TDA7293 100 watt audio amplifier kit test and review 

I love your none BS videos, always refreshing, to the point, solid testing, gives me much better confidence to buy an item after watching your vids! Thanks!

Yours are the best and easiest to understand specs/measurements for an old dafty like me. Great stuff John...

Incredible amplifier! really powerfu, hifi taste and subwoofer. One of best power amps in the market!

I would totally love to see a video of this amp hooked to your active filter drive a sub woofer. Nice video as usual.

You did a great job putting that board together. Great video, thank you.

I love big-chip AB amps, analog is miniaturized and it's smooth AND DMOS output is my favorite driver transistor. ST make great devices!

Fantastic video! Keep it up!

You are my go to source for testing these cheap chip amps.

Thank you so much for this video sir Now i become more eager to have assemble this kit in addition to my collection 😻

Finally. A great video of the all mighty TDA7293 chip. Had been looking around for this kinda video from months. Thank you so much for this great video. (Coul you please suggest a good power supply for this amp. Can't use the toroidal Transformer)

Great review as always.Thanks.

That's a lot of power for such a small chip! I wouldn't have thought that could do any more than about 20 before clipping. Be a good subwoofer amp for a home theater sound system.

That's a fantastic rundown of that board, I've got a similar one (hope it's as accurate in spec as yours was). But I've been having a heck of a time finding resources online that explain clearly enough for us newbies on how to properly power up a Center Tapped device like this in real world scenario (as in, not connected to a special bench-top power supply). Could you possibly do a video where you explain where to get, and what kinds of supplies are needed, and how to figure out best transformers for your needs (and things like, what's the minimum size you can use for your project board, how to safely wire it up to mains, any additional parts needed (like what's this stuff about additional power bridge rectifier boards I've seen a bit of) ...etc) Thank you so much.

wow, that is a power house!!!, hi John, looks like I'll be getting some of those too.

Great video! I prefer amps that can use simple power supplies or batteries though (also already assembled, lol). You are much more handy with a soldering iron than me 😁. Keep up the cool vids and get your hands on one of the TPA3116D2 2.1 amps...they are impressive!

On your brief testing that must be one of the best chips around at present. Leaves the class D stuff well behind. Almost tempted to get a couple and do some full tests on distortion, frequency response power bandwidth to see how close it gets to a full Hi end amplifier. Interesting if nothing else. PS We would say IT'S THE DOGS BOLLOCKS!! Just a thought, I see many suppliers put 2 or even 3 of these in parallel to produce amazing power output for very little money. Forgetting about the extra power, the current delivery must be amazing. I think I will investigate this arrangement, should! sound better even at normal listening levels.

thanks for your videos. would love to see a test on ljm l15d pro. I built 2 amps with them and liked them a lot. but I don't have any instruments for testing.

Nice job. Thank you! I wish you could have used 3 or 4 different frequencies to test for distortion though.

Love the PhotonicInduction drop there!

There is TDA7294 100 Volts 100 Watts DMOS Audio Amplifier IC, TDA7295 80 Volts 80 Watts DMOS Audio Amplifier IC, TDA7296 70 Volts 60 Watts DMOS Audio Amplifier IC. This DMOS audio amplifiers is aimed for the home audio market. Excellent RU-vid video 10 out 10.

John I enjoy learning from your videos. Would it be possible for you to add Frequency Response/Range test to these AMP? The RMS Output and THD is good, but would love to the what range they will play.

Could you give more detail regarding the low pass filter input? Specifically, one that would allow speaker level/high level signal input into this little jewel! Thank you for your hard work, time and attention.

