HiLetgo ADUM3160 B0505S 1500V USB to USB Voltage Isolator Module Support 12Mbps 1.5Mbps

This device works exactly as it should: it isolates USB from ground loops, curing a common cause of hum or buzz in audio connections. In my case I have a digital piano connected by USB MIDI and an audio interface also connected to the piano (to record the piano.) I got nasty buzz from the audio interface. Unplug the USB MIDI and the problem goes away, but I need the MIDI connected. This device does the trick.I wouldn't use this on any device that needs the full speed of a USB 2.0 connection, like an audio interface with lots of channels, or running stereo at 192kHz sample rate. My Focusrite audio interface doesn't work at all when connected via this device, it doesn't completely power up. Some LEDs are lit but the power LED is not, and it does not respond to audio input.But it solves the problem for my MIDI->USB cable.

My Windows 10 PC sees something there, but unfortunately it's "Unknown USB Device (Device Descriptor Request Failed)". Without the Isolator I get the correct "Digital Audio Interface (Line 6 HX Stomp)" (and also a lot of hum over the audio, which is why I bought this one.I also bought a similar one from another vendor - same results. Not sure what these are actually doing (some LED's light up), but if they can't respond to a Device Descriptor Request, they are pretty useless. Actually they might work OK if all you need from the USB is power and not data. They could be good for that. They need to stop calling these "Compatible with USB2.0", because they're not. Might work with USB1; I don't know.

Worked perfectly to remove a super high pitched whine from my PC's dirty USB ports. The horrible noise was louder than the music before.Not sure if it was EMI or a ground loop, but it's all gone now! I'm impressed and surprised, as this computer/room has proven to be a very dirty RF/EMI environment! Just tested a bunch of the noisiest USB ports and so far they've all come clean with this little guy. Even the noisy LED-backlit gaming keyboard output comes clean, as does a USB3 hub with a bunch of devices on it.My setup is Desktop PC to monitor to an Audioengine D3 to a DarkVoice 336SE tube amp. The music comes through clean and silent now.Also works fine with my XDuoo XD-05 DAC/Amp, but that wasn't noisy to begin with as it's battery powered and doesn't drink the dirty USB juice or connect to ground power-wise (it uses a cell phone style wall wart to charge the battery on a separate circuit).The little black box labeled 'mornsun' does appear to get a little warm, and yeah that blue LED is way too bright, but otherwise this thing is great. I can always apply some black electrical tape if I need to block the light.

I purchased an XLR to USB cable to connect a mixer directly into a laptop to broadcast with OBS. When I connected the mixer output to the USB port, I was getting a rumble with fax-like noise on top. I'm using an older Dell laptop with USB 2.0 only. When the laptop was on battery power, the signal was clean. When I used my power adapter on the laptop, the noise could be heard. While the laptop was using the power adapter, I plugged in the group loop device between the XLR cable and the laptop USB port. To my delight, the noise disappeared.The device is wider than flash drive and in my case, partially covered the USB port next to it. My workaround was to use a USB port bank. Some models I've seen sold on Amazon also ship with a short cable to eliminate this issue.I cannot say if the device works on USB 3.0 ports or not. In my case, the device worked fine with the DIP setting on "1" and with a blue light on USB 2.0. Setting the DIP switch to ON apparently is for high speed mode (12Mbps, red light) and "1" is for low speed (1.5Mbps, blue light). My device was shipped with a red DIP switch, not blue as in the picture. However, the function appears to be the same.The device has exposed components on the board. The sip/dip module (the large, tall, black component) seems particularly vulnerable. When I opened the package, it was bent about 15 degrees to the side. I pushed it back in place and it still works but it's not an ideal situation. I plan on printing a case for it as soon as I can.With all that said, it accomplishes the same task as more expensive devices and is economical enough purchase multiple units if necessary.

Exactly what I needed, exactly as described. Thank you

Used to eliminate noise from a usb powered bt receiver in the car. Got rid of the noise, but made a repeating click/pop. Will try it for something else later.

Worked specifically to fix ground loop noise when connecting a laptop and an electric piano to the same mixer, and also to the same audio interface and MIDI through USB. Two big long ground paths if you do that—you have to break one or you’re in noise city.Since the MIDI is low bandwidth and an easy signal, this works great on that USB connection. The MIDI continues to work great, and the audio interface can be the master ground for the audio itself. This way I can record/listen to both the digital piano audio and the computer interface audio out mixed into my monitors with no noise, and even overlap and overdub during recording.Works great for that use case. Not sure about others, but not sure I’d want this for a higher bandwidth use. YMMV.

This devise does a great job attenuating noise but also diminishes signal from the Focusrite which can be amplified to record the signal. Ultimately, the noise reduction effect of the recording program does the job as well. Not worth it for my application.