If you mean a circuit diagram when you write "the TPA3255 China schema", the low power parts are found appended to posting #303 of this thread: What is wrong with TPA3255?
It must be the inflation that affects more-and-more details of our life. When the truth is only a matter of the perception of those listening, the absolute value may become "fake news".
As can be concluded from this, always be skeptical when it sounds less likely and apply a good operational margin. The module discussed is really cheap for such a performance and is most likely sold by a trading company not well aware of the technical realities.
Just stunning beauty. I understand why Kurt is smiling. And, no EDF bill to pay.
Yes, absolutely stunning. Thank you FauxFrench and doctormord for the information on the voltage converters.
They've said they'll have them back this week, so that's good.
Now for my stupid question. How would I use that board as an finished amp, since it doesn't have a way to control the gain, ie no volume pot. Is it just running at a fixed gain all the time?
Do I need a separate preamp, and if so what cheap Chinese board with amazing specs do people recommend to do that?
How do I find out what gain the board is (I was thinking about the je audio tpa3255 board), and how to calculate what kind of preamp to use? I saw that the tpa3255evm uses NE5532 opamps and there are NE5532 boards available on ebay but not exactly sure what I'll need or if there are better options.
I'm not really a fan of having everything set up with massive gain with no physical volume knob! My Focusrite 6i6 audio interface has a knob on the breakout box for the monitor outputs, but I'd rather have a control on the preamp or amp as well.
Hi All,
Just bought a new TPA3255 2.1 board from
2018 TPA3255 2.1 Amplifier Board -in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
2018 TPA3255 2.1 Amplifier Board -in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group to Clipboard"]2018 TPA3255 2.1 Amplifier Board
2018 TPA3255 2.1 Amplifier Board -in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group to Clipboard[/URL]
The amp have 3 knobs. One for bass and only affect the subwoofer channel. One knob for treble which only affect the stereo channel.
And a master volume knob.
My setup is using Visaton FR58 + GF200 8ohm
Power adapter is 48v 3a
After listening to more than 24hours , I notice the amp is very clean and definitely a major improvement compare to TPA3116/8 , TDA7498 and even STA326
But there's loud pop when turn on and that's my complain. Turn off doesn't have pop
Suggestions for improvement/mod:
- instead of bass circuit. A simpler low pass filter with volume knob is enough. Less component
- remove treble knob ? Less component
- can use smaller input capacitor value as high pass filter
Note: the step down regulator use for 12v is XL8005
Hope it help those who looking for this amp
Just bought a new TPA3255 2.1 board from
2018 TPA3255 2.1 Amplifier Board -in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group
2018 TPA3255 2.1 Amplifier Board -in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group to Clipboard"]2018 TPA3255 2.1 Amplifier Board
2018 TPA3255 2.1 Amplifier Board -in Amplifier from Consumer Electronics on Aliexpress.com | Alibaba Group to Clipboard[/URL]
The amp have 3 knobs. One for bass and only affect the subwoofer channel. One knob for treble which only affect the stereo channel.
And a master volume knob.
My setup is using Visaton FR58 + GF200 8ohm
Power adapter is 48v 3a
After listening to more than 24hours , I notice the amp is very clean and definitely a major improvement compare to TPA3116/8 , TDA7498 and even STA326
But there's loud pop when turn on and that's my complain. Turn off doesn't have pop
Suggestions for improvement/mod:
- instead of bass circuit. A simpler low pass filter with volume knob is enough. Less component
- remove treble knob ? Less component
- can use smaller input capacitor value as high pass filter
Note: the step down regulator use for 12v is XL8005
Hope it help those who looking for this amp
I am not sure what the gain is for the 3e board to be honest, but the owner is a user here so you can ask him directly. But if you're using your 6i6 as a frontend that already provides a preamp and you don't really need anything else...
Hi
i just measured the Chinese YJ TPA3255 board and its about 27db GAIN. my TI3251EVm board has about 26db.
so its very loud
. do not use fixed output from a Cd player or DAC.... its about 2,1Vrms over RCA as FauxFrench wrote. for this boards no preamp is needed. i personally use the amp over pc (tidal, foobar..etc...) and my DAC (RCA - connnection) to regulate the volume and it works fine
so my interpretaion is that the 3e board will have about the same gain.
chris
Hi, I developed 2 version amp TPA325x
Now build new version, are there any questions?
Gerbers after testing will be available to all.
Conditions:
1) Output inductors based on RM8 Epcos
2) 1st stabiliяer - LM5007 or use 12v output from PSU
Your wishes?
Sorry for my bad English))))
Now build new version, are there any questions?
Gerbers after testing will be available to all.
Conditions:
1) Output inductors based on RM8 Epcos
2) 1st stabiliяer - LM5007 or use 12v output from PSU
Your wishes?
Sorry for my bad English))))
Attachments
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doctormord, FYI, not shielded LLC inductor or combo-trafo makes near impossible EMC compliance, and hence legal distribution. Picture irs20957 shows unshielded trafo and one winding of the common mode choke was placed exactly against of trafos gap, I'm ready to bet that conducted emissions test will be even better without that common mode choke.
Question about PFFB,
Has there been tests about the sonic (subjective) impact of PFFB ? I understand that it improves THD figures, especially with not so perfect inductors, but I would like to know if:
- somebody experienced some sonic/subjective drawback (better without PFFB than with it) ?
- if it still has benefits if using "reasonable" quality coils like the ones used in the discussed designs in this thread ?
I have to decide whether to include it or not in my TAS3251 design, and the PFFB adds to the size of the BOM and complexity of the circuit.
Best regards,
JMF
JM
Has there been tests about the sonic (subjective) impact of PFFB ? I understand that it improves THD figures, especially with not so perfect inductors, but I would like to know if:
- somebody experienced some sonic/subjective drawback (better without PFFB than with it) ?
- if it still has benefits if using "reasonable" quality coils like the ones used in the discussed designs in this thread ?
I have to decide whether to include it or not in my TAS3251 design, and the PFFB adds to the size of the BOM and complexity of the circuit.
Best regards,
JMF
JM