TPA3110 Bluetooth Amp Board Review

[@zetaminor77]

Thanks for the video! By just the appearance, I seem to have the exact same amp. I was wondering where to connect the speakers and my battery and you showed me where in your video 😄

[@cobaltpica]

i ran mine initially through a 12vdc 500mAh regulated wall wart. Sounds okie. Then i switched up to a 18vdc 1A wall wart. The soundstage opened up and the midbass is no longer lumpy. Finally i hooked it up to a Studer 900 24v Linear Power Supply and my jaws just dropped on the floor.

[@theoloniousfunk]

Awesome. Glad to see you are putting out more content. Apparently KZbin didn't feel the need to notify me when you put out your previous 2 videos so I guess I get to catch up at lunch tomorrow. Thanks again for taking the time to produce and post.

[@zarboaudioprojects1430]

Thanks for the feedback, I'm glad it's at least tolerable. I'll get better at this KZbin thing as time goes on. Thanks for watching the whole thing.

[@katiekumcgil]

the key pins are so you can add buttons and resistors to enable /on,off/play,pause/next,previous,i think pause is 51k to ground, next is 33k to v+,-previos is 9.1 k to v= and 0R to ground ,,i will make all the proper calculations this weekend and get back to you with the circuit diagram all corect values,will do mute button as well and also a aux line out ,which comes in handy cheers KT

[@zarboaudioprojects1430]

Thanks a lot for posting this! I had recently seen some mention of doing this on another similar product and wondered if it would work on this. This will add a new level of control and access to this board, nice, thank you!

[@katiekumcgil]

i just have a cpl hours of testing i think the sw is to put the bt module in at or copmmand mode aswell but will test it out ,im just not 100% sure wether the key on amp board and key on bt module are linked as to final wireing,i needed to get new magnifing light as my eyes are starting get blury on small things

[@katiekumcgil]

Hi i havent forgoten im still waiting for 2 more boards to be delived,so far my testing has shown that the key functions will connected to the bluetooth modules key pin ,as it seems that that functionality most likely has been left out on the amp board itself,could you do me a favour when you have a chance ,have alook at yours and see what bluetooth module is on it ,just list how many pins and pin order and any numbers on the circuit board,just want to see if they are shipping with the same bt modules ,thanks Katie

[@katiekumcgil]

actually an update the sw and key on the amp board do actually run to the sw and key on the bt module the sw is definatly to put the bt module into AT or command mode which we wont ever really have a need for ,its for if you want to control the bt module directly say from digital pins of an arduino, i will double check this weekend if my calculations for the resistors are correct and ill let you know that evening,ill try get every available function sorted ive also made an aux stereo output its tapped just after it comes oiut of bt module its so i connect up a powered sub for instance or run it into a mixer

[@BrianThomas]

Great 👍🏾 video. So many videos like this and folks just are saying anything during the video. You're walking through almost everything, which is fantastic. Question: what if I wanted to connect this to a battery pack? How many batteries would you suggest?

[@jannekallio5047]

Same here videa was just what I needed, but I also need additional info :) I want to create BT speaker from an old radio, just using the case and the speakers. I want to have 2-4 batteries and a usb port to charge the thing... question is: what else I need in addition to this board?

[@zarboaudioprojects1430]

I like a 12V setup for this. It allows it to still run on the cool side and not stress it, but also allows for decent wattage and output levels. Parts Express sells an all-in-one battery charger setup with power supply that would work great for this for about $40: www.parts-express.com/12-VDC-Output-Power-18650-Battery-Charger-Bundle-325-203 It would probably run for a good day solid at normal levels if not more before needing a recharge. I've used it and it's really powerful. You could also go the Aliexpress route and get a single- or double-18650 battery holder/charger uninterruptible power supply unit to run this with. They have ones that take 5 volts and output 12 volts. Thank you for the feedback!

[@zarboaudioprojects1430]

Just in case you don't get notified of my below response: I like a 12V setup for this. It allows it to still run on the cool side and not stress it, but also allows for decent wattage and output levels. Parts Express sells an all-in-one battery charger setup with power supply that would work great for this for about $40: www.parts-express.com/12-VDC-Output-Power-18650-Battery-Charger-Bundle-325-203 It would probably run for a good day solid at normal levels if not more before needing a recharge. I've used it and it's really powerful. You could also go the Aliexpress route and get a single- or double-18650 battery holder/charger uninterruptible power supply unit to run this with. They have ones that take 5 volts and output 12 volts. Thank you for the feedback!

