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Class D Switching Power Amplifiers and Power D/A conversion

Some Class-D questions!
Some Class-D questions!
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Old 25th August 2016, 12:42 AM   #1
themrcul is offline themrcul  Australia
diyAudio Member
Join Date: Feb 2014
Default Some Class-D questions!

Hi all,
I'm hoping to take advantage of the excellent know-how in the forums here for some advice - as I am *very* new to combining these boards to make working amplifiers.

The speakers I am hoping to drive are 2x dipole (sub)woofers, which I plan to build to handle 40-300Hz region. (KaZba dipoles to be exact).

I think I will want at least 100watts into 4 ohms. The speakers RMS power handling is 160Watts.

Looking at specs alone, this ebay board looks good:
TAS5630 300W 300W Class D Digital Audio Amplifier Board Hifi With AD827 Preamp | eBay

I just have a few questions:
I can easily source a 48V supply, in either 7.5A (360W) or 10A (480W).
1) I am confident I won't need more than 150W, and the RMS rating of the speaker drivers is 160W anyway, so would I get away with the 360W supply? (The exact power supply in question is here: http://www.ebay.com.au/itm/AC-220V-T...NqNx2ryBtUYWxg)

2) These LED power supplies have 3 lines for both +ve and -ve DC output - do I wire all 3 +ves to the +ve input of the amp board and all 3 -ve to the -ve? Or only one of each? Do I also then ground the ground output of the power supply to the chassis of the enclosure? If so does this preclude me from having a plastic case?

3) There appears to be no volume control on this and many other class-d amp boards - are people changing volume via the output of their sound source to change volume? Would there be dip switches or resistors I would change to cap the max volume?

4) If any of this is a terrible idea and you have other suggestions in the similarish price point would anyone be able to advise?

Thanks all!

Last edited by themrcul; 25th August 2016 at 02:15 AM. Reason: Fixed broken link to power supply
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Old 25th August 2016, 02:19 AM   #2
DUG is offline DUG  Canada
diyAudio Member
Join Date: Jan 2003
Location: mississauga ontario canada
1. If you want to limit the TAS5630 in BTL with 4R load to about 100W, you only need a 31V supply. Review data sheet here: http://www.ti.com/lit/ds/symlink/tas5630.pdf page 12

2. More detail of the PS you are referring to is required for an answer.

3. See #2.

Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
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Old 25th August 2016, 02:22 AM   #3
themrcul is offline themrcul  Australia
diyAudio Member
Join Date: Feb 2014
Hi Dug,
Thanks for the reply, I edited my first post to fix the link to the power supply in question. (AC 220V TO DC 5V 12V 24V 48V Switch Power Supply Driver Adapter FOR LED Strip | eBay)
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