Let's turn it up to 11. Hey gang Tim here at Core Electronics, and today we are making a 10 watt Bluetooth stereo speaker with this a Bluetooth 4.2 audio receiver port the mhm38, and we're doing it with absolutely zero code so let's get started.

The end goal here is to have a formidable new SP powered plug and play boombox and a full understanding of all the electronic components the mhm38 module is a Bluetooth audio receiver with stereo amp and two loudspeaker outputs when powered it can play music From a smartphone wirelessly or via a computer through USB data these tiny boards pack a huge punch letting you drive two 5 watt speakers very loudly and doing so with a connectivity range of over 20 meters that's like 10 times further than here for more knowledge on these boards come check the full write-up link down below on the table before me is everything you're going to need you're going to need that Bluetooth audio receiver module you're going to want two enclosed speakers and a micro USB To USB cord naturally you're going to need a powered location to plug the USB end into if you take a look at the Bluetooth product page you can see a great schematic to follow through with there are multiple options when it comes to powering this setup, know that you're also going to need to solder some connectors together so soldering equipment is a must you can minimize the amount of soldering required with a universal crimping pliers and JST-PH two pin connectors when you have the Bluetooth module In hand and unboxed you're going to be presented with everything you can see right here the first step is to solder these two female connectors straight to the module if you prefer you could also just solder wires directly to this board, use flux and blue tack to make this process easier

with that complete we can now turn our attention to connecting our two speakers make sure to use heat shrink and slip it over the wire before making the connection twist the wires together solder the speakers red To blue positive and black to yellow ground this is a bit of a hack but know that you can use the middle of the soldering iron to shrink the heat shrink once all connections are made your hardware should look a lot like this it's a good time to note here the output of the two power amplifiers cannot be connected in parallel and cannot have the two negative poles connected together if you were to do this the modules onboard power amplifier chip is going to be damaged if you only wanted a mono speaker Check the description I have a Bluetooth receiver board down there which is perfect for you at this point simply connect up your hardware with a micro USB port that is powered the power can come from a USB charger a computer's USB port or literally anything that can supply stable current to the system it's going to make a nice noise indicating that it's ready to be paired with our Bluetooth device when unpaired the blue indicator light is going to flash quickly when a Bluetooth device is connected The indicator light will stay on lastly when Bluetooth audio is playing the indicator LED is going to flash slowly so let's pull out our phone and open up the Bluetooth settings inside it start by turning on Bluetooth connectivity you'll then see the mhm38 board right there click on it and your board will respond with a nice little sound bite nice as you can see we have now paired our device and the LED light is solid now that our system has been paired if you try to search for this Bluetooth module With a different phone you're not going to be able to find it not until you disable your connection here so with all connected and wired up and ready to go it's time to put our system to the test, open up your favorite YouTube video and check it out. wow, that was pretty intense all right that was really loud so as you can see you can control the volume directly from your phone now this is also a good place to mention this module does not have any input or output options for auxiliary headphone Ports it also does not have the capability to easily add user interface buttons like sound up volume or mute all the audio control is managed by your phone or the connected computer if you do want all these features I have a Bluetooth module for you linked down below naturally I had to make a boombox for the system, so I whipped one up in fusion 360. 3D-printed in PLA laser cut back to it and assembled it without this case the speakers vibrate very intensely, particularly on flat surfaces when playing Loudly a case like this will prevent that and improve your audio fidelity watch my speed run of the build process right now if this USB boom box takes your fancy feel free to download it and print it to all the files are in the main article link in the description and if you don't have a 3D-printer or laser cutter or if you just simply prefer to build in a different medium than do that I have seen some amazing boom boxes being made from modified cigar boxes and even better ones from wood stone Or PVC pipes there's nothing cooler than making your own unique build

shall we turn it on and hear what it sounds like I think we should, I'll do that I'll do it, and it gets louder than that, and I'm just too shy to make it loud right now there's too many people being busy making sure that the orders get to your door at the moment this device isn't portable so as soon as I take this out it's going to turn off if you wanted to fill this with some lip batteries this Bluetooth module is still a perfect Option check out the article for exactly the pieces you need because I've explained it fully right there with it correctly wired up any 3.7 volt lipo battery could be utilized safely with this extra component tree we could even make this switch on the top do something other than just look pretty hell we could even add some audio reactive LEDs inside as well so take full advantage of the fact that the back is transparent that'd be really cool the aspect of case building is so enjoyable for electronics It's perfect for a DNT program for a school or just a weekend craft project I just want everyone to know the electronic aspect of this can be dirt quick and easy to sort there's no code, and basically its simple plug and play and truly a 10 watt speaker can really pack some noise so until next time stay cozy