[@zarboaudioprojects1430]

Take a peek at the link to the Parts Express battery board I mentioned: www.parts-express.com/12-VDC-Output-Power-18650-Battery-Charger-Bundle-325-203 This uses it's own power supply, (15 volts I think) to charge the batteries though. You wanted to charge via USB 5v. Well, there are a few uninterruptible power supply battery boards on AliExpress that use 1 or 2 18650 batteries like I mentioned, they can be purchased to charge with 5 volts, but you need decent amperage to actually charge with them. Might be a good option, though.

[@fabianghitoiu5098]

good evening, what charger works with 12 volts and how many amperes for this module?

[@katiekumcgil]

Please wait for me to double check and test values for this weekend thanks

[@mafoli]

Hi! Any update about it? Was curious if there is a terminal for aux/audio in😅 Was planning to buy this board for me to add a mic input board for my portable karaoke speaker project😁

[@katiekumcgil]

yes hon,it has solder tags for aux audio input

[@christianjebulan5872]

Hi, evening, I got the 30w version of this and I was just wondering what does the KEY do? And any chance on the SW to do it's purpose, like switch off and on?😅

[@zarboaudioprojects1430]

The key pads might allow for some buttons to be used to control a few functions. They would be used with resistors. I have not verified this, but it might be a good place to start a search.

[@SarahKchannel]

The function of those 'SW' pads etc depends on which bluethooth module you have installed. Mine has weirdly a FM tuner built-in that gets activated with the switch and some button combo.... Also I had to put a cap over the +/- pins of the bluetooth module itself, or any volume position above 50% would lead to a reset of the device. The internal voltage regulator circuit on the PCB seems a bit weak, when the speaker kicks-in the voltage drops momentarily enough to make bluetooth reset. Tried bigger PSU, Cap on the amp board, but then only a cap over the power rail of the Bluetooth module solved it. But in general a neat board. Wish there was mode docu, like how to reflash the firmware with custom device name etc.

[@zarboaudioprojects1430]

Good point. I have seen 2 or 3 of these same basic amp boards with slight variations to them. It's not uncommon for there to be 'solderable' pads with markings on a board which do nothing. I've dealt with it a number of times. I haven't seen an FM version of this board... that's creative. You've messed with these boards a bit more than I have I can see. I was just happy to be able to get a decent clean pre-amplified signal to run a VU meter off of. You're right, documentation on most of these boards really is lacking. I would think it would be in their best interests to have as much documentation for those who would like to 'tinker' more than the basic hookup, but they constantly just put the minimum or less info.

[@AirandVR]

Great Video, thank for this.

[@jansteen3676]

Can I connect only one speaker instof two or will this damage the amplifier? 2:18

[@zarboaudioprojects1430]

You should be fine to connect only one speaker up.

[@BouazzaAmeur]

great job thanks this device turns off when voulme is up, it disconnects bluetooth conection, is there any answer about this?

[@zarboaudioprojects1430]

Bouazza, check out SarahKchannel's comment below. I haven't experienced anything like what you are describing so far. One possible cause could be using a power supply with a smallish amperage rating. Possibly try a PS with a higher amperage capability to see if that helps?

[@atakanyldz1926]

Great informative video that answers all my questions. Thank you and keep up the good work.

[@zarboaudioprojects1430]

Thanks for the positive feedback. I'll get better at this but thanks for sticking with me.

[@uncellcare1561]

Sir please create new video bcz I have 15 watt 8 ohm speakers so tell me about how to create bluetooth speaker like mine

[@williamfraser]

Thanks for the video. I bought a similar unit after seeing this video. I have tested it on various drivers and it really shines on my hifi speakers. Just a question: what effect does input voltage have on performance and efficiency?

[@zarboaudioprojects1430]

Technically, I don't really know. I didn't dig much deeper into it that what I showed in the video. But, practically, I didn't hear much difference on 4 ohm speakers between 12 volts and 16 volts, which I think is as high as I went. With these types of Class D amps you don't usually want to max out the voltage if you're running 4 ohm speakers; with 8 ohm drivers, you can usually go higher with the voltage. The specs say 8-26 volts, but realistically for this $3 amp, you're not likely to put out the $$$ for a pricey 24 volt power supply, so used laptop bricks in the 16 volt range are really where this unit can do it's best work for little money. It's a lot of fun for just a few bucks, right? Amazing times we're living in! Thanks for watching and for the comment.

