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Old 4th September 2011, 05:49 PM   #11
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On the same supply, the TA2024 will have 4x the power into the same load. The TPA3123 has single ended outputs and the TA2024 has bridged outputs.

I just noticed on the PartsExpress page for the TPA3123 it says "Fully-bridged stereo output", which is totally wrong.

I don't know, I think the TPA3122D2 boards I've built sound just as good as the Tripath stuff. The TPA3122D2 has bridged output's and I used better output filter values.

To get a better comparison between the two, you will need to power the TPA3123 with a >24V supply. Even then, the stock output filter values might kill the sparkle on the highs. Don't forget the outputs run through 470uF electrolytics as well. That can roll off the bass depending on the load and also "color" the sound.

All in all, I have to agree that there is no reason to pick the TPA board over the Tripath in this case. It's not that the TI stuff sounds bad IMO, it's just the TPA is poorly implemented here.

Last edited by theAnonymous1; 4th September 2011 at 05:58 PM.
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Old 24th February 2012, 12:19 AM   #12
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Though in theory this design should be inferior to a TA2024 design, in fact, despite its potential limitations, this Sure board is a very good performer. In terms of output, when driven with 24-30VDC it is somewhere in between a TK2050 board and a TA202X board, which is to say that if supplied with 30VDC at 2A it will provide about 25 good watts (1% THD) into 4 ohms. The board also has DIP switches for gain selection, and can be made pretty sensitive. Sound quality is very good, on a par with the TK2050 based products I have used, and just a tad less transparent than the lower powered Tripath based products. Plenty of bass and plenty of treble, into reasonable 4 and 8 ohm loads. I don't have a schematic for the Sure board but it appears that the output filter components are a reasonable compromise for these load impedances. Also, you can easily run headphones using this board, since the negative outputs are grounded. However, you need very good power supply regulation, to avoid 'pumping' at high output--a well known problem with single ended designs.

Given that the TPA3123D2 is a relatively low cost part, and can produce upwards of 50W of good power when bridged, I am surprised that nobody has put together a 2-chip bridged board.
According to the TI product sheet, the chip is relatively easy to configure in BTL mode. That would get rid of the coupling capacitors on output, the power supply pumping problem...and also the ability to drive 3 wire headphones directly. (BTW there us a headphone workaround for those designs where you can isolate each transducer (so that the negative leads are not connnected) but this is tricky work because of some of the strange wire used in headphone cords to increase their flexibility. Running a T-amp into isolated headphones is a real ear-opener, even if the phones were a bit mediocre driven by class AB amps. Better headphones thus adapted sound AMAZING. However, given that you can buy a gadget called a 'Boosteroo' for $25 at Radio Shack, and this works extraordinarily well, there are limits to how much futzing arouund with headphones is worthwhile.
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Old 24th February 2012, 12:51 AM   #13
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I've built my own bridged version using this IC. It's not as easy to bridge as the TPA3122D2 because you need to supply an inverted signal to one channel; you can't just ground the unused input like with the 3122D2.

I would say don't bother with bridging this IC unless you really need to work with the DIP package. Move up to one of the better suited chips.
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Old 19th December 2012, 08:47 AM   #14
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Default Bridging the amp

Hi, Can you please advise how to bridge this amp.

Cheers Derek
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Old 19th December 2012, 09:19 PM   #15
macky is offline macky  Philippines
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Quote:
Originally Posted by tabarddn View Post
Hi, Can you please advise how to bridge this amp.

Cheers Derek
look here:

My TPA3123 25+25W bridge proto-amp

my bridging adapter is taken from this site:
Bridging Adapter For Power Amps
Click the image to open in full size.
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Old 21st December 2012, 02:05 AM   #16
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Default Many Thanks

Many Thanks Macky
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Old 21st December 2012, 03:35 AM   #17
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Default Found this on EBay, is this what I need

Hi Guys I found this on EBay, is this what I need
BTL XRL Stereo to Balance Stereo to BTL Preamplifier Kit SC | eBay

By reversed-phase two-channel BTL buffer design bridge board. No signal distortion, no signal gain, no harm to the signal output. BTL two-channel pre-transfer balance sheet. Ordinary two-channel input signal RIN RGND LIN LGND. Output R + RGND R-L + LGND L-Ordinary two-channel amplifier can be set up with the balance (bridged) mono amplifier. Power increases four times (amplifier output current capability is sufficient in the case)

Connection: a channel (the same as another channel)XLR balanced pre-amp output + to + the left channel input and output two-channel amplifier to GND Input GND(Generally two-channel amplifier input to all linked together, and then a channel of GND on it)Preamp output - then the right channel amplifier input +And two-channel amplifier connected speakers, amplifier left channel output signal is +, then speaker + terminal. Right channel output amplifier - signal, then the speaker - side. (Amplifier previous connection of non-equilibrium, the left channel speaker + output + to the left channel speaker output to GND -, and balanced amplification, the amplifier output GND is empty do not accept.)
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File Type: jpg BTL bridge 2.jpg (131.4 KB, 415 views)
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Old 14th July 2014, 12:18 PM   #18
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From lossfound..

[The TPA3123 board is noticeably harsher and hashier in the treble on most speakers than the TA2024 board,]

As an adjunct to my previous post, I wonder if what "lossfound" is referring to is the sound I'm hearing, particularly the word "hashier" which sounds about right, like "fizzy"...

Disappointing if so because this TPA3123 performs so well in other areas.

Dunno then...

Cheers, Martin
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