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USB sound card for noise measurements
USB sound card for noise measurements
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Old 1st August 2020, 08:02 AM   #91
ginetto61 is offline ginetto61  Italy
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Hi ! i got the power injection cable. No differences at all with different +5VDC power supply solutions

Therefore is not the power supply responsible for the card noise floor ... it is something inside the card itself ... i see 4 screws
Attached Images
File Type: jpg IMG_20200801_095521.jpg (617.8 KB, 85 views)
File Type: jpg terratec _ powered by dc-dc converter.JPG (129.2 KB, 103 views)
File Type: jpg terratec_ teradak linear psu.JPG (124.3 KB, 99 views)
File Type: jpg terratec aureon usb noise _ avg linear.JPG (130.4 KB, 95 views)
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Last edited by ginetto61; 1st August 2020 at 08:12 AM.
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Old 1st August 2020, 01:48 PM   #92
Vovk Z is offline Vovk Z  Ukraine
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First two are really very similar, but the third one definitely looks much noisier.
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Old 1st August 2020, 02:54 PM   #93
bucks bunny is offline bucks bunny  Germany
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for me the last one looks less noisy
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Old 1st August 2020, 03:48 PM   #94
Vovk Z is offline Vovk Z  Ukraine
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Maybe something changed except powersupply?
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Old 1st August 2020, 04:20 PM   #95
ginetto61 is offline ginetto61  Italy
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Hi i checked better with the card powered via usb cable by the laptop
From the attached pic i see the same noise floor more or less. So to me the noise floor is very card dependent and not influenced by the power supply.
If i want the -140dB i have really to change card ... and it is perfectly fine because this is a very cheap sound card. No surprise.
In the other post the first two graph have been obtained
1) 12V linear power supply and a dc-dc converter to provide 5V
2) 5V linear power supply coming with the usb injection cable
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File Type: jpg terrates _usb power from laptop.JPG (127.8 KB, 72 views)
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Old 1st August 2020, 04:25 PM   #96
ginetto61 is offline ginetto61  Italy
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Quote:
Originally Posted by Vovk Z View Post
First two are really very similar, but the third one definitely looks much noisier.
Quote:
Originally Posted by bucks bunny View Post
for me the last one looks less noisy
Quote:
Originally Posted by Vovk Z View Post
Maybe something changed except powersupply?
Hi ! i notice now that i have not used the same dB range on the left ... so some graphs look noiser than the other ... but not enough for me to say that using an external power supply improves things significantly.
Maybe there is another dc-dc conversion inside the card ? and that sets the overall noise performance.
anyway there is a RMS value for noise on the graph (bottom left). Very similar in all cases.
The limits are clearly inside the card
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Last edited by ginetto61; 1st August 2020 at 04:40 PM.
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Old 1st August 2020, 05:52 PM   #97
Vovk Z is offline Vovk Z  Ukraine
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Quote:
Originally Posted by bucks bunny View Post
for me the last one looks less noisy
Maybe I was wrong, the last one actually less noisy but has to much "grass". It doesn't help for measurements. So easier to use first two. The last wants some clean.
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Old 1st August 2020, 11:55 PM   #98
trobbins is offline trobbins  Australia
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Are inputs shorted by the sockets (just in case there is a difference)?
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Old 2nd August 2020, 04:12 AM   #99
1audio is offline 1audio  United States
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USB sound card for noise measurements
The 1 KHz could be the USB communications getting back into the audio. Was the input shorted for these measurements?
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Old 2nd August 2020, 07:55 AM   #100
ginetto61 is offline ginetto61  Italy
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Hi no inputs open
I have a question off topic
Is noise above 20 kHz really a problem for an audio device? Because sometimes there is high frequency noise
I start loving dc-dc voltage converters a lot they are cute
As i need a dual supply +/-24V i have seen converters providing that with switching at 150 khz i wonder if they could be a valid option
I say this because smps are more and more common on pro audio equipment
Thanks a lot to All again
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