What is the advantage or disadvantage of using a power supply voltage higher than the 5v you get through the usb to dc cable?

The USB power plug included, when plugged into the PC directly just have an overwhelming hiss. The hiss left when I used a 1A 5V USB charger, but the best sound came when I found an old large "wall-wart" 12V 1A with the same plug. The jump from 5V to 12V added a lot of warmth and detail. Get the linear supply wall-worts, not the switching kind (generally smaller in form-factor). I also used ferrite snap-on cores on the audio from the pc, high quality shielded audio cables. I'm most pleased with this unit when it's properly powered.

Is this a decent headphone amp for a turntable that has a built in pre amp?

Signal source is irrelevant as long as it is a low impedance line level.

Can someone post a link to a good DC power adapter for this sold on Amazon?

When I purchased this item recently from Amazon, I had a similar concern about the power supply, because I live in a 220V 50Hz electric supply zone. In my case, I received the amplifier with a charging cable having a standard (I think) plug on one end and a USB A plug on the other end. This end can be plugged into any phone charger with a USB A port. I found the amplifier works very well if this is also plugged in the USB port on the computer.

How do I pick another power supply for this? I’d like to replace it but don’t know how to figure out if something will work with this.

I’m using a Radio Shack 12volt 1000ma power adapter. It comes with different tip sizes so I used one that fit and that had a positive center like shown printed on the back (near the receptacle) of the amp. The range required of the Douk is 5 volts to 20 volts so mine being 12 volts is good. In the reviews someone commented that they had issues with using 5 volt chargers. That’s why I went with a little more power. Check your manual in case they made changes to this unit since the time bought it( earlier this year)

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Douk Audio U3 Mini Class A Headphone Amplifier HiFi Desktop Home Stereo Amp DC5V

Douk Audio U3 Mini Class A Headphone Amplifier HiFi Desktop Home Stereo Amp DC5V

Product ID: 573020882

Details

Brand
Douk Audio
Manufacturer
Douk Audio
Maximum Supply Voltage
20 Volts (DC)
Minimum Supply Voltage
5 Volts (DC)
Mounting Type
Freestanding

⚡Wide 5-20V input voltage

🔊1300mA Class A current output

🎛️Pluggable op amp socket

SAR 284

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Description

🎧 Elevate your desktop audio game with warm, customizable Class A power!

COMPACT YET MIGHTY - Miniature design packs big power, effortlessly driving high-impedance headphones like HD600, K701, and DT880 with rich detail.
VERSATILE VOLTAGE RANGE - Operates seamlessly from DC 5V up to 20V, ensuring consistent high-voltage 26V performance for pristine audio clarity.
CUSTOMIZABLE SOUND PROFILE - Easily upgrade and experiment with different op amps via the pluggable socket—perfect for audiophile DIY enthusiasts.
IMMERSIVE LISTENING EXPERIENCE - Wide frequency response and excellent transient response deliver smooth, transparent sound ideal for vocals, strings, and rock alike.
POWERFUL CLASS A AMPLIFICATION - Experience ultra-low distortion and warm, full-bodied sound with a 1300mA large current output transistor.

The Douk Audio U3 Mini is a compact Class A headphone amplifier designed for audiophiles seeking warm, low-distortion sound. Featuring a wide 5-20V input range, a powerful 1300mA current output, and a pluggable op amp socket for easy upgrades, it drives high-impedance headphones with exceptional clarity and dynamic range—perfect for home or office desktop setups.

Specifications

ASIN	B08C2MKBGN
Best Sellers Rank	#249,080 in Electronics ( See Top 100 in Electronics ) #421 in Hi-Fi Amplifiers
Brand Name	Douk Audio
Customer Reviews	4.4 4.4 out of 5 stars (801)
Included Components	16.35mm to 3.5mm Headphone Adapter, 1U3 Headphone Amplifier, 1*USB to DC Cable
Item Weight	168 g
Manufacturer	Douk Audio
Maximum Output Power	1.3W
Maximum Supply Voltage	20 Volts (DC)
Minimum Supply Voltage	5 Volts (DC)
Model Number	XZ-U3
Mounting Type	Freestanding
Number of Channels	2
Number of Items	1
Number of Packs	1
Output Power	1300 Milliwatts
Part Number	XZ-U3
Specification Met	RoHS
Unit Count	1 Count

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