TPA3116D2 120 WPC Bluetooth Audio Board test run

Here is a link to this unit
www.banggood.c...
Great little unit.

[@BruceOrand]

Your 1/4 wavelength at 2.4Ghz used commonly is 31.25mm which is 1.23", not 1.5" And considering BT is 2.45Ghz, that length is closer to 1.20". Trim your wire a bit and you may increase your range slightly. Best to cut that PCB squiggle and attach there a short run of coax center and ground that should be available and run that to an antenna that is a minimum of 1/4 wavelength away from the dome-peak of the electronics to reduce the floor interference. Thanks for the video, by the way.

[@carlalm6100]

I've built two ammo-box bluetooth speakers using coaxial speakers made for cars, works really well. I'm powering them by a 7,2Ah AGM battery and mounted a charger inside the box with a "cicle of eight" connector for 110/200V on the outside. Also mounted a small LDC panel showing remaining battery. Since the steel box acts a bit like a Faraday cage, I had to solder a tine coaxial cable to where the base of the surface mounted antenna on the board were, scrape off the rail, thus deactivating the original antenna. The cable I soldered I then connected to a Wifi connector that I mounted on the box and then a Wifi antenna on the outside (Both bluetooth and Wifi uses 2,4Ghz so it's perfect). Works quite well and has both good range and power, even though I could only mount one battery in the box because of limited space, two batteries giving 24V would be better.

[@puchu9507]

Excellent analysis, made my day I am building a 5.1 system and isolating woofer completely paired with it's own amp, this helped me decide on what configuration to use as I am using 12V to make it portable as well with a Li-po battery pack. So in theory I should still be getting ~50/~50 L/R with ~50W 2.1 channel or 2x(50W+50W) + 2x(~50W) making part of the system portable while keeping overall performance good enough.

[@rickspadafore5916]

After watching this video a second time i ordered the TPA3116D2 form Bang good. It also comes with an acrylic case

[@BlankBrain]

From what I've read, the sweet spot for the TPA3116 is right around 19 volts. If you provide some 4700 uF caps in the supply, you may also get better sound. I hope you make a video when you hook it up to your main speakers. It would also be interesting to see how much difference there is between Bluetooth and line-in.

[@mrthealok]

BlankBrain same amplifier I'm connect 12volt 3a supply and load 15watt each channel but sound not working in speaker it's any falt other wise Can improve my voltage and amperes ?

[@avrahamchamish521]

After trying three TPA3116D2 based amplifiers I ran into the same conclusions as "BlankBrain's" I operated the amps off 19 Volt 4.7A Dell laptop PSU's with 4700uf filter caps, Alternatively used wired and BT input sources. Sound great. FYI! on public domain sites there are 3D printing plans for cases that fit some of those Bluetooth TPA3116 amps. I tested with Definitive Technology surplus bass drivers and had to apologize to the neighbors. They claimed their dogs filed for relocation.

[@ChristianRThomas]

@@avrahamchamish521 I concur as well. If you want a really well made laptop supply then the best I have come across are the Toshiba ones. Beautifully made and properly screened. I have a few Dell supplies here but haven't tried them - not least because they are attached to laptops and might be missed. Also they don't have the standard barrel connector. But they should be decently made too, but the Toshiba ones are exquisite. I was really surprised how much went into them.

[@christophergonzales1191]

thanks for sharing. antenna trick and line-in still of great value. had this thing for a year and only using it now. this amp is loud for its size!

[@geosplayground663]

Hi , You mean Audio Ode? like Alternative Audio output? Hope to answer this question because i have this board also and i want to add more mini amplifier to this board

[@johnieleltitandelais]

I really love the way you explain everything... Thank you

[@geosplayground663]

it's an aux output, so how can i hook it to other Amplifier

[@jeepman1244]

I bought one per your recommendation! I mounted it on back of some Bose bookshelf speakers I was not using that I got off ebay! Got it paired with my chrome book it sounds and works great very pleased. Thanks!!

