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

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

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.

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.

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

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!

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.

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.

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!!

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!!!

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.

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

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?

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.

That antenna was ingenious 😀

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 KZfaqrs 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!

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

May i ask what speakers you are powering? :D

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

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 !!

Great test! Excellent explanations!

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

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

Great review ! Thanks a lot :)

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

Nice review - thank you!

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.

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?"

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.

Textbook review! It's all there: general info, technical details, improvements and mods, running it under various conditions... excellent work! Thanks! ps: the Banggood link you provided ... do you get Banggood points when someone purchases this module? Coz I plan to buy one and it would be great if you could benefit from that too.

Hi Dave, If those test points were not available, could you have simply connected your scope to the speaker connectors? Could you show how you would use your scope to test a typical home stereo? Where you make connection points etc? Thanks for sharing and thumbs up.

Thanks for your time

nice little piece of kit :)

Nice video like always Dave! What do a search after to find that orchestra soundtrack that is a masterpiece?

Love your attitude, old guys rule!

Nice video.

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 😊...

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

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

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

Awsome the way to you teach!!! thanks! a lot from San Luis Potosí, México!!! (i look it because i bought one. and i need the specs. and you give moore that I was looking.

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.

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

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!

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

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?

Nice mod and fun little board for DIY enthusiasts. Thanks for the range information for the wire length. Can that Osciloscope measure THD, WATTS AND DECIBELS?

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

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?

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.

Nice Video Thanks. What speakers would you recommend?

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

you are awesome to share!!!

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😅

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?

One more thing, on iPhone 6s six “boxes” of volume is the highest volume you should go to stay under clipping, just under 1/2 volume.

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

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

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

I have two 150 watt stereo speakers that would work great with this little amp.

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?

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!! 😊

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

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

Nice video sir, How is the bass response.

you're excellent thank you

@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?

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..

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

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

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

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

you're a cool dude!

unbeliveable!!! WoW

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

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?

I just got one of those was trying to find some videos on KZfaq about it turns out I made a good choice for a cheap amp off eBay

Great vid! yay, # 1.

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.

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

Hi there. Any chance you could answer a question for me? When you connect that audio in, in the middle of the board, does it override the Bluetooth? I'm wondering how that would function if I used it in a home speaker project :-)

So your neighbour would often see you hold a phone walking around randomly in front of the yard with the loud music playing~ LOL

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

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

Banggood also has a nice 24 volt DC 9 amp switching power supply. I noticed the maker of the bluetooth boards recommends switching power supply. The supply power has to meet the rated output power, so, I looked at a lot of supplies. One of the other youtube commenters also mentions 19 volts as the 'sweet spot' but I have yet to find a supply that comes that way; probably take the 24 volt and trim it some with the control pin.

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?

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,

I have a really important question: Under the heatsink is there only one chip? Or there are two TPA3116 chips? I really need to know this to calculate something for a future project. Thanks in advance!!! Anyway, cool video!

it's use full video. i am looking to buy it. i want to know if we can connected the antina which buy in shops? can be batter the just sold wire? thanks for sharing...

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.

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.

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

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

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

Great review! Quick question: Can you connect your smart phone to more than one of these amplifiers at the same time? The reason I ask is because I would like to convert a pair of Bose 301 speakers to Bluetooth and install these amplifiers inside the cabinets, along with a lipo battery pack and charging circuitry, switches, etc. And, I would want true stereo - which would require two of these boards. Thanks!

I just got one of these it works great but there is a lot of hiss how can I fix this?

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

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.

Please let me know where I can download the track that you played in the video.Thank You.

lol, you're neighbor looked at you like what's Dave up to again xD