300W+300W TPA3255 - How Much Power can it really do?

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In this video '300W+300W TPA3255 - How Much Power can it really do?’ I’ll show how much power it can do without a fan and then with a fan.
Link to TPA3255 Amp board: amzn.to/3zVBt65
Link to PreAmp board: amzn.to/3y0IjY8
Link to Power Supply (looks better than the one I have): amzn.to/3pgfQsp
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Please use links that cost nothing extra but will help support the channel:
TPA3255 Power Amplifier board: amzn.to/3LgRZTl
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MicSig Oscilloscope: amzn.to/3B4DcXe
MicSig Differential Scope Probe: amzn.to/3HvRG4A
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EEVblog Comments on Fluke Rant: • Capacitor Types in SPI...
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Testo 760-2 Multimeter (on Sale): amzn.to/38PQE4H
Amazon Commercial 90DM610 Multimeter: amzn.to/2XOO4pf
Redfish Clamp-on Power meter: redfishinstruments.com/produc...
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TDA8954 Class D amplifier: amzn.to/2LBqvxF
100Picoscope 4444 (differential scope kit): amzn.to/2V4sRK0
GW Instek MDO-2204EX (has Generator, Power Supply, and Multimeter):amzn.to/3xmCQYa
Micsig Differential Probe: amzn.to/3oUDtVu
Micsig Current Probe: amzn.to/3nRso6v
Hantek Current Probe (low cost): amzn.to/3qrbVHH
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Uni-T 2-Channel ARB Generator: amzn.to/3iibBs5
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29 сен 2022

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Комментарии : 99

@Expedition18 Год назад

Love how you covered every question that popped into my head after first few minutes of lay up. Fan use, small fan, fan placement and usage of different meters and seperate measurements from all. Good work and great video

@KissAnalog Год назад

Thanks Glen! I appreciate you!

@versace885 Год назад

HI EDDIE, You do a great job explaining the information and also making it very interesting and Knowledgeable. Thank you 😃👏😁👍

@KissAnalog Год назад

So nice of you! I appreciate you!

@robmccoy21 Год назад

Mr. Beeny is great, lots of valuable content.

@KissAnalog Год назад

Yes I agree;)

@MichaelBeeny Год назад

Thanks Rob, cheque in the post lol

@joat_mon Год назад

We electronic types must be part rabbit... We go down rabbit holes pretty often. 😁 Thanks for the video!

@KissAnalog Год назад

LOL that is so true! Wait was that a squirrel;)

@ChrisDIYerOklahoma 11 дней назад

Great set up and testing! So, bottom line, what is the actual (old school stereo rating) RMS wattage power @ 4-ohms with a 48v power supply?

@xorkcorknup Год назад

Hi! I am a bit confused about the wiring. I want 600w in mono. How should I connect the speaker wires? Thanks in advance

@Scrufboy Год назад

What difference does having the small fan pull the heat off of he heatsink show? Aiyima just released last November, a pro unit of their A07 TPA3255 implementation. They made some design changes to their thermal interface by introducing a small ingot like chip of aluminum between the 3255 and the heatsink. This had thermal compound on both sides. I swapped this aluminum bit for a pure copper ingot of the same shape and thickness and I upgraded the compound to Thermal Grizzly Kryonaut Extreme - 14,2 W/m*K. This greatly improved the cooling of my unit. My op-amp upgrades though forced me to put some custom heatsinks on the regulators... I don't have a means to efficiently put vent holes in the aluminum chassis so I might run it without the top. Great video... Thanks for updating us!

@KissAnalog Год назад

Thanks so much! It is really how much cooling you can get to get the power out. I don't know if I've tried the Grizzly Kryonaut. I look to see what I use and get some of this as well. I need to do a video on the types of thermal compounds;)

@janoschluccamarek 11 месяцев назад

Wich amp-board would you recommend me for a powerful speaker like the Precision Devices PD.186/3 or the PD.153ER/2 ?

@dennissinger7880 Год назад

What is the best tpa3255 Board ? I need one for my 8 ohm 10" speaker . I thinking maybe to buy one mono for one single 10" pa speaker. I have now one tpa3251 2.1 board but i need more watt .

