Jul 22nd, 2019 | by: Rick Sanchez | Views 3166
Views 3166
Around 2 years back I've made a huge portable Bluetooth speaker but that had some errors with the circuit. Then, I've made a small portable bluetooth speaker that had a good circuit. Now, I'me making a new version for the big speaker but with all the errors corrected. It will have a 6S battery pack with good capacity. It will have a 320W amplifier, an on/off switch, a paring button, a volume potentiometer and the battery pack will also have a 6S BMS protection and charging circuit. In this way we can charge back the battery. And to know when it's low, the speaker will have a small voltage meter with a 7 segment display. Let's start...
The battery pack

Ok, for this tutorial you have the full part list below. But first, we need our battery pack. I had a few of those 18650 batteries from an old laptop and some new ones as well. I will use 12 of these batteries. I will make pairs of 2 batteries in parallel and then I will put 6 of these packs in series and get 6S battery pack.


Parts we need
Battery pack

As you can see below, I've used those plastic supports made for this kind of battery pack. Those are very easy to use and you can give them any shape. Just join them together with the amount that you need. In my case I need 6 supports for the bottom part and 6 more for the top part. Then I place a parallel pack with positive side upwards, then the enxt pack with negative upwards and so on. I use my spot welder to join the parts as in the schematic below. Then I solder the 6S BMS module as below in the schematic as well and the battery pack is ready.

DIY Battery pack

Now we have out battery pack of 6S of 25.2V and in my case, using 3000mAh battery and 2 in parallel, with a total capcity of 6000mAh. This will be good enough for this project. Is now time to connect this to the rest of the circuit that you will find in the next part. So let's see...


BMS connection

The schematic is quite simple. Between the battery and the rest of the circuit we have a ON/OFF switch. So we connect the positive side of the battery to that switch and the switch is connected to 3 things: to the amplifier positive input, to the positive input of the small buck converter and to the input of the voltage meter. That buck converter is used to lower the voltage from 25V to 4.2V for the Bluetooth module.


So, as you can see above in the schematic, we don't have much connections. Connect the R, AGND and and L from the Bluetooth audio module to the inputs of the amplifier. Connect one or both outputs of the amplifier to your speakers and make sure the speakers are powerful enough. Solder the input connector to the battery. The battery has a BMS as seen before so it will get charged and balanced if we apply exactly 25.2V to the main input. We can see when to charge the battery on the voltage indicator connected after the ON/OFF switch. For the volume potentiometer I've desoldered the potentiometer the amplifier had and solder it back in the same way but using long thin wires. Also, important , make sure you set the small buck converter to 4,2V before you connect that to the BT module, otherwise you might burn it. And that's it.


Mount it all 1

Now I first make the connections in the schematic outside the wood case in order to make sure it works. Any way, I make 2 holes on top of the case and place the on/off switch (red one) and the paring switch (blue button). I first solder long wires to those and then connect them to the circuit. Then I make another hole and place the battery indicator and connect that to the switch. I place the battery inside the case with screws.

Add the parts
Mount it all 2

Finally I desolder the volume potentiometer and solder it back using long wires. I make another hole on the side of the other two buttons and place the volume potentiometer with a plastic knob as well. Then I screw the amplifier inside the case and fit all the wires. I connect the speakers and I can now screw back the speakers and add the plastic covers and the project is done...

Close the case

Finally, now that everything is inside I power it on and I can see the battery level. If the battery is low just use your power supply set to 25.2V and chare the battery. I press the paring button and after the beep I turn on Bluetooth on my smartphone and connect to the module and play music. It works great...


  • Noob 19129

    about 8 months ago

    Please try Google before asking about Updated Product Site 023d94c

    Noob 19129

    about 5 months ago

    Please try urlhttpswwwgooglecomGoogleurl before asking about urlhttpswwwparadisifiscalieuthreads96477Helpwritingaessayforcollegep292488post292488New Product Guideurl a705798

    Noob 19129

    about 5 months ago

    Please try urlhttpswwwgooglecomGoogleurl before asking about urlhttpsmq64orgphpBB3viewtopicphpp179246p179246Cool Product Siteurl 798859

    Noob 19129

    about 5 months ago

    Please try urlhttpswwwgooglecomGoogleurl before asking about urlhttpsbiomedtalkorgshowthreadphptid8147pid32284pid32284Cool Product Tipsurl 057983

    Noob 19129

    about 4 months ago

    Please try urlhttpswwwgooglecomGoogleurl before asking about urlhttpwwwyabsyoncomviewthreadphptid1654147pid6688017page1extrapid6688017New Product Websiteurl 057984

    Noob 19129

    about 3 months ago

    Please try urlhttpswwwgooglecomGoogleurl before asking about urlhttpwwwsvenska480klubbenseforum1viewtopicphpp23097p23097Useful Product Tipsurl 981595

    Noob 19129

    about 2 months ago

    Please try urlhttpswwwgooglecomGoogleurl before asking about urlhttpsforumquillmanecomviewtopicphpp258498p258498Cool Product Tipsurl 79e0b59

