![]() After reconfiguring the whole cabling of the system the spectrum is much cleaner. Had a ton of noise above 1 kHz and some spikes at 50 Hz and 150 Hz before. Maybe I have to go fully battery powered to solve that issue as wellĭid a few measurements today and noticed that the distortions have gone completely: The ALLDAQ is fed by a cheap PSU too because I do not want to spend the extra 50 Euros just for the official accessory. Recording an unbalanced loop with Rightmark's Audio Analyzer I can still see those 50 Hz and 150 Hz spikes in the noise spectrum. ![]() I do ask because I had some noise issues with a pair of very sensitive in ear microphones in the past which picked up hum at 50 Hz and 150 Hz. Looking at the noise isolation properties, I wonder whether there will be any significant difference between a cheapish off-the-shelf supply and a higher quality supply approved for medical and engineering purposes. So my expectations are quite high for an USB isolator of that price.Īs to the power supply, is there anything special to consider when selecting a 12V PSU for the BFP? I just tried an old Telekom Speedport 12V / 2.5A adapter and it appears to work fine. That is already the price range of a decent balanced DAC which I could feed with an optical signal and thus evade alle the noise introduced by the computer. Spending 200 - 300 Euros for an USB isolator is still questionable imo. Maybe I can achieve the same effect for cheaper. I will switch to the 2.0 port once the error reappears.īefore making a final decision I want to test all possible setups, switching between the ALLDAQ, the Intona and an external USB hub I ordered. Using the 3.0 port with its limited endpoints may have been the cause. ![]() I see, thanks for the hint! I actually encountered that issue yesterday one or two times when hooking up the adapter. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |