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Class D Switching Power Amplifiers and Power D/A conversion

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Old 6th September 2017, 07:11 PM   #1291
matt_garman is offline matt_garman  United States
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@den_hr - very cool, thanks for posting the extra pics!
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Old 17th September 2017, 10:00 PM   #1292
wdecho is offline wdecho  United States
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Default TPA3255EVM

I am using a 400VA 34V Antek toroid with 30,000uf of capacitance. I like it.
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Old 18th September 2017, 12:33 AM   #1293
zanlation is offline zanlation  Australia
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Five years ago I started a project to build a 3 channel power amplifier for my home theater and music setup. Yesterday, I finished it. Since starting the project I have blown 3 SMPS power supplies and four amp modules. I also retrieved the case and parts from the garbage bin twice. The most recent was a few weeks ago after blowing another SMPS and amp module. I learnt a lot from each experience and my pocket felt it too.

I decided to change the project to a 2 channel amp and build a mono for the centre channel later on. I ordered a CDA-250 kit from ClassDaudio.com and it arrived last week. When installing the kit I found that a couple of my speaker outputs were short circuiting. I wonder how much this played a role in my previous failed attempts! The CDA-250 is now up and running and sounds fantastic.

I designed my own case with a custom "zanlation audio" front and back panels. Its even got my own logo on the front and model number on the back. The bottom of the case is full of holes from previous modules and luckly, CDA-250 kit just fit. If anyone has a good method for working out how to mark the holes for drilling from the modules I would really welcome it. The worse part of the build was drilling the holes so I could screw the modules on.. exactly!

My next job is to install a power switch. I am using a remote control power board and logitech remote to turn it on/off. Next, I'll move onto a mono block.

Click the image to open in full size.

Click the image to open in full size.
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Old 1st October 2017, 12:06 PM   #1294
Baldin is offline Baldin  Denmark
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My small mixed pre- and post feedback self oscillating class-D ... called Green Nature

Based on OP275, LM5104 and IRFS5615.
Running +-28Vdc giving some 50W in 8 ohm.
Tried it on +-40Vdc, but it became too hot, so no go.
Built into an old DVD.
PCB is 50x50 mm
I'm using it for my PC. No noise, good bass and all together clear sound
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File Type: jpg GreenNature002.JPG (20.3 KB, 459 views)
File Type: jpg GreenNature003.JPG (22.8 KB, 249 views)
File Type: jpg GreenNature004.JPG (21.0 KB, 247 views)
File Type: jpg IMG_4612.jpg (1,003.0 KB, 285 views)
File Type: jpg IMG_4608.jpg (777.0 KB, 327 views)
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Last edited by Baldin; 1st October 2017 at 12:11 PM.
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Old 28th October 2017, 11:44 AM   #1295
yngvejos is online now yngvejos  Norway
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My first flirt with class D, a cheap TDA7498 from ebay.
I'm powering it with a 24v 2A psu and it sounds great on low levels. I'll be looking for a more powerfull psu to unleach it's full potential.
I liked it so much that I put it in a 0905 chassis even though I'm not planning to use it for anything.
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Old 30th October 2017, 06:44 AM   #1296
luka is offline luka  Slovenia
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Quote:
Originally Posted by Baldin View Post
My small mixed pre- and post feedback self oscillating class-D ... called Green Nature

Based on OP275, LM5104 and IRFS5615.
Running +-28Vdc giving some 50W in 8 ohm.
Tried it on +-40Vdc, but it became too hot, so no go.
Built into an old DVD.
PCB is 50x50 mm
I'm using it for my PC. No noise, good bass and all together clear sound
Nice, that is small, cheap PCBs. I like the style of inductors
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Old 5th November 2017, 10:22 PM   #1297
hugo stiglitz is offline hugo stiglitz  Germany
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first post here
dual-mono design, using two hypex ncore 500 modules with seperate power supplies and another supply for standby
Class D Amp Photo Gallery-img923-jpg
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Old 30th November 2017, 09:31 PM   #1298
Sous is offline Sous  Ukraine
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My new project of a superlinear amplifier of class D
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Old 1st December 2017, 05:24 AM   #1299
stewin is offline stewin  Kenya
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Quote:
Originally Posted by Sous View Post
My new project of a superlinear amplifier of class D
hi sir sous nice project,

where is the discussion forum ??

please post a link
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Old 1st December 2017, 07:35 PM   #1300
Baldin is offline Baldin  Denmark
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Quote:
Originally Posted by Sous View Post
My new project of a superlinear amplifier of class D
Good to see some are still developing something from scratch ... nice

Can you disclose just a little? Topology, components?

Looks super cool. Congrats
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