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

Features Cleaner 5V Linear Power: Replaces ordinary switching power adapters with clean, stable 5V DC power. The D2 helps reduce power-related noise and interference, giving your HiFi system a darker background, smoother highs, and more natural detail. 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. Parameters Brand: Douk Audio Model: D2 Output Interface: DC / USB Port Output Voltage: DC 5V Output Power: 15W Rated Output Current: 2.5A Ripple Noise: No load <20μV DC Output Connector: 5.5 × 2.5 mm, positive inside and negative outside, compatible with 5.5 × 2.1 mm Input Voltage: AC 110V–120V / AC 220V–240V Dimensions (W × D × H): 125 × 80 × 40 mm / 4.92 × 3.15 × 1.57 in Net Weight: 600 g / 1.32 lb Package Weight: 900 g / 1.98 lb Packing List 1* D2 1* DC Cable 1* Power Cable