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Old 19th May 2017, 03:09 PM   #11
astx is online now astx  Austria
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Join Date: Jan 2011
Location: Tyrol / Austria
Quote:
Originally Posted by AndrewT View Post
...
If only the front end had been on a Daughter board and the output board stretched a bit to make soldering and bolting a bit easier.
...
Different design wishes - different pcb layout
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Old 19th May 2017, 04:50 PM   #12
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looks good Thimios
__________________
Regards
Jan
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Old 20th May 2017, 12:09 PM   #13
thimios is offline thimios  Greece
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Join Date: Aug 2009
Location: Agrinion
1)Ready for test on a dirty workbench!
Offset=0mV
2)First time singing!!!
An old speaker just for test.
+/-25v using two Adjustable power supplies.
3)Idle current and temperature.
Attached Images
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File Type: jpg DSC09906.jpg (306.0 KB, 311 views)
File Type: jpg DSC09907.jpg (395.5 KB, 295 views)
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Old 21st May 2017, 10:02 AM   #14
thimios is offline thimios  Greece
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After successful first time singing, it's time for a complete test.
Power supply=+/-42v
Main transformer 2x30v a.c 2x3.75A
15.000uf/rail
Idle current=110mA
Excellent results to my point of view!
Attached Images
File Type: jpg DSC09915.jpg (240.6 KB, 266 views)
File Type: jpg DSC09927.jpg (233.7 KB, 247 views)
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File Type: jpg DSC09939.jpg (219.5 KB, 62 views)
File Type: jpg DSC09940.jpg (222.2 KB, 71 views)

Last edited by thimios; 21st May 2017 at 10:09 AM.
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Old 21st May 2017, 02:11 PM   #15
astx is online now astx  Austria
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Join Date: Jan 2011
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Quote:
Originally Posted by thimios View Post
...
Idle current=110mA
Very nice results! Idle current = bias current = current per MOSFET pair?
I have done most tests on SA2015 with about 110 - 140mA per MOSFET pair. A total of about 350 - 450mA per rail per amplifier.

BR, Toni

Last edited by astx; 21st May 2017 at 02:21 PM.
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Old 21st May 2017, 02:55 PM   #16
thimios is offline thimios  Greece
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Join Date: Aug 2009
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Quote:
Originally Posted by astx View Post
Very nice results! Idle current = bias current = current per MOSFET pair?
I have done most tests on SA2015 with about 110 - 140mA per MOSFET pair. A total of about 350 - 450mA per rail per amplifier.

BR, Toni
Yes Toni,this test was with about 110mA current per Mosfet pair,49,5mV/0.44R.
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Old 21st May 2017, 05:21 PM   #17
thimios is offline thimios  Greece
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Join Date: Aug 2009
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The FFT and Distortion Test confirms that SA2015 is a very good amplifier.
Testing using ARTA software.
1)1Khz/1W RMS
2)1Khz/72W RMS
3)10khz/40W RMS
4)20khz/40W RMS
5,6,7 Intermodulation distortion.
Sound card loop test.
last photo is a sound card loop test for reference.
Amplifier is even better(lower distortion) than my sound card can measure.
Attached Images
File Type: png 1k.PNG (103.3 KB, 77 views)
File Type: png 1K 72W.PNG (106.2 KB, 60 views)
File Type: png 10K 40W.PNG (108.3 KB, 50 views)
File Type: png 20K 40W.PNG (105.7 KB, 39 views)
File Type: png IMD.PNG (113.6 KB, 42 views)
File Type: png IMD3.PNG (106.5 KB, 38 views)
File Type: png IMD2.PNG (105.8 KB, 39 views)
File Type: png esi loop.PNG (106.4 KB, 46 views)

Last edited by thimios; 21st May 2017 at 05:40 PM.
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Old 22nd May 2017, 07:16 PM   #18
thimios is offline thimios  Greece
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Join Date: Aug 2009
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Now is time for housing!
A 3U chassis will be used.
Hand tapping.
Two options drilling and tapping 1&2.
Unfortunately, materials aren't perfectly flat.
There are gaps between the materials, Both in the first and the second option.
What is the best way filling the gaps between the materials, inserting thermal paste or thermal conductive silicone pad between heatsink and aluminium plate?
Attached Images
File Type: jpg taping sa2015.JPG (300.0 KB, 90 views)
File Type: jpg cooling sa2015.jpg (13.4 KB, 79 views)

Last edited by thimios; 22nd May 2017 at 07:31 PM.
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Old 22nd May 2017, 07:41 PM   #19
astx is online now astx  Austria
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Thermal grease along the middle axis of the heatsink would do it. Of course you could use the expensive thermal pad too but you don't need to isolate the heatspreader from big heatsinks...
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Old 22nd May 2017, 07:49 PM   #20
thimios is offline thimios  Greece
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Quote:
Originally Posted by astx View Post
Thermal grease along the middle axis of the heatsink would do it. Of course you could use the expensive thermal pad too but you don't need to isolate the heatspreader from big heatsinks...
The gaps are so thick that you can insert a corner of a sheet of paper between the heatsink and aluminium plate or you can even see between the two materials instead of a light source.

Last edited by thimios; 22nd May 2017 at 07:58 PM.
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