Hi, everyone. Got tpa3116 double chip board today and HP 90w adaptor 19v/4,5A. This board sounding much better in all cases than tpa3255+bt complete in case Iyama. More gain more bass& highs&trebles reproducing solid sounding from lowest volume. No doubt the unit tpa3255 I bought and shared here is not worthy 45$ I paid just because there are boards 8$ which sounding better. This is my personal opinion, how ever will proceed extra efgorts to make my tpa3255 sound loder, may be preamp will but&try . Think thise boards have different gains tpa3116 having higher gain thus louder even with low imput levels.
Attachments
Some small update , we are able to beat TI EVM by 10db (so under 0.001 THD+N) at 1Khz , 8R 2w to 100W . At 6.67Khz (worst case in class d amplifier) we are at 0.003 2W to 100W
This result will be improved further. I think that from a THD+N point of view , TPA3255 can equal the best amps out there (class d or class AB)
Changes made , clean PSU , capacitor changes in the LC filters , but more importantly improved PCB layout
This result will be improved further. I think that from a THD+N point of view , TPA3255 can equal the best amps out there (class d or class AB)
Changes made , clean PSU , capacitor changes in the LC filters , but more importantly improved PCB layout
Hi cdsgames,
Can you please provide a link to the post that this update is in reference to?
Thanks
Can you please provide a link to the post that this update is in reference to?
Thanks
Hi, everyone. Just thought about why so difference in bass between tpa3255 iyama and double tpa3116 boards even with 90W adaptor from HP, while tpa3255 fed by 1200W source.Tpa3116 contain 4000 mkF capacitors and tpa3255 only 1000mkF, can it be the reason? Just because not enough impulse of energy on board to push bass spikes on tpa3255? I am really afraid about nebours with 60% of volume with tpa3116 board via Canton SC-L.
I have looked again the lot description and it stated main power capacitor 63V /2200 mkF while the board equiped by 50V/1000mkF i.e. double less and no reserve in voltage. Think shoild be changed for more capacity. Any ideas?
I have looked again the lot description and it stated main power capacitor 63V /2200 mkF while the board equiped by 50V/1000mkF i.e. double less and no reserve in voltage. Think shoild be changed for more capacity. Any ideas?
Attachments
Last edited:
Hi Anatoliy
As Doc and i wrote you...NO....its not because the cap....i learned this too ..
first: its not the big fat black cap 1000µ ..its the small blue one (220µF)which should be 2x1800µF . (datasheet its 4700µ-we discussed this..) this caps on the rail should be act as super fast energy if the psu is not able to push quick current to the chips rail....
but your psu is able to deliver enough current (20A and more) so this can not be a problem...maybe there is a current limiter set?
my proposal is:
check your super PSU if there is a current limiter or something else
change the blue 220µF to 2x low ESR 1800µ/63V panasonic
chris
As Doc and i wrote you...NO....its not because the cap....i learned this too ..
first: its not the big fat black cap 1000µ ..its the small blue one (220µF)which should be 2x1800µF . (datasheet its 4700µ-we discussed this..) this caps on the rail should be act as super fast energy if the psu is not able to push quick current to the chips rail....
but your psu is able to deliver enough current (20A and more) so this can not be a problem...maybe there is a current limiter set?
my proposal is:
check your super PSU if there is a current limiter or something else
change the blue 220µF to 2x low ESR 1800µ/63V panasonic
chris
Oh, sorry mate. Perhaps I did not catch your hint properly sbout blue cap. Are you sure my tpa3225 board is btl mode?
Should replacement caps be installed paralleled? Guess they should be connected to each channel separately, but my design have only one. Have no idea how to check current limiter on my psu, think it only limit when exceed 20A+. Please advice and I will proceed with welding. The only thing how to fit these big caps there...
Should replacement caps be installed paralleled? Guess they should be connected to each channel separately, but my design have only one. Have no idea how to check current limiter on my psu, think it only limit when exceed 20A+. Please advice and I will proceed with welding. The only thing how to fit these big caps there...
no problem mate....
just try 2 caps in parallel.exactly where the 1 blue cap is. watch out the polarity ...eletrolytic caps has a black mark where the minus pole is..so solder exactly like the blue on your board
BTL mode...sorry i checked the traces but i am not an expert...look likes mine...so should be ok..
chris
Doctormord , those are just preliminary findings . We modified the PFFB using opamps , inductors were changed to correct wire and of course we used every trick we learned in our volt ( our tpa3118 beats EVM by 12-18db)
The 6.67 is nothing like I see in the pffb datasheet , it looks more like the 1Khz
Of course , layout is important , chemistry of caps etc...pay a LOT of attention to PSU (clean)
We are trying to beat the Ncore (tested at 0.0005THD+N)
Still lots of work , but I think that this IC will equal or beat it.
