Hearing strange distortions

[CZ101]

Since that junk is not appearing in your RTX6001 plot, wouldn't that suggest it's common mode and being rejected?

Put a scope on the output of the dac, it should give you more info. <snip>

 

[nyt]

Since that junk is not appearing in your RTX6001 plot, wouldn't that suggest it's common mode and being rejected?

The noise is visible tip to ring and tip to sleeve, but not ring to sleeve...

 

[diyaudnut]

that spike at 70khz is only there when generating a signal. there's absolutely nothing on the fft normally. I linked the wrong fft earlier, should have just been the noise spectrum, which is flat.

Have you tried hooking it up with usb with the power and gnd lifted?

I am not sure i follow lifting power and ground.
Please clarify.

can this help?

Hifime High-Speed USB Isolator

Though i'm still not sure i understand the mechanism by which the noise grass is entering from USB to the DAC with EXAU2I isolation in place.
The laptop was running on battery during the measurement.

 

[nyt]

I am not sure i follow lifting power and ground.
Please clarify.

can this help?

Hifime High-Speed USB Isolator

Though i'm still not sure i understand the mechanism by which the noise grass is entering from USB to the DAC with EXAU2I isolation in place.
The laptop was running on battery during the measurement.

I meant just connecting the differential signal wires from the usb device

 

[diyaudnut]

I think EXAU2I uses USB power and has the isolator on the output I2S side.

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