Douk Audio D2 15W HiFi Linear Power Supply with DC+USB 5V Output

• Ultra-Low Ripple Output: With ripple noise below 20μV under no-load conditions, 15W output power, and up to 2.5A current, the D2 provides a low-noise power foundation for sensitive audio circuits that require stable 5V supply.

• Dual Output Convenience: Equipped with 1×USB-A and 1×DC output, the D2 can power two compatible 5V devices at the same time. Ideal for DACs, DDCs, Raspberry Pi, USB audio devices, and headphone amps etc.

• Stable Power Architecture: Built with a custom sealed transformer, LM1085IT voltage regulator, Panasonic FM capacitors, and PTC resettable fuse. The design helps deliver steady 5V output, low-ripple DC power, and added circuit protection.

• Compact Aluminum Chassis: The CNC-machined aluminum chassis offers solid durability, better heat dissipation, and helps reduce external interference. Compact and stack-friendly, the D2 fits neatly into desktop HiFi, PC audio, and small home audio systems.

Q: The D2 has two output terminals. Can both terminals be used simultaneously at full rated current?
A: No. You can connect two output devices at the same time, but the total current drawn from both outputs must not exceed the rated output current.

Q: The DC output jack is 5.5mm/2.5mm, and my device's power jack is 5.5mm/2.1mm. Are they compatible?
A: Yes.

Q: Is the output voltage of the D2 adjustable?
A: The output voltage is typically fixed and can only be fine-tuned within about ±0.5V. Normally no adjustment is required.

Q: If I connect two devices to the D2 at the same time, will ground noise occur?
A: It depends on the connected devices. If ground noise occurs when powering two devices, we recommend using the D2 to power only one device. 

Q: My device requires a 5V / 1A power supply. Can I safely use the D2 5V / 2.5A output?  
A: Yes. 2.5A is the maximum available current. Your device will only draw the current it needs, so it can be used safely.

Q: Why do the D2 generate more heat than switching power supplies? Is it safe?
A: It is normal. Linear power supplies operate at lower efficiency, so more energy is converted into heat. The D2 is safe when used within rated load limits.