@fredcoy9498 Год назад

Thanks for your straightforward explanations in a easy to digest, pragmatic way. On power supplies, I bought some 1KVA toroid transformers years ago with the idea of PSs for class A amps, it never happened. They have dual secondaries each 42V no load, dual primaries too. Now I want to use them to power LFE/subwoofers using something like A TPA3255 based bridged amps. Trouble is the voltage is not right for optimal results. What do think? A regulator to bring it down to 48 VDC? Any insight or ideas you provide would be greatly appreciated.

@KissAnalog Год назад

I really appreciate you! The rails could probably go to 51 VDC or slightly higher. You could use diodes in series at the bridge rectifier, so the rectified voltage would be lower. Another creative way is to use several diodes in series on the primary side with parallel series diodes. I'll have to do a video to show this. Advantage of the primary side side is that the voltage is higher so the current is lower so the power drop on the diodes is less.

@fredcoy9498 Год назад

@@KissAnalog Thanks Eddie, you have really given me something to think about,! What about using only 2 lugs of those potted, heat sinked, full wave bridge rectifiers for the series diodes? How much drop for each diode? What happens with the current ratings when we get all those varying loads. Will we introduce noise, or will the diodes just act as one way valves with an IR drop? I think the Electrolytics in the TPA3255 unit are only rated for 50V. Sorry for all the Qs.

@TheGKnows 6 месяцев назад

Hi Great work! I would like to use Aiyima A07 Max TPA3255 Board with 13S Battery max 54.6V output. TI recommends between 53.5V and 56,6V with 6Ohm. I would run 4Ohm Speaker. Would be nice if you could test the board if it will work with 54.6V Thank you!

@michaelspiering7585 Год назад

So do you think that the 300x2 power rating is a bit of embellishment? Or, do you think that is a dynamic rating?

@KissAnalog Год назад

Thanks for asking! I go over the specs in another video, and it depends on the amount of distortion that you are OK with. Also, the heating or cooling will ultimately decide on the constant power. Here's the video with the specs: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-eybcVbWgFdA.html

@MasterofPlay7 Год назад

is that the Aiyima A07?

@yuhoyintony7125 8 месяцев назад

D類擴音機的效果有測試結果，文字寫出來就更加好了。TDA TPA 多種評測出來就無敵了，不是太多專業人士作出評測呢。我感覺D類再配搭一台胆前級接收，效果都非常好了，價錢平宜，享受音樂好像很足夠了，再配1對不俗的無源音箱，100美元的100-150W 95dB SPL 竟然聽起來好讚，人聲靚，聲音清晰，低音結實，整體配合非常好。

@KissAnalog 6 месяцев назад

Thanks it does seem to be a great value. What do you think would be a good input board?

@jutukka Год назад

Very nice video! I have a late 80's 2x250 W rack tube amp which is a bit bigger than this 2x300 watter, it weighs about 25 kg. 🤓 The cooling fan is about the same size as this amp.😁 BTW, why does your oscilloscope tell that 16.02 VAC RMS is over 46 Volts pk-pk? Shouldn't it be 2.828... x 16.02V p-p which is only 45.31V? (Same thing later in the video with 2.585 VRMS which was shown to be over 9V pk-pk, should be around 7.31 V p-p.) Is it not sinusoidal or is the scope measurement so inaccurate?

@KissAnalog Год назад

Thanks for pointing that out. I think what happens is that the measurements are taken on the waveform in the screen, so if there's not enough cycles the accuracy can be off. When I'm taking measurements where I want accuracy, then I make sure there are more cycles. As you increase the number of cycles, the measurements will change then stop changing as the accuracy is brought in. I zoomed in to show a single cycle closer to show the shape - that there was not flatness or clipping. A great way to do this and to get both is to grab a bunch of cycles then zoom in to see the single cycle up close. Does that make sense?

@jutukka Год назад

@@KissAnalog Well, I guess it makes sense. And it is not a problem when you know it. 😁 But still, the inaccuracy supposedly was so clear that I started to scratch my head for a while. And of course because I don't believe anything I hear and only half of that what I see. 😁 (I noticed it because I had been measuring and calculating several amp's output voltages and powers just last week so I was a bit sensitized of those numbers. 🤓) And again, very interesting ,thoroughly done regarding that component temperature measurement aspect as well. 👍

@KissAnalog Год назад

Thanks for pointing that out. I need to pay attention to that;)

@giulianosteifn Год назад

I have seen the video many times, but nothing about the audio power. Only temperatures. I need to know the output audio power for different impedances. Thanks.

