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The specification specifies power: DC5V / 1A. I have a Huawei 5V / 2A battery charger, can this (2A) have a negative effect on DAC operation?
That charger will be fine. You do not want to exceed with Voltage. The Amp, or "current" is set by the device drawing the power. It will draw what it needs. But, if the device requires 2A, for example, and you plug in a 1A power source, then the device might not work or work poorly. But make sure you DO NOT plug the device into a plug that spits out more than 5V.
You can plug the power cord into another USB port, my D50 works with that. It is said D50 is designed to be USB-powered.
Also an option. Just left alone unused port of the USB. And there is a nuance - the port of the USB can be a source of electricity.
I wanted to write an electrical jammer
I just asked about the parameters of the USB port of the computer and it turned out that it issues 500mA and 5v, and the D50 requires a minimum of 1000mA
Yes, when the people who sold me D50 told me that would work (I did't buy it at Massdrop), I had the same doubt, but he was so sure about that then I gave it a try, and it did work. At the beginning, I was using a power charger (5V/1.5A, 5V/2.1A), but they were not stable, D50 will suddenly be no sound output, the operation and LCD display seems normal, but just no sound, I had to power off/on the device to make it work again. I told the seller about this situation, he suggested me that USB powered solution. Anyway now I am using a linear power supply happily. As you said, the USB powered method can be an option.