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Class D Switching Power Amplifiers and Power D/A conversion

TDA8954TH - XH-M252 board - anyone?
TDA8954TH - XH-M252 board - anyone?
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Old 17th December 2018, 12:09 PM   #21
dzwer is offline dzwer  Bulgaria
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This board is with 2 ICs TDA8954, which are already bridged...
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Old 17th December 2018, 03:22 PM   #22
tacoman5000 is offline tacoman5000
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Quote:
Originally Posted by dzwer View Post
This board is with 2 ICs TDA8954, which are already bridged...
Thanks, that's what I read too but I was still hoping there's a way. Would it be possible to just use a dummy load on the other channel? I have no idea what value and kind of resistor I'd need though.
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Old 17th December 2018, 03:47 PM   #23
dzwer is offline dzwer  Bulgaria
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Just short the unput to GND for that channel. At the otput you may put 100ohm/0.5W resistor, to keep the output with low potential.
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Old 17th December 2018, 05:29 PM   #24
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Quote:
Originally Posted by dzwer View Post
Just short the unput to GND for that channel. At the otput you may put 100ohm/0.5W resistor, to keep the output with low potential.
Awesome, thanks. I'll finally be able to post listening impressions for this amp once I get the right transformer for it.
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Old 17th January 2019, 07:15 AM   #25
tacoman5000 is offline tacoman5000
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I need help wiring this board.

The power and audio input terminals have a ground with which I don't know what to do. I got a toroidal transformer with dual 24V ac outs while this board requires 24V as well. I've read about how the dual outs can be wired in series and connecting one end of the connections to the ground but this would add the voltage to 48V. Should I get a 12V dual out transformer and wire it in series instead?

Also, what do I do with the ground terminal on the audio input if I want to connect L and R rca connectors?
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Old 17th January 2019, 01:54 PM   #26
dzwer is offline dzwer  Bulgaria
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All is described in this picture: https://luckyretail.com/Uploadfile/2...0/159570-7.jpg
If your transformer has separate secondaries, then see this picture: http://sound.whsites.net/xfmr8-1.gif
You need the right part - 0V connect to the GND.
The inputs connect to the signal source, preferably with 10k A-type logarithmic potentiometer.
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Old 17th January 2019, 10:28 PM   #27
tacoman5000 is offline tacoman5000
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Quote:
Originally Posted by dzwer View Post
All is described in this picture: https://luckyretail.com/Uploadfile/2...0/159570-7.jpg
If your transformer has separate secondaries, then see this picture: http://sound.whsites.net/xfmr8-1.gif
You need the right part - 0V connect to the GND.
The inputs connect to the signal source, preferably with 10k A-type logarithmic potentiometer.
Thanks for the reply. The 2nd picture is exactly what I was describing but I would need dual 12V outs in series to not go over the max voltage of this board. I don't know why the first picture recommends dual 24V outs when you have to wire in series to connect to the ground which would add the voltage to 48V

I purchased the wrong transformer for it but I guess I can use this on an IRS2092S with rectifier board for a subwoofer project.

Last edited by tacoman5000; 17th January 2019 at 10:42 PM.
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Old 18th January 2019, 08:52 AM   #28
dzwer is offline dzwer  Bulgaria
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If your transformer is 2x24V - it is suitable!
Attached Images
File Type: png Two_secondaries.png (19.2 KB, 87 views)
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Old 19th January 2019, 12:17 AM   #29
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Ah, I see now thanks. No more problem with the power supply but I still can't make the audio input work. How do I wire it to a pair of rca connectors without a potentiometer? How do I deal with the ground pin? I already have a passive preamplifier that I will use so I don't need a potentiometer.
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Old 20th January 2019, 09:55 AM   #30
dzwer is offline dzwer  Bulgaria
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Just connect it to the passive amplifier...
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