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Old 3rd November 2019, 10:12 PM   #1451
Hofmann is offline Hofmann  Netherlands
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Still very much a work in progress. 2x IRS2092s and a - /+ 65v power supply. There is also a speaker protection board. I've been thinking of changing all the wiring to a suitable gauge solid core wire. This way I can do the wiring much more tidy then what it is now.

The enclosure is laser cut aluminium and extruded profiles for the sides.

I've noticed that at the speaker protection module the negatives of the audio signal have continuity to ground. Is this common practice? Should I ground this module through the standoffs to the chassis, or should I keep it floating?
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Old 17th November 2019, 02:54 PM   #1452
Hofmann is offline Hofmann  Netherlands
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Here it is my amplifier with 2x IRS2092S and 500W +/- power supply. It has a speaker protection module that is powered by the 0 - 15v output of the power supply.

I took off the fans from the amp modules because they were noisy. I have noticed the heat sinks run pretty hot. I am looking for a bigger heat sink that connects both modules and is bolted into the chassis somehow. Either that or running heat pipes from the heat sinks to the chassis. Recommendations are welcome

The case is laser cut aluminium with extruded aluminium sides.
The front panel switch is not connected yet. I have my doubts using this switch for mains power is a good idea. It also features an illuminated ring that is powered by 12v, and the connections run very close together. I was hoping to use this switch to switch some kind of relay that turns on the power to the psu. But have not figured out the best way to do this.
I also plan to add a 12v trigger input system so the amp turns on when the preamp turns on(a preamp and DAC In one enclosure will be a future project.
I will also use the 12vdc output of the psu to make a 12v trigger output that can turn on the subwoofer amplifier
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Last edited by Hofmann; 17th November 2019 at 02:55 PM. Reason: Spelling
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Old 18th November 2019, 05:37 AM   #1453
Corrievr is offline Corrievr
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Hi Hofmann,

Those heatsinks on the amplifier modules are very small, even with these high efficiency amplifier modules, they are bound to get hot at sustained high output levels - this is why the fans were fitted in the first place. If I were you, I would re-arrange the chassis and mount the amplifier modules on either side of the chassis - remove the small amplifier heatsinks and use ~3mm or thicker aluminium Angle brackets to mount the amplifiers to the extruded side panels. Ensure that the bracket contacting area is flat (sanding with fine sandpaper) and also use some heat-conducting paste between the amp module and the bracket. The side panels should have sufficient area and not require fans for cooling.

This way you should have a quiet and cool running amplifier.
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Old 24th November 2019, 10:14 AM   #1454
Baldin is offline Baldin  Denmark
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Default My XcD ver 3.5 ca. 2 x 300W @ 8 ohm

Latest amp. Would say I'm horning in on this class-d thing.

LM4562, IRS2092S, ZXGD3003E6, IRFB5620, T106-2 @22uH, 1mm, 1uF, dual fb / pre + post-filter fb. F switch = 380 kHz.
+-70 Vdc (500W SMPS from eBay)
Running really cool. Coil less than 40deg C @ 20 deg C ambient temp. No heat from Fets. @ Idle of course

Used an old AMP as enclosure (got a few scraped ones from my previous workplace).
Ready for installment in my main system. And at some point I'll try to do some measurements.
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File Type: jpeg XcD3.5_Resize004.jpeg (17.4 KB, 132 views)
File Type: jpeg XcD3.5_Resize005.jpeg (18.3 KB, 116 views)
File Type: jpeg XcD3.5_Resize006.jpeg (20.4 KB, 135 views)
File Type: jpeg XcD3.5_Resize003.jpeg (18.0 KB, 128 views)
File Type: jpeg XcD3.5_Resize008.jpeg (12.7 KB, 96 views)

Last edited by Baldin; 24th November 2019 at 10:44 AM.
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Old 24th November 2019, 10:53 AM   #1455
Baldin is offline Baldin  Denmark
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Correction .... coil gets up to 50 deg C in idle
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Old 25th November 2019, 06:19 PM   #1456
luka is offline luka  Slovenia
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Excellent work Baldin!
As usual.. And you also have onboard peak detector? Awsome!
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Old 25th November 2019, 06:42 PM   #1457
Baldin is offline Baldin  Denmark
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Thanks Luka.
Well spottet Yes peak indicator, which detects how close the output is to the rail ... meaning that it is not bound to the input, and the peak value changes if you change to a different rail voltage. Here it is ca 4-5 volts from max rail.

A slightly modified circuit I found on the net, but quite useful

Baldin
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Old 26th November 2019, 05:27 AM   #1458
Reactance is offline Reactance  South Africa
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Quote:
Originally Posted by Baldin View Post
Latest amp. Would say I'm horning in on this class-d thing.

LM4562, IRS2092S, ZXGD3003E6, IRFB5620, T106-2 @22uH, 1mm, 1uF, dual fb / pre + post-filter fb. F switch = 380 kHz.
+-70 Vdc (500W SMPS from eBay)
Running really cool. Coil less than 40deg C @ 20 deg C ambient temp. No heat from Fets. @ Idle of course

Used an old AMP as enclosure (got a few scraped ones from my previous workplace).
Ready for installment in my main system. And at some point I'll try to do some measurements.
Nice work Baldin, hopefully you will sharing the design with us.
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