[@karthikeyay2988]

It has any analog input ??

[@jaystrader8450]

Thanks for the update, I just purchased one off Amazon. My wife wants an expensive surround sound to play movies off her phone. I have about 5 older speakers from an old surround sound system. Badda'Bing'Badda' Boom. I hope I can get this going for 19.99. Lol

[@Rendraco79]

THANK'S A LOT FOR SUCH A GREAT VIDEO! i appreciate the knowledge of a senior electronics expert as you. greetings from colombia.

[@RollingTardis]

These boards are great for dead bookshelf systems, saving the speakers from scrap. I have to try the 1.5 inch antenna mod.

[@raulfernandez9111]

Yup. I just gutted out my klipsch promedia 2.1 speakers and am replacing it’s amp with this amp.

[@georgecorey1320]

My own tests on this unit are as follows: Needs the antenna mod shown in this video but that makes the Bluetooth work great. Very easy mod to do, see this excellent video. Comparing it to a SE EL84 tube amp, both capable of low volume good involving sound without fatigue or need to turn it up. This digital amp on a 24 volt 2.7 amp laptop power supply begins to clip symmetrically at 2 volts RMS with 8 ohm load, odd harmonics, so 1/2 watt per channel. Very similar power to my SE tube amp. Frequency response flat 60 - 18,000 HZ. Mild roll off at 40HZ, more at 20HZ, but still some signal there. The SE tube with much more low end slam than this despite equivalent watts. My speakers only go down to 50 HZ so bass is not what I am after. Will actually use this amp, I think, as it is very good sounding at low volume for near field listening. Convenient Bluetooth implementation. I think it sounds just a little better on 19 volts than 24.

[@justinmurphy2227]

Don't understand how there are four month old questions unanswered and videos put out since, in fact 4 days ago. Believe me I understand how busy life gets and maybe this isn't your only job and you have other responsibilities, and you're not the only one that does this, but the last two questions are really good questions and would determine if I would purchase this amplifier or not. I promise I'm not being a complete butthole but you stated that banggood sent you this parade review oh, I'm sure it was they would like to see the questions answered as well as the rest of us. Honestly this is probably one of the best videos only amplifier boards that I have ever seen! But this is like getting an awesome product and no service afterwards. Unfortunately you can't answer every question in your 20 to 30 minutes of testing and I'm sure you won't be able to keep coming and watching the video after the first week and they have. Comments from subscribers and non-subscribers are what are part of the logarithm but also the interaction of you commenting back and answering the questions! It would be to everybody's benefit if you and other KZbinrs would keep the interaction going by actually answering the questions that you generate with this video and others. I'm sorry but I do think my actions are Justified because I had several questions and I don't even know if this is going to be seen. Should I subscribe knowing that my questions may not be seen or answered in a week after or even at all? Would you subscribe to my Channel or any other channel that is an information-based format where the owner doesn't interact with their subscribers? If you start doing this and answering these people's questions, I'll gladly stay subscribed and refer others as I have a few friends in the car audio and audio world. I know you may not need our subscriptions but honestly I don't know how you wouldn't. I will delete this if I can get a straight answer back. Thank you and once again a amazing video!

[@12voltvids]

I try to respond to every question I see. However I have almost 1400 videos on my channel now. Not every question I get a notification of. I only respond to questions I know exist and that is when I receive an email notification from youtube. If I don't get an email to tell me there is a question to a specific video then I don't know there is a video there, and again, I have 1400 videos up, and can't possibly look through every video every day and see if there are new comments. I have brought this to youtubes attention in the past, but nothing has changed. Many of my subscribers are also patreon members and ask me questions though my patreon channel or send me an email directly from my email link. Those ones I do get and respond to. I am still answering questions to videos that were posted 5 years ago, when I get the question. Also be aware that this is not a full time job for me. I do work full time and then some, putting in an average of 9 hours a day at my day job, and do not check my email, or youtube channel during work hours. If you knew the hours that I am policing the channel you would understand how much work it is just dealing with the crap that everyone that has a channel has to deal with. Also, if a question gets posted that someone puts a URL in or a link, youtube automatically flags that as spam or potentially inapproiete message and I never see those unless I go into that junk folder and check. So some legit comments are sitting in limbo because the poster included a link or URL in the message and youtube quarantined it. This is done to stop malware. If it was a public message and someone clicked on a malware link then their system could be compromised.

