TDA7850 four channel audio amplifier test and review

[@leonardosanchez9234]

Man, your videos are great. Just learned a lot watching them. Thanks for your work!

[@creepingmee]

It was nice to see one of these T & E videos after so many of the (quality) amplifier design videos. A nice little break. Thanks John!

[@KuntalGhosh]

KZbin is the closest thing to time machine. Watching this video again and great to see snikers ❤️

[@MichaelBeeny]

I agree those terminals are crap. For use once, they are passable, if the screw heads don't mangle up first! But it's really bad news if you need to screw and unscrew a couple of times. I often end up soldering the wires to the board. I think the most irritating thing is you often cannot get a decent thickness wire even in the hole.

[@michaeljtessmer3689]

I put ferules on the wire ends; this avoids the connection problems.

[@carldavis8228]

I agree, POS connectors. Nice review Snickers. John, good input too!

[@iblesbosuok]

Snickers is like even-order harmonics in diatonic music. Add warmness in our life. Cheers from Indonesia

[@bassblaster505]

ive played with the TDA7850 before its actually a nice amp for 12V. this is what you do. 4 Ohm at 16-18V supply. almost 35-40WPC. if you have a nice heatsink, 2Ohm 16V get around 45W. Another good quad chip amp is the STPA003 and 008. 16V 2 ohm almost 50W! or run a TDA7577 which is a stereo chip in PBTL 1 Ohm 16V for about 80W. i have too much fun with chip amps

[@Clandaries]

It is still used in China Android head units. Just bought a new Mekede head unit with this chip an it seems really good. It does not cut down the bass at higher volume like other chips in other head units i used. Thank you for the video.

[@demoncloud6147]

Man, love your videos ! Really educational (for the technical details)

Greetings friend John. I don't miss the opportunity to see the tests you do on the amplifiers. I have learned a lot and have encouraged me to make my own audio systems. You could make a video showing which is the setup for the tests: filters to eliminate noise and some other resource to be able to clean the audio outputs. Thank you very much for the time and dedication you put into the videos. Greetings and hugs from Chile. (Excuse my English).

[@ferrumignis]

It would be interesting to look at the supply voltage at the amplifier IC pins with the scope when its loaded up. Voltage drop over the supply wiring and PCB traces can have a significant effect on maximum power in these automotive bridge amps.

[@KuntalGhosh]

Yup. & Thats why almost every test should be done on all 4 channel loaded.

[@jaminagan7434]

Thank you John, I like all your videos

[@allexandruprroca6713]

Thd testing, just what I've searched for, old subscriber

[@digriz602]

Hot off the China train. I chuckled.

[@coilsmoke2286]

TRAIN ? Oh ... ! That's Why R.O.C. "Shipping" is so S L O W . . . . . . . .

[@fernandojconti]

Nice video, very informative. Could it be suitable to be connected to a PC sound card directly or should I use a pre-amp?

[@wackenroader]

You can connect directly in earphone out, of a pc, smartphone or bluetooth receiver / dongle

[@BiddieTube]

Tardigrades can be one real tasty dinner. We prepare stuffed tardigrades maybe once a month. So delicious!

[@JohnAudioTech]

Water bears for breakfast!

[@zaraak323i]

You can use it to listen to The Who's Quadraphenia!

[@extrememod_ahu]

Thank you for the video. I'm working on a project where I want to connect the TDA7850 (just the chip, no circuit board as it sits on an Android Head Unit pcb already) to an external 18v power supply - a 12v to 18v step up converter. I noticed there are 2x VCC pins (interconnected) so wanted to ask whether I should provide power to one or both of the pins from that external power supply? Thanks

[@rich1051414]

The datasheet(later) clearly says 20-23 watts at 14.4v at 1% Distortion.

[@Yourneighborhoodmacaroni]

I'm just getting into this sort of thing as a hobby and I'm thinking of using this amp to modify a cheap soundbar. Correct me if I'm wrong, but I'm assuming that you're using the preamp due to running the music off your mp3. Or is the preamp used to control volume of the amp itself. Also, how much current does the amp draw at full volume?

[@bedlamite42]

Didn't expect a cat video

[@coilsmoke2286]

Hey JohnAT, Thanx again for fine work and sharing big knowledge.. What do you think of so called "Power Conditioners" ...? I think I hate them . AND their claims of drastically improving the sound quality of high end HiFi systems. Aren't most just WAY OVER PRICED power strips. I have one, was a gift, it is way empty inside. A couple MOV's , switch, indicator Neon, no filter(s), no coils. Basic nada. Can any of these power boxes be shown to improve sound beyond swelling one's head and placebo effect ...?

