Are these boards ready to use (with the addition of a power supply) or is this just a piece of a bigger puzzle?
Pretty much PSU and attach cables. Might need to solder some things depending on the configuration (bridged vs single-ended).
Obviously packaging in a case/etc is on you as well.
Obviously packaging in a case/etc is on you as well.
No soldering required with mine. Switching from single ended to differential/balanced inputs was accomplished with jumpers.
Attach input cables, speaker cables and a power supply and you have music.
Attach input cables, speaker cables and a power supply and you have music.
SE output requires desoldering some tabs on the bottom of the board, FYI. Not on the input side. 🙂
I guess I don't understand that completely.
If these are 2-channel boards, does 2 channels mean 2 completely separate channels? I don't really remember the terms from days long past, but I always thought that when you bridge an amplifier, you basically turn it into a mono amp.
I really don't want to do mods. I just want 2 boards, 4 channels, for a true 2-way active system.
If these are 2-channel boards, does 2 channels mean 2 completely separate channels? I don't really remember the terms from days long past, but I always thought that when you bridge an amplifier, you basically turn it into a mono amp.
I really don't want to do mods. I just want 2 boards, 4 channels, for a true 2-way active system.
The chip outputs 4x single ended channels. As set up, the boards are bridged, giving you 2 bridged outputs.
So each board is usable as a stereo. You'd want 2 boards for 4 channels at high power.
So each board is usable as a stereo. You'd want 2 boards for 4 channels at high power.
hkknudsen, look at documentation about TPA3255EVM. There is info how to connect 4 speakers on one board. In "TPA3255EVM Quick Start Guide" are pictures about speakers connection in different modes (SE mode for 4 speakers, BTL mode for 2 speakers and PBTL for one speaker). Switching between modes is made with jumpers, I think. Some info is in "TPA3255EVM User's Guide" in chapter "3.3 Single-Ended (SE) Output (4.0) Operation" on page 10. Maybe You will be limited with speakers impedance (2-4R).
Thanks, yes I am exactly looking at page 10 in the users guide. It seems you also believe jumpers is enough yourself. If there are some constraints with the speaker impedance we can still not conclude Solid7 needs to solder as he haven't told us the impedance. There is a significant difference between what TI calls 1N and 2N, but I am not sure what to conclude from that. I am maybe and maybe likely wrong, I would just like to learn and know how to conclude that soldering is required 😱
Look at the bottom board drawing on page 11. J22-J25 are soldered jumpers. When you have the board in your hands it becomes obvious.
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I'm looking at the manual right now, and there is no drawing, schematic, or graphic on page 11 - only tables.
Section 4.1, looking at the bottom right corner, page number 11 has the board layouts.
http://www.ti.com/lit/ug/slou441/slou441.pdf
The board images are on different pages depending on which EVM you're looking at. Apologies for lack of clarity: I'm speaking from the 3255EVM manual, although the layout is essentially identical for all the respective boards.
http://www.ti.com/lit/ug/slou441/slou441.pdf
The board images are on different pages depending on which EVM you're looking at. Apologies for lack of clarity: I'm speaking from the 3255EVM manual, although the layout is essentially identical for all the respective boards.
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I admit that I do not know how to read circuit schematics... but J22 and J25 are on opposite sides of the board. I don't see a trace path between them. What am I missing?
Can someone please explain this statement:
"Single-ended input settings on the TPA3255EVM should only be used for channels with
output configuration BTL or PBTL, not SE. For SE output configuration J4 and/or J19
jumpers for that channel must be set to the DIFF position, so the input signal INx is mapped directly to OUTx."
"Single-ended input settings on the TPA3255EVM should only be used for channels with
output configuration BTL or PBTL, not SE. For SE output configuration J4 and/or J19
jumpers for that channel must be set to the DIFF position, so the input signal INx is mapped directly to OUTx."
solid7, there's a thread on the 3255EVM specifically, where I, after a bit of unfortunate impatience, explain the input selection in terms of the schematic.