[@YouGotItGiyl]

Great info. Thanks for talking about this being a balanced output. I wasn't aware that I couldn't use a common ground. I bought a new speaker that likely has switches and such. I didn't know they bridged negative wires together which would cause amplifier failure. Thanks.

[@theodorerooseveltiii4199]

RMS power is .707 peak. I did ohms law, on 24 volts, and an 8 ohm load...would be 72 watts (flooded) and .707 that is 50.9 watts rms max per board. So I'm thinkin' 120 watts per channel, is peak to peak rating. A lot of audio companies list this rating, and I grew up on classic electronics, so ohms law and i squared r always comes to mind for power.

[@ChristianRThomas]

Well, almost. The 24V is DC so that is + or - 12V peak. 0.707 of that is 8.something Volts, giving 9W. So how do they get to 50W or even 120W? Well, it's actually rated for a peak of about 26V DC, if I remember correctly, but the main thing is that each channel here is bridged, giving you twice the voltage range, and so 4x the power. But that's still only 36W and we still haven't taken into account the dropout voltage. So they spec it into 4 ohms to double the power, and 50W is then, possibly, a reasonable spec. For 120W they put both channels in parallel and they spec it into 2 ohms. You need a 2 ohm speaker to achieve it, of course. At all these high levels you are really thrashing the amplifier (and it would have been nice to see him put some sine waves on a scope driving various load resistors to see if it can really manage it). In fact, on the scope topic, it would have been nice if he had the slightest clue about what he was doing, or how these things worked. I have run a couple of these off a standard 19.xV laptop supply and that's probably a comfortable supply level to give it. It's likely to last longer than going to the full 26+V.

[@martinallen3492]

May i ask what speakers you are powering? :D

[@jaakko200987654321]

this board is great!! powering it with a 4s lipo and it has bunch of power at 8 ohms. starts to distort easily at 15 volts, i will add a voltage booster and set it to 25v

[@brancarr1]

I can't believe the difference that 1 1/2" wire made. I figured it would get slightly better but not as good as it did. Your neighbor was looking at you like, "what the heck is Dave doing now?"

[@MrBrymstond]

I just love these credit card sized BT Amps. If you ask me, this video could have easily doubled in time and I'd be happy, but still a great video. I have one that uses the tracks from the PCB and they set the BT module on the PCB and used the tracks on the board as a antenna, they did use liquid tin not solder and that allows me to go all over the house and outside and I have real aluminum siding.

[@audiokees4045]

I have a tda 7498 version, however it is very bright and have low bass. sounds very raw.

[@MrBrymstond]

@12voltvids How is it able to put out 120 watts per channel 2 channels driven so 240 watts from 24v @ 3.2 amp? I'm stuck on stupid here, I purchased 24v at 4 to 6 amps, but 240w divided by 24v = 10a if it was 100% efficient and it says 3 amps needed?

[@guherrera84]

Hello! Are your speakers powered by or powered by the amplifier board? What is the volts and amper of your source? My Bluetooth syncs but no sound comes out.

[@Donatillo1961]

I just soldered that antenna....soo soo thank you for that tip ! I am so happy and greatfull for your instruction !!!! it works awesome ! 1.5 inch antenna !!

[@rich1051414]

3 inch antenna works slightly better, but not worth the extra amount of dangling wire.

[@Chris-qg9rz]

I have the 150w x 2 non Bluetooth, great board! 24v

[@dirtyoutlaw9981]

24v how much amp dose it matter more better

[@bobreyes7997]

Can those buttons for skip/volume up, play/pause functions be reprogrammed using Arduino or Raspberry pi?