Very good reviews

Hi there john, i just recieve a couple of this audio amps, a good ebay offer, $3 - 4 dollars each, the board or pcb version is "yx-1536", with a couple of big 50Volts - 2200uF capacitors in it. (maybe a "nichicon" copy but functionals caps), i'm planning to feed this with a 40 Vac or 48 Vac central tap transformer, max 50 Vac. (possibly from a microwave, i built one lately at 36 Vac central tap and it kicks good!) i have a couple of projects with this amps, power a couple of sub woofers; one sony 8" at 6 Ohms (SS-WG490) that i carefully reconstructed, and rescued from a very nasty hands and other handcrafted that i have around ages with no spk in it, but ready for action. it will recieve a 10" s.woofer probably. seeing your video, i'm possibly changing my mind, because of the distorsion factor wich is minimum in this amp... im just thinking... well, what do you think about this amps for power a s.woofer? (max 10" s.woofer at 150-250 Watts) it is efficient or is too much for (i mean quality vs power) ? or is a better option for a full range amp with a decent preamp? i hope to read a perspective from some else who make a similar project and can tell how was the experience too, it will be helpfull, and thanks in advance. thanks for your videos john and sharing your work with all of us, greetings from Colombia.

can l parlel the speaker out for higher power for subwoofer amp

John, i would really like if you could provide the link where to buy this amp and all others that you review. I am trying to find this TDA 7293 kit and can't find it... I am a new sub, love your work.

Woow Never thought i see this from integrated amp...Just wow..

out of all the DIY kits out there which would you recommend preferably one I can wire right to a AC120V wall outlet and stereo that can also use one of those cheap Bluetooth mp3 decoder boards ?

John, I received one of these assembled. I have a Hammond 56V CT transformer. I see some kind of monolitic IC on it which I presume is the rectifier bridge. Is there any other external components beside fusing and the transformer that is required to use this amp? I have a large heatsink for it and it is also mounted to the inside of a aluminum chassis with thermal grease with the heatsink mounted on the outside of the chassis. What kind output power does this amp produce into 8 ohm load?

There's another version of this amp with a bridge rectifier on it to accept a 50 - 60 volt center tapped AC input and the issue with the amp is you get small but annoying AC hum in the amp. I've removed the bridge rectifier and I plan on setting it up with a decent filtered DC source and I think this will clean it up like what you have with this amp in this video. I am going to use this in a small bass guitar amp but I don't plan on pushing anymore than 50 or 60 watts RMS into an 8 ohm load with the option to run a second external 8 ohm speaker but still not push it past 60 or 70 watts RMS. I may reply back to this video and let you know if removing the bridge rectifier and setting it up for a split DC voltage cleans up the hum. I did add a steel plate to the bottom of the amp to deal with any grounding issues and it helped some so with a little bit of luck going to a DC input will remove any AC hum.

So, what are the voltage rating on the polarized capacitors? Is it safe at +40vdc rails?

Hi John, greetings from Brazil. How we can specify the transformer current to feed this IC, let's say, on your examples for 32V+32V both 4 and 8Ohms loads?

Damn 11 watts per dollar? Not a bad kit right there.

this chip is used in lots of active subwoofer used in consume eletronics. the philips sw8000sa is one good example

So you need two of these for stereo sound and what kind of transformer would be needed?

dear john can you tell me how much current and a voltage transformer is it needed for normal (not over driving these ics) working of this ics if I needed a sterio set up with two of this

Are you measuring the supply voltage? or the voltage at the speakers?

This chip is used in the Marshall MG series amplifier.

What wattage would you get with your test setup into 8 ohms @ +/-15v and +/-18v please if it's not too much trouble? I figure it's probably about 12w & 17w respectively but I would like to have those values confirmed if at all possible.

hello friend: very interesting review of that integrated circuit and very well explained, I congratulate you for that good explanation, I also wanted to ask a question, would it be possible to build an amplifier for guitar with that kit? Thank you in advance for your response.

Hi, Thanks for this video, I bought 2 of these, but the version that you can use AC directly on them and they work very well.I use 2x30V AC 300VA transformer (measured is actually 32. something so it goes to the max 40V DC after rectifiing).I cool them with 2 AMD coolers (they are cold enough up to 30 percent power to not run the fans) and the fans are powered by a 5V USB adapter once I need more power.Most impressive is that they are dead silent when there is no input.I added a volume control and it started picking up some noise, but you can barely hear it and also is the same noise regardless of the potentiometer position.Anyway nice product and very cheap.

thank you very much sir!

Oh one other thing, any turn on thumping or is it silent at power on?

Hey John how about doing some active filters?

