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Class D Switching Power Amplifiers and Power D/A conversion

Noob wants to build something for DQ-10's
Noob wants to build something for DQ-10's
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Old 11th January 2019, 07:21 PM   #1
TJude is offline TJude
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Default Noob wants to build something for DQ-10's

I'm looking to build a class D PA for my Dahlquist DQ-10s. I've been using a Class A DH-500 for years, but with the new digital inputs (Sonos), I want the flexibility of a class D so I can leave it on all the time. Problem is, I need 250W a side, and it doesn't appear that there's lots of that.

I'd like to build two monoblocks and use my Hafler chassis to house it all. Problem is, I only really just learned what Class D amps were, and don't know where to start. I do have some experience - built the DH-500 and have modded the crossovers in the DQ-10s, but I'm really a noob.

Any ideas?
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Old 11th January 2019, 07:35 PM   #2
chermann is offline chermann  Austria
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if you really need about 250W power..TPA3255EVM board directly from TI shop.
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Old 11th January 2019, 08:30 PM   #3
TJude is offline TJude
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if you really need about 250W power..TPA3255EVM board directly from TI shop.
Yeah - I saw that. Nobsound has a build on Amazon. Do you know this chip/board? Is it easy to design?
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Old 11th January 2019, 09:10 PM   #4
FauxFrench is offline FauxFrench  France
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Originally Posted by TJude View Post
Yeah - I saw that. Nobsound has a build on Amazon. Do you know this chip/board? Is it easy to design?

TPA3255 is very good sound-wise. Chris is very experienced with TPA3255. An alternative with more than 250W power is a IRS2092 based amplifier. Nigel is very proficient with IRS2092.
I have nothing that powerful.

Last edited by FauxFrench; 11th January 2019 at 09:36 PM.
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Old 11th January 2019, 10:10 PM   #5
voltwide is offline voltwide  Ireland
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Originally Posted by TJude View Post
Yeah - I saw that. Nobsound has a build on Amazon. Do you know this chip/board? Is it easy to design?
If you were experienced in desingning conventional class a/b amps - designing the class d-amp will be a challenge. And if you are a noob, this might be a long and frustrating road to nowhere. So I would recommend some readyly build modules. Some years ago I bought a couple of 250W Modules from SEEEDStudio - these work still flawlessly in the pub where I installed them.
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Old 11th January 2019, 11:25 PM   #6
eddperks is offline eddperks  United Kingdom
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I can say from experience that attempts in designing discrete class-D amps has resulted in a lot of magic smoke being released. Designing IC based solutions (and you can find ICs that can handle around the power levels you are after) is a lot easier!

Failing that I have had great experience with the Sure amps (but not their integrated bluetooth and DSP amps):

Sure Electronics' webstore Mid Power Audio Amplifier (30-300W per channel)
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Old 11th January 2019, 11:33 PM   #7
bwaslo is offline bwaslo  United States
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Noob wants to build something for DQ-10's
Not that it matters since you're changing away from it, but DH-500 is class AB, not class A. Unless you modified it (and heatsinked the hell out of it!)
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Old 11th January 2019, 11:41 PM   #8
voltwide is offline voltwide  Ireland
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Originally Posted by eddperks View Post
I can say from experience that attempts in designing discrete class-D amps has resulted in a lot of magic smoke being released. Designing IC based solutions (and you can find ICs that can handle around the power levels you are after) is a lot easier!

Failing that I have had great experience with the Sure amps (but not their integrated bluetooth and DSP amps):

Sure Electronics' webstore Mid Power Audio Amplifier (30-300W per channel)
My fault: I was talking about SureElectronics, not SEEEDStudio.
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Old 12th January 2019, 10:36 AM   #9
chermann is offline chermann  Austria
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Originally Posted by FauxFrench View Post
TPA3255 is very good sound-wise. Chris is very experienced with TPA3255. An alternative with more than 250W power is a IRS2092 based amplifier. Nigel is very proficient with IRS2092.
I have nothing that powerful.

Thanks for the roses FF


but seriously i am not an developer an expert....i trying around with nooby things at this board...What is wrong with TPA3255?


i just try and learn with these chinese TPA3255 board. if you read in this threat

you will realize that this implementation is not build for 300W as the chip can do.
This is the reason way its better to buy a TI or 3E board TPA3255.
the irs2092 i do not know.




once again....are you really sure that you need 250W and more.....before i start with diy (still nooby)...i bought and rent a lot of amplifier and i swore that bigger is better ......now i know it a little better.....
power is nothing with control = >...less thd and noise etc...


chris
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Old 14th January 2019, 04:44 PM   #10
Guerilla is offline Guerilla  Denmark
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If you are lucky, maybe you can find boards that can use the powersupply from your hafler?
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