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Shui Yuan Audio TPA3255 Modification Thread
Shui Yuan Audio TPA3255 Modification Thread
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Old 12th September 2021, 09:12 PM   #371
mamocel is offline mamocel  France
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Hi, use a dual coil woofer ....
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Old 13th September 2021, 08:44 AM   #372
bushellj is offline bushellj  United Kingdom
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Quote:
Originally Posted by denbret View Post
No it is not possible with this chips. To increase or double the power (with low impedance) it takes a version with double chips in PBTL mode. This model is not available in double PBTL

The TPA3255 Chip can be used in three modes.

4 x SE Channels

2x BTL Channels

1 x PBTL Channels.

It does not require two chips for PBTL. It does however require a PCB with the necessary circuits to configure in the different modes. See TI Data Sheet

https://www.ti.com/lit/ds/symlink/tp...ct%252FTPA3255
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I provide PA equipment for Charities and local Clubs and Societies for their meetings inc. ChudFest.
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Old 13th September 2021, 01:43 PM   #373
denbret is offline denbret  Canada
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Quote:
Originally Posted by bushellj View Post
The TPA3255 Chip can be used in three modes.

4 x SE Channels

2x BTL Channels

1 x PBTL Channels.

It does not require two chips for PBTL. It does however require a PCB with the necessary circuits to configure in the different modes. See TI Data Sheet

https://www.ti.com/lit/ds/symlink/tp...ct%252FTPA3255
Yes I know the specifications well (SE, BTL, PBTL),
I forgot to mention that it is for a PBTL stereo.

2 chips PBTL for stereo mode at maximum power.

Last edited by denbret; 13th September 2021 at 01:46 PM.
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Old 14th September 2021, 04:31 PM   #374
ernperkins is offline ernperkins  United States
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Quote:
Originally Posted by MalleMike View Post
I believe I found possible evidence of cheating on the Shui Yuan boards which I just received.

They are equipped with two "Nichicon 2200uf at 63v"capacitors . Their size is 18mm diameter by 30mm height. so:

I have searched Google and any Nichicon capacitor I can find with 2200uf/63v/18mm diameter is 35mm in height so it appears that Nichicon does not make those with only 30mm no matter what series . The search included Nichicon´s own website for good measure ! I will ask Nichicon if they make or made any caps with the above measurements but only 300mm height.

So my assumption : if Nichicon does not make them then Shui Yuan cannot put them on anything they make .

Since the boards sound fine and the price is very low and if you want to use them above 35 volts my recommendation would be to change all electrolytic caps on them for peace of mind and use the ones you take out for other lesser purposes . I will change them anyways . It will set you back by about 10 euros per board for capacitors , plus whatever you decide to spend on op-amps which I will replace with LM4562 as well , see what happens............
I just received the "deluxe" version of this amp with the LME49720NA op-amps, Nichicon FW 2200uF/63v caps and Wima caps. I measured the height of the Nichicon caps and they are 35 mm. My "basic" version amp has 30 mm high caps.
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Old 15th September 2021, 07:34 AM   #375
UAN is offline UAN  Ukraine
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Hello, ernperkins.
Colleague, please share your impressions of the sound of the updated board. And compare the sound to the original board.

Last edited by UAN; 15th September 2021 at 07:44 AM.
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Old 15th September 2021, 03:15 PM   #376
ernperkins is offline ernperkins  United States
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I first plan on doing distortion tests on both boards at various power levels. I honestly don't expect to see any significant differences, but we'll see. Then I plan on doing a double-blind listening comparison of the boards. Will probably be a couple of weeks before I'm ready to post results.
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Old 15th September 2021, 03:52 PM   #377
UAN is offline UAN  Ukraine
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Serious approach, I look forward to your report.
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Old 16th September 2021, 12:55 PM   #378
rrobot is offline rrobot  Australia
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Quote:
Originally Posted by ernperkins View Post
Then I plan on doing a double-blind listening comparison of the boards. Will probably be a couple of weeks before I'm ready to post results.
double blinded no less! Impressive commitment to an evidence based approach. Await the results with interest!
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Old 26th September 2021, 09:16 PM   #379
MalleMike is offline MalleMike  Spain
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To rrobot....


To get the boards mounted vertically sideways what I do is get an aluminum cut-off from some place making aluminum windows/doors then cut that to size with an angle-cutter /stainless steel disc which is only 1mm in thickness , then machine it with file and drill to the exact size and lenght I need , base 40 mm , vertical plane 75 mm and lenght 120 is what I do. Then mount the board with spacers to allow for the electrolytic caps which go between the board and the aluminium-angle .

But of course one could simply use two angles only . The advantage of my solution is sturdyness and easy mounting of the caps which can be glued onto the aluminium so be totally inmobilized with respect to the PCB but without touching that.
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Old 27th September 2021, 05:35 AM   #380
Denis 974FR is offline Denis 974FR  Reunion
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Hello everyone,
It's been more than me that I did not come to see what is happening on the side of the suiyuan audio 3255, I remained a modification of change of the op with a OPA 1656 and condos by nichicon 4700uf-63v ...
what about the different PO possibilities?
you therefore advise to change the wima ...
what type of food is ultimately best suited?
I had selected a DC48V@6.5A
Alimentation de commutateur HIFI 250W, DC300V0.6A + 12.6V4A + 6.3V4A pour amplificateur a Tube Audio | AliExpress
Is there anything else?
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