[@JohnAudioTech]

Good ones with actual filter components inside can remove a lot of the higher frequency noise on the AC mains which could get into audio equipment. Sensitive audio equipment probably has a decent amount of filtering anyway so the claims can be dubious.

[@coilsmoke2286]

@@JohnAudioTech Thanx !

[@Kenshindegozaru]

Why is the hiss present even in very hi fi ICs? Is something with the components, the circuit layout or both?

[@TheMazdamn]

Do you have experience with the TDA 7388 chip? If so, which do you think is better between it, and this one? I know the spec sheet claims this one is a little more powerful, but that doesnt necessarily hold to be true always. Any insight is helpful! Great vids!

[@threeMetreJim]

From your results, another IC manufacturer quoting peak power, rather than RMS power, in their datasheet. EDIT: just looked into it, seems like it's the EIAJ rating, which is the saturated square wave output power. Either way it is either double or close to double the RMS rating.

[@BryanChance]

That led color. it's whatever they had at the time. LOL

[@aaronstodolka3438]

Capacitors play a major part in the coloratura of sound.

[@johncoops6897]

Only for Audiofools. and never in double-blind tests. Everyone else knows otherwise. Not many modern amps use (need) capacitors in the signal path. This one uses some caps on the inputs to block DC, but the influence of those caps will be irrelevant above 15-20Hz.

[@marciojpcardoso]

I'd not say that the harmonic distortion was bad since it is indeed second harmonic and audiophiles appreciate those. I was really impressed by the performance of this chip. Although I doubt it can actually handle high levels of volume into 4 ohms, let alone 2 ohms. But it's a fine little chip for a home theater system I guess. If you use it with 8 ohms load at 14.4V. Should be good.

[@johnyang799]

You can read datasheet ei? They can provide much higher power at lower resistance load.

[@marciojpcardoso]

@@johnyang799 I can't understand your English.

[@johnyang799]

@@marciojpcardoso You can read the datasheet. 20W to 4Ohm, 40W 2Ohm clean power from datasheet. Believe the datasheet, it's not deceiving or anything.

[@marciojpcardoso]

@@johnyang799 I don't believe in data sheets. In believe in real measurements, that's why I watch theses videos.

[@johnyang799]

@@marciojpcardoso The results are consistent with datasheet. Problem is, you are still guessing.

[@amitghosh6966]

Please make a video on Output power comparison between Single vs Split supply powering Tda2030A, 2050 & Lm1875 chips

[@omsingharjit]

M confused by measurements of this ic of " output pins resistance =3ohm " what mean by that ??

[@JohnBurgessMusic]

Even from China, in bulk, the TDA7850 chip costs around $10. So for an assembled board, along with all the other parts to cost $10 seems suspect. Maybe it's just a clone of another common chip.

[@paulosaints100]

I have a head unit with chip on my car. So which speakers should i combine?

[@bobking7347]

Its got thermal protection, it does say its 2 ohm stable so its probably fine... Not in this implementation though with that tiny coil....

[@mawiinek]

hello, do you believe where it is located on this amplifier where to connect Mute and St-by? because I have a problem with crackling during startup. I will be grateful for the hint. greetings

[@anglerandy5736]

Can this be bridge for 54w rms at two ohm? My China android head unit has this and I amplified the rear speakers in my car with a 2 channel so I want more wattage to my front speakers.

[@chesaudio5430]

I think it's already bridged

[@phrankdatank]

Sorry for the dumb question, but if it’s 4 channel but you have 10 speakers, how does that work?

[@kjoh42]

Amp review: Excellent as always Spelling: Disappointing :)

[@JohnAudioTech]

No spell check with a pencil :

[@gombade7458]

I also always doubt, that these are genuine ICs. The amount of times, I have received obvious faked ICs from Ebay is appauling. Anyway, good review.

[@thatgregguy]

How does this amp compare to a Bose or Harman Kardon for sound quality and range?

[@Thomasz-Tech-Innovations]

Can you get input and output from those Jack's?

[@aslanakbulut4325]

why is there dc 12v audio interference?

[@Bananerocs]

How would one filter the input signal either with and LPF or HPF?

[@evaldaskum6086]

Hey i want to ask you maybe you could help how to connect it to car? i want good audio sound from it with no noise.From my phone or tablet. Pss:Thanks if you could help.😊

[@ronshaw80]

I wonder if it is a real chip, or a counterfeit chip. China counterfeits so much, its always a gamble.

