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
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!
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;)
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: ruclips.net/video/eybcVbWgFdA/видео.html
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.
Thanks for the feedback! I like Michael's work. What was the load resistance that he used to get this. I found it could do 100 Watts per channel with a 4 ohm load with a small fan.
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?
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?
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 .
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.
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.
@@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.
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!
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?
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?
@@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. 👍
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.
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.
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;) ruclips.net/video/Pu8NFAFgwHU/видео.html
@@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.
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?
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.
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;)
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?
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)
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.
@@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.
@@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
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 ...
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
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;)
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.
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.
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.
@@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.
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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
Thanks Glen! I appreciate you!
Mr. Beeny is great, lots of valuable content.
Yes I agree;)
Thanks Rob, cheque in the post lol
We electronic types must be part rabbit... We go down rabbit holes pretty often. 😁
Thanks for the video!
LOL that is so true! Wait was that a squirrel;)
HI EDDIE, You do a great job explaining the information and also making it very interesting and Knowledgeable. Thank you 😃👏😁👍
So nice of you! I appreciate you!
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?
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!
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;)
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。
Thanks it does seem to be a great value. What do you think would be a good input board?
So do you think that the 300x2 power rating is a bit of embellishment? Or, do you think that is a dynamic rating?
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: ruclips.net/video/eybcVbWgFdA/видео.html
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.
Thanks - I'll have to do a video to show this. Have you seen this video? ruclips.net/video/eybcVbWgFdA/видео.html
is that the Aiyima A07?
I recall Michael felt that this amp was good for about 65 useful watts
Thanks for the feedback! I like Michael's work. What was the load resistance that he used to get this. I found it could do 100 Watts per channel with a 4 ohm load with a small fan.
@@KissAnalog 8 ohms from memory
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?
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?
@@KissAnalog resistance measurement, thanks!
Wich amp-board would you recommend me for a powerful speaker like the Precision Devices PD.186/3 or the PD.153ER/2 ?
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 .
Tpa3255*8channel
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.
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.
@@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.
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!
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?
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?
@@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. 👍
Thanks for pointing that out. I need to pay attention to that;)
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.
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.
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;) ruclips.net/video/Pu8NFAFgwHU/видео.html
@@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.
Hi! I am a bit confused about the wiring. I want 600w in mono. How should I connect the speaker wires? Thanks in advance
Get a 3255 amp that has DIP switches for PBTL mode (mono), and short the speaker outputs so L+ is shorted to R+ and Lground is shorted to Rground.
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?
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.
I missed how much power it made.
Sometimes old school, bead type thermocouples at your test points simplify life, and allow you to record and do math.
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;)
Do you think 6 ohm 250W resistive elements will work for a dummy load?
Around 220w RMS at 6ohm and 10% THD
@@filipesoares5400 👍 that's about spot on. Thanks I forgot I asked this. 😂
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?
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)
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.
@@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.
Can you rate the chip tpa3221?
Thanks I’ll see if I can find one. Do you know where I can get a board with one on it?
@@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
Thanks for this information! Your English is great;) I'll look into these other TPA devices.
@@KissAnalog thanks for the knowledge and experience you shared, you have great measuring instruments!
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。
Thank you! I will post the results next time;)
The trick is to build a 4ohm amp that halves its output into 8 ohms.
Thanks John - that would be one approach to be sure of the 4 Ohm performance.
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 ...
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
stuff got crazy here last week so i liquid cooled my tpa3255. 600watts per channel. hahahahaha
Sorry that Mother Nature thought that you needed the water cooling! Hope you are drying out.
@@KissAnalog cold but dry. Still no power after a week.
These days China try’s to convince you that 70 RMS is 300w 🤦♂️
Thanks Darryl! It is crazy how specs can be twisted;)
if you really wanna keep it cool just immerse it in deionised water in an aluminium box
Thanks! I love that idea! It would be a really cool marketing gimmick;) Pun intended;)
@@KissAnalog I'm not being ironic you can immerse it in deionised water it's a insulator
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;)
Sweet..
Thanks my Canadian Friend;)
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.
Thanks and LOL You are so right, but this thing does put out some clean power - just not the level advertised.
comments vanishing are you holding them or more yt games
Thanks for telling me. It must be some YT thing. That’s a bummer!
Junctek ... an unfortunate name for a test generator!
Yes but I think they are changing it to Juntek which is what I think they started with.
@@KissAnalog Hopefully so. It'd have it's earned respect restored then!
@@KissAnalog So it's not a load of SCHIIT then? At least we remember such product names.
you are done with this amp sir. now on to mr j a audio.
I am so close! I’ll get it in a box and do a final wrap up and show the measurements.
@@KissAnalog keep it pg man. It's youtube here lol
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.
never fans
Thanks!!
...that's a lotta rambling...
Thanks for the feedback - sorry you didn't like it.
That cooler is a pile of junk, put something better on it together with good cooling paste
Yes - this heatsink could be improved for sure;)
You could do with trimming down your content, it is a lot of Waffling on, hard to understand the point you're making
Thanks Jack! I’m trying to improve all the time, so thanks for your feedback.
That's a bit harsh. I happen to like the easy going commentary. Lots of really good insights.
Thanks so much Trev!
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.
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.
@@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.
one simple question but 46 min mumbling not comin to the point
Sorry - you were not able to follow. Maybe the answer wasn’t as simple as you hoped for.
So much waffle, I gave up after a few minutes - just get to the point.
LOL - I did get to the point;)