I just found a better version of the AIYIMA TPA3255.
AIYIMA TPA3255 Bluetooth 5.0 Sound Amplifier Audio AMP 325W*2 Stereo Class D Amplificador Power Amplifiers DAC PCM5102 Decoder
It has PCM5102 and QCC3003 and look like to have better cap.
But no changed supply rail caps. But must be better for modding. I hope
AIYIMA TPA3255 Bluetooth 5.0 Sound Amplifier Audio AMP 325W*2 Stereo Class D Amplificador Power Amplifiers DAC PCM5102 Decoder
It has PCM5102 and QCC3003 and look like to have better cap.
But no changed supply rail caps. But must be better for modding. I hope
Last edited:
I just found a better version of the AIYIMA TPA3255.
AIYIMA TPA3255 Bluetooth 5.0 Sound Amplifier Audio AMP 325W*2 Stereo Class D Amplificador Power Amplifiers DAC PCM5102 Decoder
It has PCM5102 and QCC3003 and look like to have better cap.
But no changed supply rail caps. But must be better for modding. I hope
if you buy and start modding it would be nice to have a seperat thread.
@BT i read that the Apxt module should be the best. if i rememeber right at the TPa3116 module "doc" give some advices to solve the hiss problems there...
chris
Looks like mine but with BT5 version, should be better but still less bass
It is not easy to get low Esr caps 63v/1800 in the middle of nowhere I am living now. There are some caps available in local shops but seller s have no idea about low esr/ impendance of capacitor s they sell just voltage and capacity with no data about esr. Thus no progress for now. Booking via internet and waiting think no worth efforts. Will try another board described here with elna big caps.
which one do you get?...give us something we can look -
the caps should be valid for SMPS...maybe this helps your shop guy....
the voltage rating is important = 63V...the rest we can do with paralleling the caps
chris
I just found a better version of the AIYIMA TPA3255.
AIYIMA TPA3255 Bluetooth 5.0 Sound Amplifier Audio AMP 325W*2 Stereo Class D Amplificador Power Amplifiers DAC PCM5102 Decoder
It has PCM5102 and QCC3003 and look like to have better cap.
But no changed supply rail caps. But must be better for modding. I hope
According to the QC300X datasheet, the QC3003 does not implement APT-X, so only SBC/AAC/MP3 link is available.
Link:
https://www.qualcomm.com/media/documents/files/qcc300x-family-product-brief.pdf
Btw. QC3003 is "same" as CSRA63210.
Hi, everyone. There was a consider here that my super psu 1200w can limit the current and it might be the reason of limiting my tpa3255. Actually iwas very sure that psu with 50v/1200w should deliver big reserve in power supply . To define it I connected tpa3255 to HP notebook adapter 19,8V/90 W and found some improvement in sound increase. The tpa3255 couldnt start both channels from the first attempt, i connected one wire channel then second. Guess some other kind of protection prevented it to start with low voltage. Anyway it started and wow it sounded very nice endeed even with 19,8 V. So, now need to eliminate my psu current limiter. Think just add capacitors between psu and tpa3255 , think 10000 mkF would be enough to see the progress. What do you think, mates?
hi anatoliy
fine that you find the reason of limiting the current.
but no the laptop bricks are build to be cheap and deliver "constant" current into the load, more or less its a slow regulation circuit. so an additionally cap doesn't help here in the final solution.
the class D amp must have a good, very good regulated smps with the correct "designed" power what you need and calculate. therefore a big fat cap bank, e.g. 1000000µF is not needed, because the smps regulation circuit is not able to regulate this "request" correctly -- voltage overshoot!!!
a very good explanation is here:
https://www.diyaudio.com/forums/class-d/104822-favorite-threads-posts-class-forum-2.html#post5683013
i personal use original mean well 150W-24 (set to 28V) - about 20 euros or a mean well 350W-36V 50 euros for my needs
BTW...its not 10000mF...its 10000µF...a big difference!
chris
fine that you find the reason of limiting the current.
but no the laptop bricks are build to be cheap and deliver "constant" current into the load, more or less its a slow regulation circuit. so an additionally cap doesn't help here in the final solution.
the class D amp must have a good, very good regulated smps with the correct "designed" power what you need and calculate. therefore a big fat cap bank, e.g. 1000000µF is not needed, because the smps regulation circuit is not able to regulate this "request" correctly -- voltage overshoot!!!
a very good explanation is here:
https://www.diyaudio.com/forums/class-d/104822-favorite-threads-posts-class-forum-2.html#post5683013
i personal use original mean well 150W-24 (set to 28V) - about 20 euros or a mean well 350W-36V 50 euros for my needs
BTW...its not 10000mF...its 10000µF...a big difference!
chris