somebodyelse
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I'd look at that, and U002 in the block above that one.
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wondom bru5 pc dsp configurable TPA 3255 "300w x 2" mini amplifier
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Roland68
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There's more to it than that.
The top one is a voltage regulator or transistor for it, the two SOIC8s are probably high frequency regulators.
Can you take photos of the components where you can read the labels?
Yes, good catch together with @somebodyelse . I do think however that these might be cascaded behind one of the 2 DC/DCs. Hard to see from the pics.
I also know the very basics… maybe a tad more: enough to become literally dangerous!
As @Roland68 indicated, the components markings and, in my experience, Googling them around, are a good indication of what you’re dealing with.
Same with the markings on the PCB: for example on your initial picture,
These 4 components are referenced D3, D4, D5, D6 on the PCB. I can’t read the actual marking on the components, but I bet these are the 4 diodes (as “Dx”) of the bridge rectifier, not the voltage regulator…
Now, to figure out how all of these components fit together and what is their likely function… You need the experts!
gnat_leader
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I'll see if I can take some more pics...
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gnat_leader
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Here are some new pics where you can read the chip labels.
SS16F (60V Schottky Diodes?)
XL7005A (DC/DC converters?)
LM317G Voltage regulator: https://www.ti.com/lit/ds/symlink/lm317.pdf
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This is probably the important one. It can input up to 80V, so it's super wide-range input. Very useful, but not very common.
You'll need to find out if the LM317 is cascaded behind one of the DC/DCs. If not, it lowers the max voltage to 37V.
gnat_leader
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Those are marked "SS16F" 60V Schottky Diodes ?I also know the very basics… maybe a tad more: enough to become literally dangerous!
As @Roland68 indicated, the components markings and, in my experience, Googling them around, are a good indication of what you’re dealing with.
Same with the markings on the PCB: for example on your initial picture,
View attachment 406081
These 4 components are referenced D3, D4, D5, D6 on the PCB. I can’t read the actual marking on the components, but I bet these are the 4 diodes (as “Dx”) of the bridge rectifier, not the voltage regulator…
Now, to figure out how all of these components fit together and what is their likely function… You need the experts!
Based on this limited info, probably yes. The diodes are there to limit voltage to 60V. So that should be the real-world limit.
gnat_leader
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The TPA3244 board looks exactly the same as the TPA3255 board, I mean the power supply parts.
I wonder if they used all the same parts and just used a couple different resistores to change the LM317G regulator's output?
That would save mfg costs I think. Make any sense that they would do this?
(see the TPA3255 board pic below with the same LM317G and looks like exact same layout)
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gnat_leader
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meaning could the difference between these two amps just be that voltage regulation difference and mounting the TPA3255 chip on the bottom of the PCB with the added alum plate for heat transfer to the case? Note the 3255 version can use a power supply up to 48 volts as per the manual: https://files.sure-electronics.com/download/BRU5_User_Manual_20240104.pdf
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ChatGPT seems to think that it is possible to make a board that can accommodate both chips so it might be possible that it’s the same board with slightly different BOM.
so it might be possible that it’s the same board with slightly different BOM.
gnat_leader
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well if ChatGPT said it, it must be trueChatGPT seems to think that it is possible to make a board that can accommodate both chips
Roland68
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That doesn't make sense. The coordination alone to save costs in production would be far too complex. There isn't much to save there either.
LM317/337 voltage regulators are absolutely mass-produced and the most commonly used regulators after 78/79XX, not just in the audio sector.
gnat_leader
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On the other hand, why would you re-design a board if you don't have to? It's obvious how similar the requirements are.
I think there'd be more coordination/management needed the more parts you have to source and keep in stock.
Point is, it's obvious these two amps are nearly the identical save for the TPA chips.
Why have two then, why not just have the 3255 higher power amp?... maybe they sound different?... don't think anyone has A-B them.
Roland68
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I wasn't referring to the circuit board, but it doesn't really matter whether the circuit board is the same or different.
It may well be that the circuit board is the same, but it has no effect on the price. Such parts are ordered in batches as needed and assembled directly. Such manufacturers receive circuit boards that are already assembled with SMD and only assemble the large/through-hole components in-house.
Such production runs according to a very specific pattern, otherwise it's not worth it. Look at what such devices cost and remember that the manufacturer only gets about 50% of that.
The main reason to create a single board for two products would be to lower NRE and possibly certification costs.
Roland68
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I have to apologize to both of you, it seems to be a board for TPA3244 and 3255.
I was a little suspicious because it is unusual these days and the two TPA ICs have different pin assignments on their connections. I had overlooked that there are two different pads for the TPAs, on the top for the 3244 and on the bottom for the 3255.
Ashes on my head.
BrodaWawa666
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My amplifier doesn't save the settings. When i put out the USB and put it in again, the amplifier has a flat "firm" settings.
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