[@jhingtanjaytravels3052]

Hands up for this review.. thank you sir for this video 👍🙌... it is helping me.. because im going to purchase this Bluetooth amplifier... you are a specialist... keep on sharing.... and thank yoy 😊...

[@katraonline1204]

Can you please clarify if the pin out header (LGR pins) on the board are outputting the same audio as the Bluetooth? Does that mean I can connect that aux output to another amp to achieve a 2.1 setup or 4 channel setup? Is the output line level? Thanks in advance!! 😊

[@abogreisha3714]

hi, at 14:00 its not an input but its output as for head set or you can add another amplifier to the board, i have tried that and i foud it output, i have something to ask about, am trying to connect TPA3116D2 the normal board with Bluetooth decoder so i can use multi inputs like USB, AUX, SD CARD, Bluetooth but the main problem is the Ground loop noise, do you have aidea so i can avoid that nise? thanks,

[@Electricworld-1]

Hello please can you tell me what are the best speakers to connect to this module as I have one thanks to your review . is this module 4 ohms to 16 ohms capable?? I'm trying to connect the multi speakers to it but I don't know the specifications of what it could handle. and I cannot find any spec sheet for this module. i found out from Texas instruments that you could be from 3.2 to 8 ohms am i my correct??

[@cryptodream5092]

That antenna was ingenious 😀

[@cj-ib5zw]

I've read through the comments and didn't see an answer fora question I have, which is probably simply due to my ignorance. My question is can I use this to power some speakers on my ATV? From the comments it seems as though these boards require some means of regulating amperage.. Can I not simply run power to this board straight from my atv 12v battery which is fused at 10A but ofcourse I can put and online fuse in place but that wouldn't really "regulate". If I can't use this board what do you recommend? It will be mounted in a waterproof p BOSS brand 6" Tube ATV speaker. I took apart the Boss tube and it surprised me that it came with a board style amp as I expected it to be in an enclosed style. Once again that's my ignorance with this type of information. Any advice or recommendations would be greatly appreciated.

[@Reefgc]

Hello! Could you tell me where I can find the music you used for testing here? It sounds great! Thx in advance!

[@heyimamaker]

Thanks for the review! The one thing that I don't readily find on these boards ( Amazon and so on ) is if they have that annoying "Blue Tooth Audio" voice. Maybe I missed it, but is there an on-off switch? Does it pop when you turn it on or off? And how do you think the Bluetooth performance will be once it's maybe mounted inside of an enclosure?

[@davidallen2254]

yes good amp but how do you get it from popping and crackling

[@sumandhamala8514]

We can use this board to replace harman kardon go plus play mini board? Does this ok for harman's tiny 3.5 inches speakers?

[@joeydelmarsjr.646]

for the 2x ch 3116d2 can i use a 19.5v 12amp power supply to get 234w divided by 4ohm load to get about 58w out of each channel?

[@FrederikMunchHansen]

Hi there, could you tell me if you have fixed the high bluetooth start up sound somehow? Could I change a resistor? Which one?

[@Deb38199]

Sir, what about noise? i brought from amazon after your review but getting little harsh... noise when pause playing

[@LeviHeizer]

I got this board for my car, but do you know how to make the starting volume of the board itself not completely maxed out?? Every time I turn the key on the beeping sound is deafeningly loud!

[@Pyridox]

The short 1-1/2" wire worked good to increase the range. Normally Bluetooth range is usually around 20 to 30 feet.

[@12voltvids]

Yes 30 feet is suposed to be maximum. That would be from the front door of the garage to the street, as I am set back 30 feet. The receiver was at the back of the garage, a good 40 feet from the road, and I crossed the road with it, so yes it dis make a huge improvement.

[@selfscience]

At 18:00 the signal seems to be cropped, looks like instead of peaks there are flat lines. Does that mean that the amplifier is flattening the peaking or the mp3 chopes the waveform?

