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Old 28th March 2014, 08:05 AM   #11
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Bridging Adapter For Power Amps
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Old 28th March 2014, 12:30 PM   #12
xrk971 is offline xrk971  United States
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Anonymous,
Thanks for the link - good stuff in there. Why is it that the tpa3116 doesn't require such a balanced input driver when running in mono PBTL mode? Or maybe it does and the op amp is indeed there on the few boards sold as this. I just recall one of the Audiobah boards only required bridging a couple of solder points to achieve a parallel bridged mode.
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Old 28th March 2014, 12:48 PM   #13
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the block-diagram in the tpa3116-datasheet looks like the chip is doing that internally.
3116 is btl in stereo mode, pbtl in mono.
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Old 30th March 2014, 02:23 AM   #14
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Quote:
Originally Posted by xrk971 View Post
Anonymous,
Thanks for the link - good stuff in there. Why is it that the tpa3116 doesn't require such a balanced input driver when running in mono PBTL mode? Or maybe it does and the op amp is indeed there on the few boards sold as this. I just recall one of the Audiobah boards only required bridging a couple of solder points to achieve a parallel bridged mode.
The 3116 has full-bridge outputs, the 3123 has single ended outputs.

Like mentioned above, the 3116 is taking care of that internally.
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Old 30th March 2014, 03:00 AM   #15
Lo_Tse is offline Lo_Tse  Canada
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Quote:
Originally Posted by theAnonymous1 View Post
Or one can use a balun - all you need is a small transformer. However, opamp and resistors are cheaper, but you do need a power supply to run the opamp. Some "audiophiles" that I known of really like to the idea of "transformer coupling" .

Regards,
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Old 27th May 2014, 06:05 PM   #16
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i recieved both boards in the meantime.

the red board sounds quite ok.
i didnīt listen too much with it, because i lend it to a friend.

i didnīt listen to green one.
it came without the plug-in-part of the connectors.
i consider to change those plug-connectors for screw-terminals.
overall it looks not so good manufactured.
also the seller from aliexpress declared the package as a gift.
that was a big mistake.
german customs donīt like to get fooled.
i had to pay 6€ extra.
for the money it did cost me in total i could have purchased a blue yj tpa3116 board.
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Old 8th June 2014, 01:26 PM   #17
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i have added 'differential' outputs to a preamp made on a perf board.
today my friend will back the red tpa3123 board.
can i simply connect the preamp to L and R and leave GND free?
Does it work with the volume control?
can i leave the output capacitors?
what will the effect of not removing them be?
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Old 28th June 2014, 12:49 PM   #18
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damn!
i'm such an idi*t.
i prepared everything for a test with green board.
then i accidentally switch + for - at the dc input.
the chip popped.

now i'm at my next victim the red board.
first time i compare the components to those from the datasheet...
looks like yuan-jing has changed a few component values.
they even didn't use what they printed onto the pcb.
maybe those smd capacitors are not what the printing says.
the inductors they use have no printing on it.
does anyone have an idea, what value this might be?
10uH maybe?
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Old 30th June 2014, 09:25 AM   #19
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it works!

i used that circuit wit a little different values.
Click the image to open in full size.
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Old 30th June 2014, 06:50 PM   #20
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I can understand U6 being an input buffer, and U5 providing a low impedance virtual ground. Then there is U11 providing the non-inverted signal and U1 providing the inverted signal. But I'm wondering what U2 and the associated resistors and capacitors are there for. Are they filtering out some frequency components? Do they allow for tone adjustments?
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