Hi John. Great video. Just wondering if you have any thoughts on higher voiltage rails. I can get my hands on a couple of transformers (for free) with 34VAC secondary. After rectification, with no load, I should have +/- rails around 46V to 47V. Should be within spec in theory. If I trim the gain back a touch to limit the power output, I figure I'll just have a little more headroom, less chance of clipping/distortion right? Any other disadvantages I need to consider? Look forward to your reply. Love your channel by the way!

if you were to use this full time, what would be the best power Transformer to use?

Can u please tell me how much power i could get into 4ohm load at 12-0-12v 6amp transformer??plz reply ..

If i'm not wrong this is the only chip that you've reviewed that puts out this kind of power (Class AB) with close to no distortion. I had these boards for a while now and I was waiting since a long time for you to review them. The only down side to this chip I can think of is the dual rail supply apart from that I am gonna use it in a Subwoofer. You should really check out NCS (No Copyright Sounds) on RU-vid, That might help you with the Sound test of these amplifier tests you do. Thank you for the Quality Content.

Awesome, there is any replacement in 2024 (A/B) not Class D?

If I use a 12-0-12 volt, 3 Ampere transformer, will it be okay if I am using it for lesser Power output ? Will the chip draw more current in this case ? (I got the Tda7294 instead of 7293)

I have tried the same amplifier and I hear a quite unpleasant hum/white noise passing to the speakers. Do you have any explanation/solution to this? I tried it with 18 volts. Could this be the problem? Thanks.

I bough this same board awhile ago. But the 2 chip version w/ paralleled outputs for 160 watts max power. At the time I think it was about 8 or 9 bucks. shipped.

I ordered a bord that looks alot like this only with out the IC and its made for the lm3886 which i have some OG lm3886's so i hope it works well

Can you show me how to power the amp I dont have that machine you have?

Looks good. I bought 3 ready made kits for £3.50 each so maybe they're lower spec. Components don't look as fancy and mine is rectified. I am guessing I don't need to Insulate them from the heat sink?? Looked at the data sheet and it said only power transistors needed insulating in one of the schematics. Did you just use paste?

Hey john I just receive mine and is ac volt it mark on it and it as a bridge rectifire on board

Anyone know where one can still get this board? All I can find is a variation that accepts AC and has a rectifier.

Hi. For the missing RF lowpass on the input, can you use a little toroid core on the input lead, or best stick with an RC network?

Greetings from Xenia, I just found your channel and love it. I have a question, is there an American supplier for some of these OP Amp bare pcb's? Looks like everything from China is taking 4-6 weeks. Thanks in advance.

Hi can i ask again😂 what if i use 2pcs tda is it suitable with 1 transformer if yes how many vollt AC transfo is needed and ampere or it's okay if i use 2pcs 32-0-32 transfo for 2pcs tda or separate transpo for each tda? Or 1 transfo for 2pcs tda what do you recommend sir thank😊

I'm so late to the show but DANG! been decades since electronics classes, but you could "probably almost" use a huge bridge rectifier into 110-115v AC ( x .707?) to get 75-80vdc? couple big power caps to help suppress 60hz sliding past the rectifier.. and rock ON! (?)

hey John, when you review stuff like this could you please put a link to the guy/ item on ebay thanks mike

Hi John, great video as always. Would it be possible for you to upload that test tone of yours with the 1% distortion harmonic to somewhere like filedropper? I know you can make them in audacity but I'm not very confident in using it. Thanks.

Very clean power, but I REALLY hate the three power inputs, i can't use it portably with a voltage booster on pure DC power.

Any video ,same test with lm3886?

hi john! fantastic video! I just wanna ask, would a 24 - 0 - 24 V DC supply 4A suffice for the amp power supply requirements? thanks in advance!

sir good day just like to ask is there any way possible to bridge this amp using this modules and do you have schematic diagram of this boards , more thanks from the Philippines

Hey John. Can I use two audio outputs(a Bluetooth and a mic preamplifier output) into one amplifier board input?

Can I power that amp using a 15v 10A 100watts DC power supply?

can it work on 2x38v, how many watts would you have at 8 ohms?

This chip schematics for slave mode and 200W high eff. w/boost transistors. MOS transistors sound great.

