Why is it no high fidelity? I have a Sinewave TPA3251 and that is definatly high fidelity. Is there something wrong with this board?
I don't think it can work as advertised with 50V PSU, max operating voltage being 40V, absolute max voltage being 45V. But maybe different ad mentions different max voltage.
Here is the blackboard - not much info
TPA3255 300W +300W DC50V 3900UF/100V*2 Channel Digital Power Amplifier Board | eBay
And the blue board
Class D TPA3255 MINI HIFI AUDIO Digital Amplifier Board 300W + 300W DC50V-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
If you look closely, they are not identical. I'm not an engineer, so I can't really help on the technical stuff
TPA3255 300W +300W DC50V 3900UF/100V*2 Channel Digital Power Amplifier Board | eBay
And the blue board
Class D TPA3255 MINI HIFI AUDIO Digital Amplifier Board 300W + 300W DC50V-in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
If you look closely, they are not identical. I'm not an engineer, so I can't really help on the technical stuff
Both picture LM2575 S, 40V max operating voltage, 45V absolute max voltage.
Both spec/mention DC50V PSU. Something is wrong? I would think so.
Both spec/mention DC50V PSU. Something is wrong? I would think so.
The LM2575 on the cheap boards have the same function as the LM5010 on the TI EVM boards? The LM5010 is capable of 75 volt input!
Silkscreen label indicates HV version, high voltage version, that would function and would not be damaged by 50V. But just like the 220uH inductor pcblabel at a 22uH inductor, the HV label on pcb has an actual 2575S on pcb, non HV.
The 2575 switches at outputfilter peaking frequency, the 5010 switches much faster.
The 2575 switches at outputfilter peaking frequency, the 5010 switches much faster.
YJ website price is $38 for 3255. For YJ3116 website price was $29, "quickly" followed by offers on Ebay for as low as $9. For 3255 that could mean $15-$20 in near future ???
So this will be the board people buy 😀
So this will be the board people buy 😀
Their published THD-curves are certainly impressive. But I do not believe this is due to discrete design instead of integrated op-amps.
Thats correct. But THD curves don't say anything about sonics (unless they are really bad)
Some believe that it's the parasitic elements in op amps that are the main issue to bad performance compared to discrete designs.
Personally I am not sure, but it would be nice to have something to choose from.
Some believe that it's the parasitic elements in op amps that are the main issue to bad performance compared to discrete designs.
Personally I am not sure, but it would be nice to have something to choose from.
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Besides the different power range there are distinct differences:
- TPA32xx require additional 12V supply - TPA31xx do not
- TPA32xx produce less distortion compared to TPA31xx
- TPA31xx have a programmable gain - TPA32xx are fixed
- TPA32xx maybe configured as SE or BTL outputs - TPA31xx deliver BTL exclusively
- TPA31xx have differential inputs - TPA32xx do not - datasheet is misleading here!
I think they have a bigger problems than input stage.
3e-audio is more or less OK working fine all the way to hard clipping but the chipper boards are shutting down one channel even with mid range volume.
They need some mods for sure including decoupling power caps and input filters.
As far as input stage I would use OPA2604AU...
Thanks, Voltwide.
I guess the 325x must be much better than 311x chips on listening tests too. Wonder if a A-B comparison has been done by anyone ?
I guess the 325x must be much better than 311x chips on listening tests too. Wonder if a A-B comparison has been done by anyone ?
I tried TPA3116D2, TPA3251 and TPA3255.
The biggest difference is power. I wouldn't use TPA3116 with more than 20 W and TPA3255 with more than 100 W.
TPA325X sounds a bit more natural to my taste but need much better power supply.
TPA3116 boards are much more stable (if you set it up right) and 10 times cheaper.
I guess the preference depends on application.
The biggest difference is power. I wouldn't use TPA3116 with more than 20 W and TPA3255 with more than 100 W.
TPA325X sounds a bit more natural to my taste but need much better power supply.
TPA3116 boards are much more stable (if you set it up right) and 10 times cheaper.
I guess the preference depends on application.
emedia4u,
Thanks for sharing your listening impressions. Were you comparing your own amp creations, TI EVM's or pre-built amps from Asia? Also, did you use full range speakers?
I only ask, because I haven't built my doctormord TPA3255 amp yet. I bought two boards with the possibility of building two PBTL amps for a dual mono setup. I am very pleased with my gmarsh Wiener 2.0 TPA3118 PBTL amps powered by my modified Astron RS-12A regulated linear power supply. This amp can compete with my modified Dynakit Stereo 35 and McIntosh MC240 tube amps driving my modified Klipsch Forte II floor standing speakers. It also does just as well as the Dynakit Stereo 35 driving my KEF LS50 monitors. I'm talking about warm midrange detail, a holographic soundstage and great natural tone here, not just SPL. I was only able to attain this level of performance through adjusting the switching frequency and gain in BD mode. I'm not aware of any pre-built TPA31xx or TPA325x amps that offer this ease for adjustments.
Going with the TPA3255 PBTL route, I'll start with one or two regulated switching power supplies. I really need to get my lab setup again to build these amps. I even have a toaster oven to reflow the solder paste.
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