[@learntofaceyourdreams]

Hi! I wanna ask the preset volume once you turn on the amp? Because some bluetooth amp sounds so loud once you powered on then you can only adjust the volume once connected.I want to consider buying this one if sure its not automatically in a full volume once turn on😅

[@ronniepirtlejr2606]

I'm kind of new to electronics, am I missing something? 120 watts per Channel??? 12 V. Power supply.... is that thing pulling 10 amps? Or at 24 volts pulling 5 amps? I know the thing has inductors but, if the amperage isn't there it's not there! So where does the wattage come from? One more question? 12 volts X 10 amps =120watts. So that accounts for one channel 120 watts. You said something about the inductor alternating? Does that mean the 120 watts is alternating from left to right channels, using the inductor/s? Thanks Dave. it's an honest question I'm not being a jerk!

[@12voltvids]

The way they calculate this is into a 4 ohm load. This power is also rated at the full working voltage of 24 or 26 volts not 12. Look up the specs of the chip. Also it is a BTL output. Each leg should be able to put out 50 watts. Remember that the speaker terminals are driven out of phase with each other so one side goes + while the other - and then they flip. Class D are very efficient so all the way of thinking and calculating power used on linear amplifiers goes out the window. These are pwm amplifiers and efficiencies are gained through those inductors.

[@ronniepirtlejr2606]

@@12voltvids okay, thank you! I appreciate all that information!

[@isaacfragmatic4651]

Is it 2tpa3116d2 with 1 tpa3116d2 per channel or it got only 1 tpa3116d2 onboard .? If it got to it can output around 100watts per channel more or less at 2 omh load..

[@lmatrix6626]

I bought that exact same board you have, but somehow i am getting no aux line out like you are? Is it programmed in some way to be able to do that?

[@nurdiantokpl2322]

Help ? can you please fix the bluetooth that often turns itself off? even though I already use 24v 5a it's still like that

[@jumpermh]

Do you know if there is a way to disable the very loud start up sound?

[@whirls007]

Thanks for the video. Been looking for an amp for the set of speakers I'm building and I'm going to order one of these. Great video!!!

[@julescarrier2932]

V3.1 of the board has the ground foil removed on the back side of the antenna. I'm not sure it makes any difference.

[@AutoBodyEverything]

What’s the minimal power requirement to power two 1.5” speakers at 10-20watts each? I’m trying to build a portable lipo powered unit.

[@AutoBodyEverything]

I have a few projects in mind from 1.5” speakers to 3” speakers but I’d like to find a Bluetooth board that I can use for various projects to eliminate research. Something they can push 3” speakers and ALSO be able to operate at low voltage for pushing 1.5” speakers because of the type of installation.

[@DIY-DaddyO]

Do you think you could use this board in an old car stereo body? Turning a classic car radio body into an in car Bluetooth speaker?

[@cristi.n]

Hello, can you please advice me with buying a similar amp, please? I need something for a ~50W, 3 way, old Sony, 6ohm speaker. I want to make it wireless, portable. What do you recommend ? This module or maybe ,meanwhile, you tested something else, better than this? Thank you so much ! Chris

[@Silverbugle2005]

Maybe I missed this in the comments or in the video, but is there a standalone power module that you would recommend with this thing? I'm still wondering how you would get 200 W with only 3 amps at 19v?

[@12voltvids]

Where did you get 200 watts? It is rated 100, and not at 19 volts. Here is the specs on the chip. Supports Multiple Output Configurations 2 × 50 W Into a 4-Ω BTL Load at 21 V (TPA3116D2) 2 × 30 W Into a 8-Ω BTL Load at 24 V (TPA3118D2) 2 × 15 W Into a 8-Ω BTL Load at 15 V (TPA3130D2) Wide Voltage Range: 4.5 V to 26 V So at 26 volts, into 4 ohms it can do 50+ WPC. The supplier claims 120 total or 60 per channel.

[@ranajoysutradhar9064]

Tell me the price of this board.. & how much watt of speakers is being played by you?

[@xchaos77]

Do you know if it is possible to add line in to use instead of bluetooth?

