VSSA PMI version vs Peeceebee Shaan version - diyAudio
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Old 26th February 2015, 11:47 AM   #1
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Default VSSA PMI version vs Peeceebee Shaan version

It is usefull if we have opinions about those measurements.
Keep in mind that two amplifiers have the same Power Supply ,linear +/-32v ,36000uf/rail when inputs is in parallel.Outputs are under scope control at 6,9v RMS on a dummy load=6R
Each unit tested alone.
These measurements was repeated 4 times for each module
Attached Images
File Type: jpg DSC08697.JPG (530.7 KB, 526 views)
File Type: jpg DSC08698.JPG (568.7 KB, 492 views)
File Type: jpg VSSA NO CCS.JPG (110.2 KB, 480 views)
File Type: jpg VSSA NO CCS 5K.JPG (88.5 KB, 463 views)
File Type: jpg VSSA CCS PMI.JPG (91.0 KB, 451 views)
File Type: jpg VSSA PMI 5K.JPG (113.3 KB, 152 views)

Last edited by thimios; 26th February 2015 at 12:05 PM.
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Old 26th February 2015, 11:59 AM   #2
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Interesting results thimios. Looks like the peak levels of the harmonics are similar, but the 'grass' is taller with the CCS. Looks like empirical evidence that the simple version might be the better way to go if you are willing to accept its limitations.
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Old 26th February 2015, 12:10 PM   #3
bimo is offline bimo  Indonesia
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Quote:
Originally Posted by thimios View Post
It is usefull if we have opinions about those measurements.
Keep in mind that two amplifiers have the same Power Supply ,linear +/-32v ,36000uf/rail when inputs is in parallel.Outputs are under scope control at 6,9v RMS on a dummy load=6R
Each unit tested alone.
Hi thimios, I made VSSA with CCS too. CSS will make the PSRR higher.
I see PMI version have higher noise. THD should be same. I think Shaan version have better PCB layout.
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Old 26th February 2015, 12:11 PM   #4
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Quote:
Originally Posted by jkuetemann View Post
Interesting results thimios. Looks like the peak levels of the harmonics are similar, but the 'grass' is taller with the CCS. Looks like empirical evidence that the simple version might be the better way to go if you are willing to accept its limitations.
Thanks jkuetemann for reply.
Looking at these results this is my opinion also.
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Old 26th February 2015, 12:15 PM   #5
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Quote:
Originally Posted by bimo View Post
Hi thimios, I made VSSA with CCS too. CSS will make the PSRR higher.
I see PMI version have higher noise. THD should be same. I think Shaan version have better PCB layout.
Hi bimo.
Hearing the PMI version with headphones you can hear higher noise than Shaans version.
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Old 26th February 2015, 12:20 PM   #6
bimo is offline bimo  Indonesia
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Quote:
Originally Posted by thimios View Post
Hi bimo.
Hearing the PMI version with headphones you can hear higher noise than Shaans version.
I made 2 prototype PCB, before I can not hear anything if my ear 1 cm away from speaker with opened input. PCB layout for CFA is difficult.
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Old 26th February 2015, 05:28 PM   #7
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Another Shaan peeceebee using ksa1381,ksc3503E
Attached Images
File Type: jpg VSSA SHAAN 3503.JPG (279.2 KB, 146 views)
File Type: jpg VSSA SHAAN 3503 5K.JPG (111.4 KB, 117 views)

Last edited by thimios; 26th February 2015 at 05:31 PM.
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Old 26th February 2015, 05:39 PM   #8
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ATTENTION all these measurements must be read as WITHOUT any load.
Dummy Load was disconnected unexpectedly.
Now i must repeat all these.
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Old 4th March 2015, 02:46 AM   #9
abetir is offline abetir  Philippines
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Hi thimios, the thread title is interesting, I have attached my pcb lay-out of Shaans PeeCeeBee but employing PMIs component. If you wish to go deeper into the comparison test I guess the PCB might unlock some mystery

..just a thought though..

Regards!

BTW The assigned component on the PCB was my own mod, provided also was PMIs original schematic and can also be followed "as is" using my PCB lay-out. The PCB lay-out is tested and is fully functional, this is my VSSA unit at home.
Attached Files
File Type: pdf VSSA_ccs_10uf_bypass_all.pdf (228.5 KB, 142 views)
File Type: pdf VSSA_ccs_10uf_bypass_bottom_copper.pdf (150.1 KB, 103 views)
File Type: pdf VSSA_PMI_Schematic.pdf (43.4 KB, 163 views)
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Old 4th March 2015, 04:41 AM   #10
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Very interesting thank you for making and posting the measurements
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