@KissAnalog Год назад

Thanks - I'll have to do a video to show this. Have you seen this video? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-eybcVbWgFdA.html

@arthurswanson3285 Год назад

What is the max voltage this setup can output into a high resistance load (like say, 100K?) Will it approach the rail limits supplied to the amp, with the current draw in mA?

@KissAnalog Год назад

Great question. I think it would as there wouldn't be a large voltage drop due to the higher currents, but it would still need some headroom to operate. What is your application that would have a load as high as 100k ohms?

@arthurswanson3285 Год назад

@@KissAnalog resistance measurement, thanks!

@windward2818 Год назад

I hate the TPA3255 Power Pad package. Why is the power pad on top of the package and not the bottom? How do I conduct heat from the pad without putting uneven mechanical clamping stress on the package? How do I streamline production if you require me to have a specialist assembly method as to not overstress the part end of line when I attached the heatsink? How do you evenly distribute force over the chip without having a companion plate on the opposite side of the board? The FR4 board is not rigid enough to handle these point stresses without deformation, especially over the expected PCB temperature range of a power amp. How is this product tested and / or repaired with the heatsink in place? As with this demo board you cannot get to the pins on the IC. You can use a high tech plastic to make plates and receivers (like Delrin) to help regulate the clamping force across the whole IC, but this is very expensive and labor intensive in assembly. Please TI if you are reading this, give me an alternative package with the power pad on the bottom of the IC and it might actually have a chance to be purchased and go to production.

@JasonLeaman Год назад

Sweet..

@KissAnalog Год назад

Thanks my Canadian Friend;)

@sifatbhuiyan9019 3 месяца назад

Hello brother please help me !!!!!!!!! I have a TPA3255 IC and I want to make a pcb for it But in the datasheet of the IC has not shown the full diagram to make a Circuit For example pin number 18 is for reset but there has not shown how to connect to the circuit Please provide me the full diagram of TPA3255 IC ...

@KissAnalog 3 месяца назад

You bet - thanks for asking. I'd love to hear your progress. www.ti.com/lit/df/slar129a/slar129a.pdf?ts=1711863713153&ref_url=https%253A%252F%252Fwww.digikey.de%252Fde%252Fproducts%252Fdetail%252Ftexas-instruments%252FTPA3255EVM%252F7219409

@jj74qformerlyjailbreak3 Год назад

Do you think 6 ohm 250W resistive elements will work for a dummy load?

@filipesoares5400 5 месяцев назад

Around 220w RMS at 6ohm and 10% THD

@jj74qformerlyjailbreak3 5 месяцев назад

@@filipesoares5400 👍 that's about spot on. Thanks I forgot I asked this. 😂

@avguytx4361 29 дней назад

Ok, did I miss what the rating would be on this amp if it was rated like, lets say, an amp like the Yamaha A-S801? (an example) What about xx watts per channel @ 8-ohm from 20hz to 20khz @ 0.xx% versus these power ratings that are like cheap Pyramid car audio amps of the 80's and 90's.

@KissAnalog 29 дней назад

That is a fantastic question! I am staring a new series where I will do a deep dive any testing amps to see how they really perform. I have a stack of them, and I am starting with the Aiyima A07 Max that has had so much good press. Let's see how it measures;) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Pu8NFAFgwHU.html

@avguytx4361 27 дней назад

@@KissAnalog Ok, but again, how much power from 20 to 20k on an 8-ohm load, let's say at maybe .05% thd. You know...like legitimate amplifiers rate things.

@alexyurchenko3569 Год назад

Hey I got a question on powering a vehicle electronics while the battery is connected using a power supply. While troubleshooting electronics and the alternator isn't charging, the battery drains fast. How much current do I give it? It likely isn't regulated when it's jumper cables. I was thinking just add the normal charge current to the standby power draw when battery isn't connected. Am I right or will I blow something?

@KissAnalog 5 месяцев назад

Great question. It takes a lot of current - so adding a parallel battery might work if you PS doesn't have enough current. The cranking current is very high.