[@MrBrymstond]

The best review ever seen on KZbin of a $15USD device. How do you get 240 watts out of 3 amp?

[@ronniepirtlejr2606]

Exactly! I just asked the same question? I'm new to electronics but 12 volts 3 amps = 36 Watts tops!

[@trevgoodwin7900]

Hi Dave, I bought an amplifier like this after watching your video, it's great, my question is does the ON/OFF switch stay in the ON positon when the power sauce is disconnected? or does it automatically reverse back to off, the reason i'm asking is because I would like to install a toggle switch on the outside of the cabinet to turn the amp on and off, my thoughts were to cut the cable after the transformer and connect to a toggle switch, any help appreciated. Trev

[@jessetagore5385]

Is there a way to reset these boards. Mine rarely connects via Bluetooth or aux

[@theodorerooseveltiii4199]

I'm making a set of two speakers and building in one of BangGood houses Sanwu Bluetooth and amp boards. The one I chose has remote control over infrared.

[@Hayeso1]

Great info chap. I've just done the antenna trick!!! 😳 it started out at 5 meters and is about 30 meters now!!! Awesome, thanks. One question, what does the 468 equate to? Many thanks

[@raulsd.i.y.videos5585]

Where did you solder the antenna at?

[@Hayeso1]

@@raulsd.i.y.videos5585 on the board antenna.

[@DAVIDGREGORYKERR]

what about using a Slim_Jim antenna for 2304mhz or 5ghz and I am thinking about replacing the WIFI antennas in the back and front of my ACER Aspire TC-220 with Slim_Jim antennas for 2304mhz and 5ghz.

[@kanikama9579]

Can a stereo input cable be connected by soldering it?

[@gauravshrivastava773]

I have the same kit. But sound quality is not good. Can you suggest how to fix this?

[@mrthealok]

I'm connect 12v3a dc power supply and load each channel 15watt. Amplifier start and pair bluetooth ok but sound not coming why? It's low power problem?

[@ludwigandredebruin9193]

On low volume I get a bad his from it that starts to create distortion would there be any solution for it

[@reinaldoortiz4421]

Question, can you add a lithium battery to this chip and how or where on the board can it be done.

[@KissAnalog]

Nice review - thank you!

[@MrAston8]

What is the best way to wire multiple speakers per channel ? with this board?

[@matteodelledonne7853]

neophyte question: if I add if I add this amplifier in the car and connect the speakers from the car already connected to the car radio, what can happen ??? excuse the honor

[@anishtoms9960]

Lot of information on the board however just need your suggestion please.. I have a pair of 30W 4ohms woofer and a pair of 260W 8ohms tweeter.. Im thinking to setup a tweeter - speaker per channel with them so could use them as right and left channels.. Its setup in a single housing.. Like to know if this board be suitable for this speaker setup.. if not then like you to recommend the best amp board with bluetooth please..

[@Ensamma_Vargen]

Love your attitude, old guys rule!

[@javieracevedo6196]

Hi, i really like your'e video and I learn a lot, but i have a little question, it is possible conect a signal to the board without the bluetooth reciever?, this is because I keep in mind build a guitar amplifier 200 Watts, and i need connect a guitar signal to amplify. Hope You can help me.

[@JodyKoewe]

Hi , great review...i have the board also and you mention that the out put where you solder the ground on, also an input can be.....did you try that out?...i like to hook this up to my broken active loudspeakers but i want no latency, for music playing purpose ..thanks in advance Jody

[@asdf154]

What song is that in the middle??? It's so good!

[@johnflorance8183]

Great test! Excellent explanations!

[@GabryelChannel]

Greetings from Brasil! Can you please tell me if you notice any "hiss"? Many of those bluetooth amplifiers have that problem, and I bought one that is similar to your amp.

[@rabbyrut]

Thanks for actually using a spectrum analyzer to do the review. There really isn't enough empirical data in reviews on here.

[@AnthonyCamposL]

At 24V, how many amps do you need to work correctly?