[@threeMetreJim]

You find out when it goes pop at 50% of it's full rating. Don't try driving 4 2 ohm loads - a counterfeit will probably die pretty quickly.

[@vicentezaldivar5152]

Red led!!!

[@felixcat4346]

Obviously this was designed to be used in a car, so your'e not going to hear much of the distortion.

[@aljivenalejo3904]

nuh its not distorted the amp forgot something the stby pin it will distort if the vs signal input is not filtered and switch a transistor

[@MagDag_]

What class of amp is it ?

[@NotMarkKnopfler]

Do you have a link for the amplifier? Thanks.

[@JohnAudioTech]

Search TDA7850 on eBay and many will show.

[@travis4798]

It's a multichannel mosfet made for cheap car radio's, enough said. You get into overdrive territory (typically 75% on a car radio) and distortion does get unbearable. I've had several decks all have similar mosfets in them. Even with proper settings and making sure there's no final distortion, you can still hear something odd at full volume. Also the heatsinks and power supply's are pretty pathetic on car radio's, as well I don't think these mosfets have enough surface area to properly dissipate heat especially at 50 watts. Nothing beats a dedicated 4 channel amplifier, I had a 400 watt class D tucked away in my center console. Not only did I not have distortion but it brought up the midbass and offered crisper high's, and that was at low volume.

[@ahmedalshalchi]

I advice you to check Audio Power amps. from Japanese ICs like TOSHIBA and SANYO like TA and LA respectively.... They are incredible performance than Europeans ....

[@anglerandy5736]

Looking at sanyo STK4231V what else do I need? Do they make any higher power amps? Need a 4x100w 4 ohm.

[@ahmedalshalchi]

@@anglerandy5736 STK is not Sanyo made but Sankeo ... Sanyo amps. start with LA ...

[@MrDunk66]

👍🏾👍🏾👍🏾👍🏾

[@jigyjigy9182]

I 'm always waiting when the cat showing up during each your video. And i purchased mistakenly, instead purchase 4 input-4 output version for my micro bi-amp project, i purchase 2.1 version because it's so similar look a like. Moral story: dont make point-shopping without your glasses.. What a sucks.

[@adithyapillai4259]

4x80W at 2 Ohms? Lmao. 320W into that small little chip. Seems like the perfect way to burn down your car/house. But as always great video :D

[@czmik]

Even more since its class AB

[@johnyang799]

20W per channel for 4ohm load before clipping 40W per channel for 2 ohm load before clipping. Efficiency is more than 70% before clipping. It can go as high as 80% after clipping. If you have good heatsink shouldn't be any issue. High temperature wouldn't cause fire. With semiconductor, it will die before csusing fire.

[@adithyapillai4259]

That's clean power guys. The datasheet says it can do 4x80W into 2 ohm loads at 10% THD.

[@johnyang799]

@@adithyapillai4259 Yeah higher power output higher efficiency according to the datasheet. And you don't really use it at clipping do you? Not even full amplitude sine wave.

[@cristopherdelgado5978]

Porque dicen que tiene 4 x 50 watts?

[@wackenroader]

Yes, in 18v 20A with a large cooler.

[@Jose-kv3go]

Tda7850 4x50 4x60?

[@tusdelirios333]

12 v at what amperage?

[@hi-fidude6670]

It's class D, that's all I need to know to find out if it's shit. I mean it can't be something else, a class AB would have to be larger than that

[@po-tehnike]

18 voltage to max power. Give 18 voltage

[@carlfranz6805]

Anyone else believe that cap is more then 440mf? More likely 220mf.

[@westelaudio943]

It's 16V... From the size it looks more like 4700u I'd say but it's hard to tell.

[@johnyang799]

@@westelaudio943 It's very possible to be 6800uF if it's 25V. 16V 10000uF is not impossible.

[@westelaudio943]

@UC153-icHfJvzpqQWM6f8Q_g Yes it looks at bit small for it but it's not impossible.

[@JohnAudioTech]

My meter reads it as 10,000uf

[@carlfranz6805]

@@JohnAudioTech I stand corrected. However, I am amazed.

[@natecontarino1748]

I lost a lot of money on that LED.

[@valentinedpg]

11:15, White shoes?...CALM DOWN!

[@trickyrat483]

Cat didn't like this amp. Gone to sleep.

[@mmer1207]

bought one don t sound good to me

[@johnneybot9542]

China is using while you are on that train China people like Snickers !!! Won Ton Snickers LOL It would be good for something like a door income system