[@williamfraser]

@@zarboaudioprojects1430 I powered mine with 3x 18650 Lipo cells and used a tiny boost converter to step up the voltage. I also found that there is no difference in volume on 4 Ohm drivers when increasing voltage from 14 to 18V. I noted that the amp heats up just as much with tiny 1.5in drivers as with my hifi speakers. I guess 4Ohm is 4Ohm, but at similar volume settings the actual difference in volume is astronomical. The tiny "full range" drivers are only rated 3W though (not the Neodymijm magnet type, but they did have noticeable excursion) so I did not push them too hard. I'd love to know if you have any experience or tips for designing enclosures for such small drivers. They seem to perform well with teacup size portable bluetooth players, often fitted with an additional passive driver.

[@zarboaudioprojects1430]

@@williamfraser Here are a few links to projects I've made with smallish drivers. They all sound differently obviously, but the DMA45 driver especially is well suited for small radios with acceptable upper bass output: techtalk.parts-express.com/forum/tech-talk-forum/1443156-nd65-mini-radio techtalk.parts-express.com/forum/tech-talk-forum/1435288-taking-a-crack-at-a-tiny-bluetooth-speaker

[@williamfraser]

@@zarboaudioprojects1430 excellent read, thanks! Did you discover the issue of reversed polarity marking on of the the speaker terminals on this board? My board has this problem but I only discovered it with the two speakers right next to each other.

[@caljazz]

boa noite, ótimo vídeo ,excelente música...

[@zarboaudioprojects1430]

Thank you! and thanks for the comment.

[@WW-jz8zd]

Grat video. I have one of these boards. Do you know if there is a way to connect external Aux input to this board? Wondering if its the L-R-Gnd pins under the bluetooth module connector.

[@zarboaudioprojects1430]

I imagine you could clip the three signal input lines from the bluetooth daughter board going to the main amp board, and install a triple-pole, double-throw switch (I think that is what you would need [break-before-make if possible]) and get your signal in that way.

[@WW-jz8zd]

@@zarboaudioprojects1430 So I played around with the KEY switch. It turns the power on and off if you short it for 3 secs or so. The SW is apparently meant to switch between Bluetooth and Aux, except this pcb does not have a separate Aux connection. Turns out there are boards on Ali that come with a separate Aux connection. I might order one of those too.

[@zarboaudioprojects1430]

Thanks for reporting back what you found out. Yes, it would probably just be easier to get one with the ability to connect to an aux input built in, I agree. They're pretty cheap... as long as you don't mind waiting for them to show up.

[@BrianThomas]

It sounds great

[@junjungebutan843]

Can i use 50 watts speaker ?

[@zarboaudioprojects1430]

Sure you can. I've connected this to several different speakers and it worked fine with all of them. Your loudness will vary depending on which speaker you use, and 4 ohm speakers will generally play louder than 8 ohm speakers, but it will work with basically any speaker pair you use with it. It just may not get very loud.

[@junjungebutan843]

@@zarboaudioprojects1430 thank you

[@deepakkumarkumar7186]

Can i use 20w speaker??

[@zarboaudioprojects1430]

Sure. A 20 watt speaker basically means that if you feed the speaker much over 20 watts of serious music, it may have thermal issues. Really, any wattage speaker can work with any wattage amp, and vice-a-versa.

[@deepakkumarkumar7186]

@@zarboaudioprojects1430 thank u so much 🙏

[@iftekharhasanrezvee7636]

Bluetooth paired beep is best but power on tone is disgusted, it also should be beep

[@jeffm2787]

Advice, try not to solder on camera. TDA? Annotate any mistakes in video editing. Not sure why you've not seen a wattage rating expressed that way before...if you say RMS Watts you've failed...epic fail even. Good luck. Edit: Bass roll off is from input capacitors, high frequency roll off is from the output filters.

[@zarboaudioprojects1430]

Thanks for the input. That was probably too much soldering looking back at it. I made the mistake of not catching my mistake. I'll get better at this I hope, thanks for the good wishes!

[@davitbarbakadze3801]

В реальности 15ват не возможно получить

[@RobertDickens2002]

You're making the #1 mistake the way you solder you don't put solder to the iron.

[@zarboaudioprojects1430]

In my defense, I'm half blind and can't really see what I'm doing. :)

[@RobertDickens2002]

@zarboaudioprojects1430 I wasn't trying to be ugly I still make the same mistake even though I know you're not supposed to also thought I was horrible at soldering turns out it was crappy wm and hf soldering irons.

[@zarboaudioprojects1430]

@@RobertDickens2002 No problem at all. I do solder like a toddler even though I have a decent iron so I am doubly without excuse! :)

[@RobertDickens2002]

@zarboaudioprojects1430 hey it worked and good video.