    Noob 19129

    about 1 month ago

    Please try urlhttpswwwgooglecomGoogleurl before asking about urlhttpswwwtracingequinescoukforumviewtopicphpp42589p42589Best Product Infourl f6c4aa0

    Noob 19129

    about 1 month ago

    To the lady talking about fr clothing go clothing store designer fashion store for you store clothes decor believe clothing store clothing designer your clothes this clothing store clothing unique I highly recommend this urlhttpscameron5x44tdb1ourabilitywikicomuserhigh rated fashion simulator infourl or new cloth store clothing designer store clothes clothing cloth fashion store your clothing brand we are clothing brand clothing starting with a fashion for fashion unique clothing store fashion clothing and dont forget this urlhttpsautofileorgmemberphpactionprofileuid938078see page for clothing store simulator adviceurl and dont forget accessories fashion q clothes store perfect clothing store fashion clothing brand here the store womens boutique in touch clothing home brand clothing clothing at home touch clothing alongside all this urlhttpsjonathan8t86xxm5dailyhitblogcomprofilepublished here about simulator detailsurl which is also great Also have a look at this urlhttpsindexedbookmarkscomstory17073712aboutyouclothessimulatorandnewclothingshopssimulatorupdated simulator blogurl on top of we knitwear as clothing store stores with designer clothing we will fashion store custom clothing store their clothing all fashion store home clothes name fashion fashion dress shops as well as this urlhttp512youxicomspaceuid52120htmltop rated dress shop forumurl with our store cloth store in all the store clothing at home sure clothing store brand clothes business clothing sim clothes thrive clothing clothing home for good measure Check more urlhttpforumdevosrosecomviewtopicphpf22t5630p60512p60512Excellent Accident Lawyer Tipsurl 4c5f79e

    Noob 19129

    about 28 days ago

    To the people inquiring about peoples memorial cremation return home human composting cremation caskets cheap burial options green valley cremation locally owned funeral homes simple burial service bury under a tree human composting california companies earth funeral reviews best funeral directors funeral place cost of cremation in los angeles california funeral and burial cremation in california local funeral parlors planning a burial service funeral homes for cremation composting remains pre planned cremation services I can vouch for this urlhttpsnewsenucomhowdoeshumancompostinghelpwithreducedcarbonfootprintonetime offer on human composting blogurl for funeral specialist price of cremation care center cremation burial the funeral company choice funeral home cremation meaning simple cremation costs the average price of a funeral small funerals funeral mortician cremation options for ashes cremation services san francisco tree planting burial return home body composting crematory photos cremation facilities near me return home composting cremation services cheap funeral homes las vegas online funeral directors funeral package price buried without embalming pre funeral also See More urlhttp20315718427bookalakornboardviewtopicphpf2t2770808p3395658sid420ee08819c2be10445193ae79f03473p3395658Useful Garden Buildings Siteurl f79e0b5

    Noob 19129

    about 17 days ago

    To the man asking about low code adoption low code database cross platform mobile application app modernisation native app hybrid app benefits of application modernization top mobile app development tools low code platform benefits dropdown menu widget java rad I highly suggest this urlhttpsjace2j68jwj5blogmazingcom27053798recommendedinfofordecidingonlowcodeplatformrecommendationsnew Lowcode Platform detailsurl or micro front end in angular low code workflow low code ios app development app modernization services react low code platform best no code database debugging mobile apps development in cloud low code explained citizen developer low code not to mention this urlhttpsarcherzaxr63940loginblogincom33723215greatnewstopickinglowcodeplatforminfocheck this out about Lowcode Platform urlurl not to mention camunda bpm hybrid mobile app framework hybrid app framework rapid development tools low code app development open source mendix low code example camunda sdk app development platform from monolith to microservices ms sql server java connector and dont forget this urlhttpsgregorysniz96273wikisslcom724651besttipstoselectinglowcodeplatformexamplesmore hints about Lowcode Platform siteurl which is also great Also have a look at this urlhttpsbeckettwehg18407blogmindscombestsuggestionsondecidingonlowcodeplatforminfo25193011read more here on Lowcode Platform detailsurl not to mention a push notification native app hybrid app cognito angular cognito application rapid application development pdf no code low code platforms azure and sql cross platform programming azure openid connect moving from monolith to microservices on top of this urlhttpsjuliusxcbv23333wikilinksnewscom5289994goodideasonchoosinglowcodeplatformrecommendationsagree with about Lowcode Platform infourl with oidc azure low code mobile app monolith to microservices case study open source low code platform characteristics of rapid application development no code app building platform camunda process engine aws cognito javascript camunda cockpit cross app development for good measure Check more urlhttpsanitapicforum2gonlviewtopicphpf5t15117p162177p162177Excellent WIN1000X Infourl 9f6c4aa

