn't get used to breathe some new life back into it. I may buy another one or many if i can use it to fix some other issues with phone audio not going through my DIY auxiliary/fm port.</p>
<p>Sorry for that poor translation. Problem with translator app.</p><p>I've been watching the movie again with headphone this time to avoid the ambient noises (I'm always surrounded by my daughters) and I understood pretty much everything now.</p><p> I will only follow the instructions for the NE5534. I like your breadboard protyping model. Where did you found it?</p>
<p>Hello, very nice project! I am about to reproduce but I must admit that I do not understand all. For example, do I have to follow all the steps or if I want to, I can follow the steps 1 and 2? If I buy the pre-amp, should I continue and complete the following steps? Do I have to order all the parts you mentioned? LM386 or NE5534 or both? </p><p>Is there a possibility to add another audio source that already has its power source? What I'm trying to say is that my workplace there is a speaker that I could change one by adding a Bluetooth device but I do not have to unplug my employer not noticing but I was able listen to music of my choice when it is not there.</p>
Depends on what you want to spend. If you purchase a player that can connect to a network, it's easy. You might already own a game station that can double as an entertainment center. We have a PS3 that we bought for gaming because it has a blue ray player built in (two birds with one stone). It also can access and play pretty much anything from a home media server.<br>Purchase a wireless router for your home. Your laptop has the ability to run a media server, believe it or not. You just need to leave it on all the time. The PS3 or whatever you have should find the computer with all the songs on it and you can select music or movies to play from that. If you want to put movies on it as well, get a really large network hard drive and rip your favorites to it. Connect it to your router and the media server will read from it and the PS3 (or whatever you buy) will be able to play them as well. Not the cheapest or the coolest setup, but it works perfectly well and is easy to set up.
<p>NIce, thank you. Given your apparent expertise in this area, I thought to ask if you knew of a project that would help me solve my (non-Blue Tooth) problem with my CD music collection. The 250 CD Player is not so good as when new - while I have no complaints about the amplifier and speakers when the Player is performing well.</p><p>What I would like to find is an instructable that would explain how I might efficiently transition my music collection to a digital device that would provide the same functionality as my 250-CD player and simply 'plug-in' to my existing amplifier and attached speakers allowing me to randomly play all the individual selections randomly (once I'd somehow converted them from the CDs to the 'new' device).</p><p>I'd as soon purchase something &quot;off the shelf&quot; as build it given my lack of success in constructing circuit boards with my Weller soldering guns.</p><p>Any feedback will be appreciated.</p>
<p>Do a search for &quot;Media Server&quot;. You'll need to make sure your player has network access to connect to it then you'll have to spend a lot of time ripping your cds to the hard drive.</p>
<p>&quot;Network Access&quot; is a bug hurdle as mine is via dial-up. Is there nothing ;plug and play. out there? I can 'rip' the tunes on my laptop - right?</p><p>I can hook up my little MPS Player, but would rather have controls similar to those on the regular equipment with a display panel and maybe a remote control.</p>
<p>Awesome! Which software did you use to design the board?</p>
<p>It is called &quot;Lochmaster&quot;. I am not sure whether it is available in english though. Here is the link: http://www.abacom-online.de/uk/default.html</p>
<p><a href="http://blackboard.serverpool.org/" rel="nofollow">http://blackboard.serverpool.org/</a><br><br>Don't know if its the same, but this ones pretty good.</p>
<p>I'll just leave a comment here to know the answer too :D</p>
<p>Best audio toturial :)</p>
<p>Awesome gadget! I love that you let us in on your mistakes, it's so helpful for people that are learning, but it takes a brave soul to share them.</p>

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