John, I'm wondering if they sent you authentic chips for the test. I built these boards, and they promptly blew up! I also built a LM3886 kit from AliExpress...same thing. I subsequently built another 3886 amp, using chips from Mouser and they are working great.

DMOS "D" stands for Depletion Mode (as opposed to enhancement mode, not "diffused"

John.... I wanted to make one of these.... Can you give me your diagram? With the values of components... Plz... & how much voltage can it take...?

Hi John, I am interested in buying this kit, but does it come with proper build instructions? I am a complete novice where it comes to electronics, for example I will have no idea where to install the resistors on the board if they have different values. If there are no proper instructions ,do you know where I may purchase a completed unit.

Hi guys if anyone interested this was a project in the Elektor Electronics Magazine November 1996 page 44 . search American Radio history should find it there . It uses a TDA7294 same chip configuration as there are 94s 95s 96 all different power levels 50 W 80W 120W same pub board. .as for power you need a Toroidal and 10000uf capacitors keep supply leads short . also recommended is the choke, ten turns on a pencil 18 G with Parallel 10R0 resistor and 100nF and 4R7 in series to ground, A Barkhausen circuit to prevent oscillation with certain loads, as they are not just resistive as in the test! inductance and capacitive play a part as well. would like to see some 1Khz testing otherwise good video

The TDA7293 is aimed more for PA amplifier or portable disco amplifier. Impressive power in to 4 ohms at 92 Watts.

That's a dang impressive chip! I wonder if I got one maybe it could power my big 18 inch pa subwoofer!

DMOS = Dual (Complimentary) Metal Oxide Semiconductor ...also liked n sub'd! :D

64 volt +32 -32 volt power ? 92 wat 4 ohms. How many amps am I drawn?

What is the least supply voltage / amperage it needs to work?

I have a question- 1. What should be the power supply capacity for this amplifier ( Volts and amperage) if powered by unregulated supply like a transformer ? 2. While calculating a power supply for an audio amplifier (voltage and amperage) whether a person should take the maximum Wattage of an audio chip as given on datasheet in consideration or the actual maximum power before Clipping ?

Good Test

awesome !

Hey John, just so I'm clear, the total voltage of the chip is the total between the rails and not the voltage per rail? So 50 volts total means 25 volts per rail and NOT 50 volts per rail?

I have a question According to datasheet if more than 50 watt they have suggested a high efficiency circuit. Going away with this is good?

Nice!

ANY RECOMENT TRANFORMER FOR THAT AMPLIFIER PLEASE?

Can you share that pdf , I need to that to make this amplifier without board

How does it compare with LM1875 based amplifier in terms of distortion etc. ?

Question John...I thought these amplifiers were AC input thats what the eBay listings say only reason I ask is because you're powering it with your DC power supply. And another question around the 5 minute mark you have 25v by 25v is that considered 50v or 25v together? I'm looking for a transformer.

Alimentazione con 2 linee a 24vdc?

hi john, i hope you can point me to the right direction, i am planning to build a six channel amp using these kit/ module and i am wondering how can i wire it to a single output bridge rectifier, can i just parallel the supplies or should i have multiple rails?

Can you make guitar amp with it?

can you suggest me cheap resistor which doesnt stick to magnet? i have koa speear and beyschlag but it stick to magnet

hi. just a question. can you make 400W out of 4 of these by combining them? how does it work? thanks

What is the pilot signal for and how do you generate your test signal?

Would you recommend this module for PA use? I plan on building some diy array cabs for my mains. Thanks

Nice !! how much amperes do i need for tda7294 ?? i ve got + -39v and 2,5 A but lot of distorsion i dont know why

I bought 2 of these preassembled from aliexpress. I opened the first one and connected it to a 12v-0-12v AC transformer. as soon as I turned the power on the tda7293 chip fried. smoked the thing. I believe the chip was bad from the start. I took a few pictures of the amp before I tried to hook it up, and the TDA7293 had several of the legs that looked burnt.. they were darker than all the others. and guess what, that is the side the fried. I'll try the other one later.. it looks ok,, but who knows with these Chinese sellers. there is a few differences, the board I got, has a rectifier built in.