A dedicated 19V hefty (4.5A) linear stabilized PSU (LM350K) ![]() Two 19V SMPS bricks (one the original (3.4A), the other a generic (4.7A) No external PSU, only the internal battery. The laptop had fully charged batteries, one month old, properly seasoned (Li-ion, 11.1V/4.4Ah) I was sitting close to the loudspeakers of my system so I could listen to the difference in electric noise from the Laptop PSUs (that was the intent). I was testing different PSUs for my laptop which I use as digital source (Laptop USB out to a CM6631A USB to I2S board). Maybe that would have avoided the HS01 problems, but Topping claims the device works with USB powered dacs if auxiliary 5v power is fed in through a USB-C power connector on the side of HS01.Ĭlick to expand.The hole in the ground is too deep Its also possible to operate the dirty (or USB interface side) from a separate clean +5v supply. The clean side uses a dedicated clean +5v supply from inside the dac. ![]() Its dirty side is by default powered by USB. It was just a random experiment to see if it had any effect at all, which as it turned out it did.īTW, this happened using I2SoverUSB. DAC always sounded good without such a device. Removing HS01 fixed all the above symptoms at once. It also sometimes caused the USB board to drop out and start generating noise at the dac output. Putting a metal shield between the USB board and the rest of the dac helped some. Also, every different +5v power supply I tried with HS01 made the dac sound different. For one thing it seems to generate a lot of EMI/RFI that can radiate across galvanic isolation barriers with ease. Found if anything it created new problems. If anyone has some similar or different experience with these units, I would like to know.Ĭlick to expand.Recently got an HS01 just to check out. I can take the chance for buying a-non functional unit from ebay from time to time, but the really bad news here is that, what happened with this 15.754Euro useless USB isolator, took with it the downstream USB to I2S device (Amanero clone) costing 29.51Euro. Post-mortem inspection revealed two ‘V05’ ICs (ED3, ED5 on the PCB, which are protection diode arrays) as well as the ADUM3160 IC having visible damage (surface bulging). Well, immediately, light, smoke and smell came out from behind the USB-out area of the isolator PCB. Therefore I connected an external 5Vdc source to the isolator (voltage and polarity tested) to see if the unit will function properly. With no external power connected to it, the host PC did not see the USB to I2S device connected downstream of the USB isolator hub (which it was detected and functional when the isolator was not in between). Since the Steinberg UR22C can take an external power via the micro USB port on the back, plug that in to a USB phone charger and then plug the phone charger into the same powerboard as your computer and speakers.I purchased from ebay a USB isolator hub naked unit The USB isolator can't pass on enough power for your audio interface to work properly. I suspect that the issues you're having with the Steinberg UR22C being recognised by your computer are due power issues. If running the speakers off of an unplugged laptop stops the noise, then a USB isolator is potentially the solution to the noise (as you have already found). Whether or not the noise still comes through the speakers should let you know if there was a ground loop running through your desktop (since it was plugged in to mains). I haven't got an external power supply for my audio interface but this did not solve the issue with a previous interface so I'm not confident it would work here.ĭo you have a laptop? Try using a laptop running on it's battery (unplugged from the wall) with the audio interface (without the USB isolator) and speakers. Waiting 10-30 seconds between unplugging and plugging back in.Using different USB ports (both on front and back of PC).Without the isolator, no problems being recognized, but I get the horrible screeching from the graphics card.Īs the isolator was quite expensive and there's no guarantee that a different isolator wouldn't have the same problem, I first wanted to check if anyone here had any idea why there's this difficulty communicating through the isolator, and if there's any way to reliably make the connection? Unplugging and plugging it back in eventually works, but there's no consistency - sometimes it takes 1 try, sometimes 20. However, on start up, my PC has trouble recognizing my audio interface (Steinberg UR22C) through the isolator. ![]() I solved this issue by using a USB isolator ( this one which is no longer available), which does work. I have a problem with graphics card/CPU noise being transmitted through USB to my audio interface, similar to this post here.
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