@yuhoyintony7125 8 месяцев назад

如果寫下測試結果在內文，我就清楚及看的明白結果了，如果可以，多謝作出評測及結論。

@KissAnalog 6 месяцев назад

Thank you! I will post the results next time;)

@dr100wconceptpoweramplifier 9 месяцев назад

personal comment on the use of sinewave signal - lets see what American standard is saying, in the FCT Title 16, part 432 - that so called “the amplifier rule”. This explained the “why” to use sinewave to have the average power in contrast to what other say like Music power, PMPO, ….whatever.. It would be nice (or appropriate) to re-test the TPA3255 with the 60 minutes pre condition with power 1/3 of its expected power before claiming the real power it can deliver to the load (just be careful of the distortion if 1% or 10%). I looks that Hifiers/Purist/audiophiler always respect 1% and never the 10% distortion, while headbangers love the 10% distortion. What do you think guys? Where is your distortion level to rate the real power?

@dr100wconceptpoweramplifier 9 месяцев назад

btw, we (my friends) audio hobbyist in the Philippines, if the DIY power amplifier cannot survive FCT title 16 Part 432, it goes into the trash (smile)

@KissAnalog 9 месяцев назад

Thanks for the great question. First I'd like to say that I thin the FCT Title 16, part 432 is a lot of legal speak that is poorly written and difficult to actually understand what it is saying. Is it written so poorly so that the manufacturers can wiggle out of anything written there? As an engineer writing a spec - I'd find that document difficult to find use in. It is not actually a standard - it is a regulation meant for legal purposes vs a standard meant for engineering design requirements. Standards are written clearly and much better to understand. This thing has full paragraphs with a single sentence. This is one reason the audio specs are so bad. IMHO I think it is valuable to know what power level can be held continuously, but I also think it is valuable to know what actual music power is as well. I think dynamic range is very real and important for audio. I'd like to come to some conclusions on what is valuable and derive a set of tests to help understand how good an amplifier can perform.

@dr100wconceptpoweramplifier 9 месяцев назад

@@KissAnalog Thank you so much for the insight. This topic seems always debatable but its nice to hear form different people who are working real hands on with Audio. I'd like tp comment that, FTC (sorry for my typo not FCT) - fedetal trade commission is my reference to have the average power the amplifier cand eliver to its rated load (unless I can learn other way to specify the power, like Music Power, PMPO, etc). and most importanly, how TI power output was measure. Thak you Sir and more power.

@cuongdoanmanh6888 Год назад

Can you rate the chip tpa3221?

@KissAnalog Год назад

Thanks I’ll see if I can find one. Do you know where I can get a board with one on it?

@cuongdoanmanh6888 Год назад

@@KissAnalog i own tpa3116, 3251 and 3221. I'm more impressed with 3221, however i need more power and wonder if tpa3255 is worth the upgrade. Technically 3221 is inferior to 3251 but in terms of listening experience, 3221 is very musical. Sorry for my bad English

@KissAnalog Год назад

Thanks for this information! Your English is great;) I'll look into these other TPA devices.

@cuongdoanmanh6888 Год назад

@@KissAnalog thanks for the knowledge and experience you shared, you have great measuring instruments!

@TheRattleSnake3145 9 месяцев назад

I missed how much power it made.

@hightttech Год назад

Sometimes old school, bead type thermocouples at your test points simplify life, and allow you to record and do math.

@KissAnalog Год назад

I agree! Type K thermal couples are great, but then I usually want a number of them and then the wires get messy;) I do like the IR temp probe to get measurements fast;)

@johnshaw359 Год назад

The trick is to build a 4ohm amp that halves its output into 8 ohms.

@KissAnalog Год назад

Thanks John - that would be one approach to be sure of the 4 Ohm performance.

@jstro-hobbytech Год назад

stuff got crazy here last week so i liquid cooled my tpa3255. 600watts per channel. hahahahaha

@KissAnalog Год назад

Sorry that Mother Nature thought that you needed the water cooling! Hope you are drying out.

@jstro-hobbytech Год назад

@@KissAnalog cold but dry. Still no power after a week.

