Did some measurements of fault pins. FAULT goes low and CLIP stays high. OC_ADJ resistor is 22k so CB3C. Seems some kind of overcurrent protection.. I need to toggle RESET to make it work again. Once I managed to only shut down one channel. Speakers are 4 ohm and working okay on other amps, eg tpa3116.
🤔 Obviously, all these cards cannot produce the announced power...
I have often noticed, me too, the loss of a channel, after having pushed the volume ...
I did not have this problem with the 3e audio board ...
Non-compliant TPA ...which should have been scrapped or bad designed from the card?
Now... i try Ma5332! ....It's a tpa killer !
I have often noticed, me too, the loss of a channel, after having pushed the volume ...
I did not have this problem with the 3e audio board ...
Non-compliant TPA ...which should have been scrapped or bad designed from the card?
Now... i try Ma5332! ....It's a tpa killer !
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I think only three ready made exist. The very expensive eval board. One without PSU and one with integrated PSU
hi all. I also purchased an improved amplifier board on tpa3255, at first I wanted all the electrolytes, but for now I left it as it is. There was a thermal pad under the radiator, I replaced it with thermal paste. now I assembled a DIY amplifier on this board, here is an example -
after I measured the damping coefficient, it turned out to be very low, about 20. any suggestions about this?
Good day Alex.
I've been playing around with this amplifier board too. Esr wise, all the factory installed capacitors measure very well - a little better than the Panasonic fc's /elna caps I bought to replace them. The exception are the 10uf 16v gold caps that measure at 2.52 on average. The three x 1000uf 50v parallel caps (according to the pcb) are worthy of your attention however. These caps (2x1000uf and 1x560uf - as installed at factory) actually measure up as 2x770uf and 1x420uf (about 1960uf in total) total). As I bought two of these boards so it was easy to compare between the 2. I found that by replacing the middle 560uf/50v cap with the same 1000uf donated from the second board there was a substantial sound improvement, without any further changes. Everything sounds more cohesive and the improvements in sound separation can't be overstated. Highly recommend anyone playing with this board replace that skinny 50v cap as a proper baseline before commencing any further changes.
Thank you very much, this is valuable information, I will try. Yes, one more thing I noticed, when powered by a 42 volt unit, the amplifier heats up more than from 24 volts, just observations.
Проверил на своей плате, конденсаторы на 50 вольт изначально стоили 2 на 1000мф и один на 470мф
Please post in English.I bought a used 3e audio 3255 asssemly, someone else built following the ieee article
https://spectrum.ieee.org/build-your-own-professionalgrade-audio-amp-on-the-sort-of-cheap.
BTW I would love to have a copy of the full article if anyone has the pdf to share.
I'm comfortable soldering and/or molex connecting my way, but no PCB design, not an EE.
I have my AMP with input from laptop, 1/8" jack split to RCA. Output to a pair of Bagend MM8 monitors and Bagend Powered Sub.
Playing with VLC, volume set to apx 40% and it faults, with one channel cutting out.
The entire unit is out in my barn, so at this time of year it's cold and the fault occurs with any volume applied.
Leaving at 40% as soon as a passage bumps output it faults.
I have no idea where to start, but I'd like to fix this or else I'll have to start over.
https://spectrum.ieee.org/build-your-own-professionalgrade-audio-amp-on-the-sort-of-cheap.
BTW I would love to have a copy of the full article if anyone has the pdf to share.
I'm comfortable soldering and/or molex connecting my way, but no PCB design, not an EE.
I have my AMP with input from laptop, 1/8" jack split to RCA. Output to a pair of Bagend MM8 monitors and Bagend Powered Sub.
Playing with VLC, volume set to apx 40% and it faults, with one channel cutting out.
The entire unit is out in my barn, so at this time of year it's cold and the fault occurs with any volume applied.
Leaving at 40% as soon as a passage bumps output it faults.
I have no idea where to start, but I'd like to fix this or else I'll have to start over.
