![]() Some systems must comply with the IEC60601 standard: isolation at all interfaces and peripherals at patient points of contact. At least two independent isolation systems are normally required. I have the DAC’s recommended power supply, it would just be less convenient and I don’t actually know if any of this will works.Medical system designers who want to take advantage of USB’s plug-n-play, hot swappability, and robust peripheral support must factor in isolation for safety concerns. It seems that yours conditions (?) the power feed, so I wouldn’t have to use an external power supply. If I use any galvanic isolator I’ve run across I will also have to use an external power supply as an isolator will sever the power stream. I’ve been told that a USB galvanic isolator will ‘probably’ fix it. I’ve finally traced the 50 cycle hum fault to something between my RME Babyface and the computer. The isolation voltage (1kV, 5kV etc) is normally not important or of any concern regarding USB audio ground loops. It’s also ideal when using a USB hub to connect several Hi-Speed devices. If you device requires a lot of power then this model is ideal as it has an optional aux power input (microUSB) so you can connect extra power to the connected device. Intona 7055-C SuperSpeed isolator $359 – Supports SuperSpeed, hi-speed, full speed and low speed.Works with some devices that the Hifime high speed isolator doesn’t support. Intona 7054 High Speed Isolator $229 – Hi-, full- and low speed modes and moderate power hungry devices.Hifime High Speed Isolator $99 – Hi-, full- and low speed modes and moderate power hungry devices.Hifime Full Speed Isolator $29 – Full speed or Low speed mode and not power hungry devices.If the device has phantom power for mics then it will require more power. Unfortunately most USB sound cards and devices doesn’t specify how much power they require, and this also varies depending on usage (output volume, sample rates etc). The isolators require some power for their own internal electronics and it varies how much is left to be supplies to the connected device. There are some DACs made specifically for Thunderbolt 3. It’s not equal to USB but all USB devices can be connected to a Thunderbolt 3 port. ![]() Then you have Thunderbolt 3 that uses the same connector as USB C.
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