@hoobsgroove Год назад

if you really wanna keep it cool just immerse it in deionised water in an aluminium box

@KissAnalog Год назад

Thanks! I love that idea! It would be a really cool marketing gimmick;) Pun intended;)

@hoobsgroove Год назад

@@KissAnalog I'm not being ironic you can immerse it in deionised water it's a insulator

@KissAnalog Год назад

No - I'm with you! We used big 50 gallon barrels to soak the heating elements used for loads when we tested the 10kwatt power supply used in the international space station. We would check the water level each day;)

@darrylfletcher2760 Год назад

These days China try’s to convince you that 70 RMS is 300w 🤦‍♂️

@KissAnalog Год назад

Thanks Darryl! It is crazy how specs can be twisted;)

@overbuiltautomotive1299 6 месяцев назад

comments vanishing are you holding them or more yt games

@KissAnalog 6 месяцев назад

Thanks for telling me. It must be some YT thing. That’s a bummer!

@peteb2 Год назад

Junctek ... an unfortunate name for a test generator!

@KissAnalog Год назад

Yes but I think they are changing it to Juntek which is what I think they started with.

@peteb2 Год назад

@@KissAnalog Hopefully so. It'd have it's earned respect restored then!

@MichaelBeeny Год назад

@@KissAnalog So it's not a load of SCHIIT then? At least we remember such product names.

@publicmail2 Год назад

Yea china is alway honest with specs, I hv not watched video yet, but guessing 40x2 rms 5%THD maybe 20-20k or just 1kHz 4 or 8ohms. They go peak to peak at 20%THD 1khz and then x 4, that'll sell and the world knows how we are about specs so it's business as usual. Far from the 70-80's FTC spec requirements.

@KissAnalog Год назад

Thanks and LOL You are so right, but this thing does put out some clean power - just not the level advertised.

@user-uc5vr8le7y 6 месяцев назад

This board is a poor implementation of tha tpa3255. It should be ice cold at 60odd watts per channel. These chips do 180w into 4ohms per channel at 48v. I know the chinese have struggled with the regulators on some boards. Perhaps they should just add extra voltage inputs and do away with the regulator.

@GeorgeWPush Год назад

never fans

@KissAnalog Год назад

Thanks!!

@jstro-hobbytech Год назад

you are done with this amp sir. now on to mr j a audio.

@KissAnalog Год назад

I am so close! I’ll get it in a box and do a final wrap up and show the measurements.

@jstro-hobbytech Год назад

@@KissAnalog keep it pg man. It's youtube here lol

@frankd.b.9233 Месяц назад

That cooler is a pile of junk, put something better on it together with good cooling paste

@KissAnalog Месяц назад

Yes - this heatsink could be improved for sure;)

@TwistTapeTechnology Год назад

...that's a lotta rambling...

@KissAnalog Год назад

Thanks for the feedback - sorry you didn't like it.

@jackhowardbourne Год назад

You could do with trimming down your content, it is a lot of Waffling on, hard to understand the point you're making

@KissAnalog Год назад

Thanks Jack! I’m trying to improve all the time, so thanks for your feedback.

@trevthea5781 Год назад

That's a bit harsh. I happen to like the easy going commentary. Lots of really good insights.

@KissAnalog Год назад

Thanks so much Trev!

@andyfreestone7616 9 месяцев назад

So much waffle, I gave up after a few minutes - just get to the point.

@KissAnalog 9 месяцев назад

LOL - I did get to the point;)

@MasterBlaster220 Год назад

Sorry but im a little confused. At 17 min. you say it gives 156 watts per channel into 4 ohms and later you say it delivers only 90 watts into 4 ohms.

@KissAnalog Год назад

Thanks for the great question! We were able to get higher power with the fan before the chip shut down to thermally protect. Otherwise we can get the lower power without fan and without time limits. This shows we can also get great dynamic power.

@MasterBlaster220 Год назад

@@KissAnalog Thank you! Im pretty poor right now and look for some cheap class D, mostly for fun. Got a linear supply with 500W transformer here and a 600W SMPS. I struggle between the 2092s based ones and the TPA 3255, but everything below 120W into 4 ohms isnt worth it for me. The great thing about the 3255 is it works on a single supply, but most cheap ones are too weak for my demands. My impression is that the very cheap ones have non original parts that dont deliver the power they should and others are a little more expensive and still depend on better cooling, but as long as tweaking is possible, thats great news. I would be interested if these boards deliver more power into one channel if only one is driven, since i want only one amp per speaker on the long run anyways, - it increases spatiality due to channel separation.