    Noob 19129

    about 14 days ago

    In reply to the people talking about slot88 rtp aplikasi game slot rtp in slot mega jackpot 88 to pada slot pragmatic situs slot situs slot88 indonesia cuan 88 slot rtp slot hoki I highly recommend this urlhttpsmartinzwql96363homewikiacom10688041topinfoforselectingwin1000xwebsitesconsultant on Slot WIN1000X adviceurl or slot mahjong online ninja slot link alternatif unduh slot online situs online 88 link aplikasi slot permainan slot pragmatic situs online slot gacor slot terbaru pragmatic login slot gacor aplikasi permainan slot as well as this urlhttpssethnnke28495blogezinecom27521996excellentnewstoselectingslotwin1000xwebsitescheck this out about WIN1000X forumurl on top of download permainan slot slot88 togel website resmi pragmatic online casino indonesia game slot online slot gameplay online slot gacor mega jackpot 88 slot88 rtp slot adalah permainan and dont forget this urlhttpsgunnerchhd16272wssblogscom27475168newsuggestionsforpickingwin1000xsitessuch a good point about Slot WIN1000X linkurl which is also great Also have a look at this urlhttpsrafaelrxdi69124canariblogscomgoodfactsforselectingslotwin1000xsites42806592over here about Slot WIN1000X forumurl as well as to pada slot jaya slot panduan slot lucky slot login cuan slot 88 login url slot gacor slot88 link cuan88 slot online login casino pragmatic play login alternatif and dont forget this urlhttpssergiovekp02468bmswikicom4482840newfactsforselectingaman88siteswebsite on Slot WIN1000X linkurl with yang punya pragmatic play slot online mahjong permainan slots link live casino taruhan slot wap slot fortune slot 88 link alternatif app game slot situs web slot link alternatif fortune slot 88 for good measure Check more urlhttpselectronoobsioforumindexphptopic371newnewHigh Rated CUANSLOT Tipsurl f79e0b5

    Noob 19129

    about 2 days ago

    To the person asking about judi toto online judi slot online 24 jam agen slot pragmatic play terpercaya slot 09 game slot web sini slot link alternatif judi toto agen judi slot online terpercaya aman judi game judi jackpot I highly suggest this urlhttpplaymolifannetspaceuid2078344htmllink for dvl toto siteurl or slot streaming hk casino slot spade gaming apa nama situs judi slot online bandar slot login live chat casino slot casino online indonesia web judi slot online cara main game judi slot company on top of this urlhttpsbookmarkboomcomstory17361017slotslot88andapaitujudislotonlinewhat do you think on dvltoto adviceurl not to mention ion casino live22 login online slot game online indonesia bandar judi terpercaya di indonesia satu play login bandar online deposit pulsa sini slot login game slot kuda slot casino online gratis judi 4d online on top of this urlhttpsbookmarkickcomstory17405017slotduniaandjudislotituapamoved here about dvl toto siteurl which is also great Also have a look at this urlhttpsezmarkbookmarkscomstory17463147slotplayandgamejudimore helpful hints on dvltoto siteurl alongside all game slot 88 online playtech slot indonesia apa game slot slot game yang mudah menang main slot 88 login yggdrasil slot rtp apa nama situs judi slot online aman judi sbo play slot rtp ion slot and dont forget this urlhttpsjase9y24zmz2creacionblogcomprofilecool dvl toto siteurl with judi jackpot cara judi online slot flow gaming slot game link game judi online slot deposit judi slot web judi online aman judi macau rtp bandar slot idn for good measure Check more urlhttpsclubdellectoredhasaesforoviewtopicphpf6t11739p79997p79997Excellent Buying Gold Blogurl a023d94 To the people inquiring about link slot indonesia game slot apa minimal deposit togelup link web slot slot game yang mudah menang web judi online play tech slot pragmatic slot login slot online dana ovo judi online 4d I highly recommend this urlhttpsagendabookmarkscomstory17284809maincasinoslotandbandarslotloginwhat google did to me about 7rajatogel blogurl or live22 login online slot online casino slot play star slot online live bandar slot88 login rtp sgp slot jackpot terpercaya macau casino online main slot login bandar slot idn and dont forget this urlhttpsgrowthbookmarkscomstory17312019sinislotloginandmaincasinoonlineuseful 7rajatogel forumurl and dont forget link judi playtech slot online slot microgaming rtp tinggi sini slot login live casino bonus judi slot online malaysia keren 4d slot login login pragmatic slot mesin judi online www judi slot online not to mention this urlhttpsbookmarkusecomstory17216760judislot88andlinkjudislotonlineupdated blog post for 7rajatogel linkurl which is also great Also have a look at this urlhttpstornadosocialcomstory2774502judislotonlineandcasinologinfull article on 7rajatogel adviceurl and dont forget situs agen judi slot online judi slot88 apa itu judi slot online slot88 login online judi slot 7 playtech online link slot online indo judi game slot live slot gameplay as well as this urlhttpssingnalsocialcomstory2655262agenslot88andsingaporeslot88logincool 7rajatogel detailsurl with login judi slot judi joker123 slot buat web judi jago slot indonesia hk casino main slot live link slot judi slot dunia spin slot online playtech online for good measure Check more urlhttpanoreksjaorgplviewtopicphpf27t561345p3068159p3068159Excellent Garden Extension Websiteurl

Login or Sign Up to post comments on this tutorial.