[@sailegifted6960]

At least 3 amps, I have one of these really are great!

[@TomDubYeah]

Loved the review but what watch are you wearing i love it!

[@scottdziubinski7419]

Great video. Is there away to reduce the start up sound. Mine seems to go at full volume which is way to loud.

[@guggejons5132]

Same here, need a fix for this.

[@katraonline1204]

Can the output of this Bluetooth amplifier board be bridged in any way to connect it to one speaker? So, instead of 120w x 2, you get 240w x 1... is this possible?

[@12voltvids]

The outputs are already bridged so no, it has to drive 2 speakers.

[@katraonline1204]

12voltvids thank you for your prompt response!

[@robertopereira2639]

Hi I need 100w RMS for my car subwoofer. Wiche board you recommend

[@jbx907]

power rms? Pms=1/2 x V^2/R, that aint going to get near 125watt @ 4ohms, calc 72watts on 4ohms

[@fecklarjenkins2549]

Does it go into a low power standby mode if no bt is connected

[@AmosTalampas]

its help a lot, thanks for the review, i have one of that

[@ridenipony]

Me i dont have

[@kyoudaiken]

Do you have equipment to determine the distortion of the output when it's not clipping?

[@12voltvids]

No I don't have a distortion analizer, so I have to rely on published data.

[@tijs7866]

Hi, I have one question, how many current do I need if I use 24VDC, is 3 Amps enough?

[@Todestelzer]

Tijs Stremler P=U*I You need 24V/10A But 240w is peak. Maybe 5A will be enough. Caps should handle the peak current drain.

[@lambo25]

Hi Kirk Nelson or anyone. Your expertise would be greatly appreciated. I built a portable bluetooth speaker box using the TPA3116D2 2.1 Amp.. Besides listening to music . I want to use it as a speakerphone for telephone Conference calling, I want to make telephone calls with this bluetooth speaker box.. What extra items do i need???

[@Sentinel4261]

Hi there good video thinking of getting one but the first question is what I would like to know, dose it have the annoying Chinese voice? Cheers.

[@danfuerthgillis4483]

Anyone know if this version with the Bluetooth has the same noise floor hiss as the other unit without Bluetooth? I bought 2 of the non Bluetooth, replaced pots with 10k and still hisses so it is unusable.

[@jimcatx3090]

Danfuerth Gillis mine sounds like crap too

[@danfuerthgillis4483]

@@jimcatx3090 I have looked at these and fixed the problem and now I am actually stomped how this tiny Piece of crap is laughing at my Rockville Power Amp!!! LMFAO. Remove the heat sink then you need to remove R3 ( complete removal ) and replace R4 with a 5.6k resistor. You do not need to use an smd resistor just wired in a regular resistor ( film barrel) and wire it's legs on the R4 pads then put the head sink back in and use some hot glue to hold the sides down properly. I emailed Rockville and sent them some pictures of my little box I put this amp in with 1/4 input and output jack's added along with a power push button on top of the box. It's hilarious how this little plastic box has this power!!!. It turns out these little amp boards have the wrong value resistors in the power amp section pushing almost 40 dB so lots of noise will sneak through, the 5.6k resistor on the R4 will fix this problem. This was on the non Bluetooth boards ( same board just no bluetooth module ). This little board is now my home theater sound amp and also my guitar amp box lol.

[@jimcatx3090]

Danfuerth Gillis I would I Never buy anything from Rockville so it’s not saying much for this amp board it is pretty loud I probably would waste my time working on this board I have about 10 different ones i play around with in the winter I have the gains set about 1/4 way so u can’t hear that bad hiss so it’s not bad I have some nice clean boards that blow this one out of the water

[@danfuerthgillis4483]

