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Old 7th May 2012, 06:43 PM   #11
JohnD is offline JohnD  United Kingdom
diyAudio Member
Join Date: Oct 2006
Default USB noise

A USB isolator will certainly fix this but another solution is a small mains isolating transformer applied before and in series with the laptop's "brick" power supply.

Farnell sell a USB isolator that I know works well with the rDAC -see USB-ISO - OLIMEX - BOARD, USB 2.0 COMPLIANT PORT | Farnell United Kingdom


John Dawson (Arcam)
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Old 8th May 2012, 07:57 PM   #12
Telstar is offline Telstar  Italy
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Location: Italy
That will cap usb transmission to 24/96k at best.
"The total harmonic distortion is not a measure of the degree of distastefulness to the listener and it is recommended that its use should be discontinued." D. Masa, 1938
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Old 8th May 2012, 08:20 PM   #13
JohnD is offline JohnD  United Kingdom
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Join Date: Oct 2006
Originally Posted by Telstar View Post
That will cap usb transmission to 24/96k at best.
That's true but so what? There is almost no material you can find that's recorded at higher sample rates and it's hardly easy to tell the difference between the same material recorded at say 192ks/s and then downsampled to 96ks/s. So, on balance,I suggest it is probably better to get rid of the noise from the computer PSU if it's troublesome ...

IMHO of course.

John Dawson
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Old 15th May 2012, 06:15 PM   #14
orpheus is offline orpheus  United States
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Do you have a headphone amplifier and headphones? Try the output of the DAC into headphones to see if you still hear noise. Go from there to track the source of the problem. If you don't hear the problem through headphones, then it is a loop somewhere down the line between the DAC and the speakers. If you do hear the problem through headphones, then try another USB cable, port, computer, etc. If the problem is persistent, it is likely that your rDAC is faulty and you should return it for warranty repair.

It is a trap to assume that any given connection is the source of noise in your system without testing to verify. You can spend a lot of time and effort attempting to correct something that is not the problem.

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Old 11th June 2012, 12:26 AM   #15
nowhere is offline nowhere  Israel
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Join Date: Jun 2012
Another direction to explore is USB <-> Ethernet converter/adapter - Ethernet standard prescribes transformers, so there is galvanic isolation at both ends.

Signal travels through CAT5 cable in this case - most of the way.
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