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Old 26th March 2014, 04:09 PM   #1
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Default TPA3123D2 class d amp bridging

i have a single 8ohm, 40watt high sensitivity fullrange speaker in a br-box, that is used for outdoor / boombox purposes.
i already own tpa3116 boards which im very happy with for other applications.
...but since i do not need excellent sound quality, but perfect matching supply for the single speaker, i came across the 3123.
without hesitation i ordered this board yesterday:
Click the image to open in full size.
MINI 2channels TPA3123 Class D Digital AMPLIFIER BOARD ASSEMBLED 20W+20W | eBay
(ebay-links from foreign countries usually do not work for me, but here you go.)

today i came across this board on aliexpress and im almost ready to order this one, too.
Click the image to open in full size.
Free Shipping! 1pc TPA3123 Class D digital amplifier board 25W +25 W with Mute Sleep-in Other Electronic Components from Electronic Components & Supplies on Aliexpress.com

$9.77 with free shipping to germany is such a great offer.

well now,....
i want to bridge that little monkey.
as far as i understand the ti-datasheet it should be quite easy and fit my speaker quite well.
Click the image to open in full size.

is it really as simple as desoldering and bridging the big caps at the outputs and chose the left positive output as negative output?
do i overlook something?
any thoughts on that venture?
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Old 26th March 2014, 04:25 PM   #2
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You need a differential input.
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Old 26th March 2014, 04:48 PM   #3
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holy crap!
the datasheet says so, too.
i had to google what that means.

i will run the setup with a small preamp with buffers, mono-summer, 18db-hpf and volume control.
i guess there will be the need of an additional section like this...
Click the image to open in full size.
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Old 26th March 2014, 05:36 PM   #4
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as creating a diferential signal seems to be the key to bridge the 3123 successfully, i leave all that in this thread...
the outputs must have a 180 deg phase delay.
this is what the above does.
i found another solution on the same site (fig 4).
Balanced Transmitter and Receiver II
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this seems more simple.
is it achievable in practice?
how can volume control be added to this?
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Old 26th March 2014, 10:44 PM   #5
Khron is offline Khron  Romania
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This last schematic is for (impedance) balanced line inputs only, like you'd find on an audio mixer. For your amplifier you'll need a "real" differential input.

The schematic in figure 4 "only" presents the same impedance on pins 2 and 3 of the XLR.

What you need is in figure 3A.
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Old 27th March 2014, 12:28 AM   #6
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It will be on the breadboard within the day the amp arrives.
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Old 27th March 2014, 01:48 AM   #7
kp93300 is offline kp93300  Malaysia
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This board is BTL into 50 W and may be what you want

2X50W Stereo Class D Audio Power Amplifier Circuit Board TI TPA3123 | eBay
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Old 27th March 2014, 08:45 AM   #8
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i cannot open that link.
can you please post an ebay-number and/or pic?
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Old 27th March 2014, 09:29 AM   #9
kp93300 is offline kp93300  Malaysia
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The ebay no
291067921693
store name ELECKIT
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Old 27th March 2014, 06:34 PM   #10
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Thank you very much!
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