@@jimcatx3090 Yep I ordered 2 Bluetooth 120x2 boards and 2 non Bluetooth ones. Since the non Bluetooth boards arrived I worked on those but was disappointed with the hiss even at low volumes. These boards require 10k ohm potentiometers and the R3, R4 mods. I did not even change the pots only the resistors and that eliminated all hiss and noise. These little suckers pack some massive punch and they don't get hot at all. I was playing guitar on a 4X12 cabinet at 8hms and this thing was actually more clean and had tons of power almost like a rack power amp lol. For its size and the simple mods to repair them at $5 per board might as well order a couple of them and build your own rack power amp with multiple inputs and outputs. I am building a rack power amp right now which will have features not available in $5000 power amps. Total build price with tube preamp, power amp, input and output jack's, toroidal transformer, fx loop section $110. The test box will be plastic shell to test the amp out which then gets transfered to a metal box after passing tests. It will have individual main back fans control, individual power amp fan control, and some other stuff on the front of the unit, like 1/4 , XLR, Midi patch through section to the back. It's a 420 X2 watts amp. Will be doing a video on the little amp and the big one once I get the parts in the mail.

[@jimcatx3090]

Danfuerth Gillis I don’t care may god have mercy on your soul

[@atqr88]

Hi there I've just bought one of these in the UK after seeing your video. 👍. Was wondering though if I used just a 12v power supply would the output wattage power still be 120w per channel or would it be less. Cheers John

[@SahinurUK]

Hi mate. I'm in the UK. Where did you buy from? Link pls. Thanks.

[@12voltvids]

It would be less. Supply voltage determines the p-p swing of the speaker voltage. 24v will allow for 24v p-p voltage swings per output rail. 12v would cut the output voltage in half so half power everything else being equal.

[@atqr88]

@@12voltvids Thank you for your reply. And give the bluetooth trick a try. Cheers John

[@atqr88]

@@SahinurUK Hi I got mine from Ebay just search for Bluetooth amplifier board, or Amazon has also. Cheers John

[@MrBrymstond]

The TPA3116 is a 100 watt chip and this has 2 so 200w, where does it get the extra 20w per channel extra, a total of 40 watts for 240watt?

[@rich1051414]

Overrating board manufacturer. The TPA3116 can sometimes do a bit more than 50x2 @ 24v and 4 ohms, but not 20 watts more. I guess Chinese find underrated specs blasphemous and must correct such dissent by doing things like that.

[@hermanlyle2240]

Any of these eBay bluetooth boards compatible with amazon echo dot?

[@georgecorey1320]

Really excellent video! For the audio waveform demo at 28:40 you point out 24 volts on scope. Were your leads across the speaker out terminals, and measuring entire balanced output voltage, or was one lead referenced to ground? This is a balanced output amp, I think, so it would make a difference in this amp. Have you done a measurement with sine waves? Have you tried the Bluetooth out points for audio in? I work on tubes only so far but really intrigued by this digital method, now that your scope showed me what is really happening in that tiny amp.

[@rz1246]

Thanks for the great video. I believe that you mentioned that the card has an input so would it then be possible to attach a 3.5m adapter to it in case I would prefer that? Any idea as to how much sound degradation for this BT vs. 3.5 m cable to your phone? Is the 30Watt @ 8ohm 24volt or 50Watt @ 4ohm 24volt accurate?

[@rich1051414]

Bluetooth has compression, analog does not, but it all depends on how good the DAC is. Bluetooth can potentially be just as good if the integrated dac isn't great.

[@karthikeyay2988]

I'm searching for the comment for analog input can I connect analog input ?? Or solder the wire or something? ?

[@mattzuchowski4505]

I just got this and not sure what type of power supply to buy for it? I don't want to get something too high of power or too low. Any Suggestions Thank you.

[@mrthealok]

i same question?

[@Bu5H84]

please could someone tell me the formula to work out the length of the wire , i cant figure out how he did it.

[@jbx907]

whats the real wattage per impedance, what is the max voltage swing

[@manuelpena3151]

Hey @12voltvids - Oh Mhe GhaD! I'm only now getting baptized in/on bluetooth basics and this project/presentation is a great start; I can easily jump to "broadcasting" off my cell phone's mp3 player... may even use a mic and mixer... ;^) THANX