Linear Power Supply 5V 12V for HiFi DAC Audio Interface Headphone Amp Preamp

Linear Power Supply 5V 12V for HiFi DAC Audio Interface Headphone Amp Preamp Description

Cleaner Power for Audible Improvement: Reduces ripple noise commonly introduced by switching power supplies. By delivering clean, stable energy, D2/D2 PRO helps create a darker background, better instrument separation, and smoother highs, supporting more natural and detailed music reproduction. Flexible Dual-Output Power: D2 delivers regulated 5V power via USB and DC outputs, while D2 PRO provides stable 12V through dual DC outputs. Both support parallel output to power two compatible devices simultaneously. Ideal for DACs, headphone amps, digital interfaces, streamers, and more.

• View All Categories
  • Add-on Items
  • Record Player & Turntable Part

• Audio Board & DIY Kit
• Audio Player & Turntable Parts

Sign Up Now ! Linear Power Supply 5V 12V for HiFi DAC Audio Interface Headphone Amp Preamp Item description Features

• Cleaner Power for Audible Improvement: Reduces ripple noise commonly introduced by switching power supplies. By delivering clean, stable energy, D2/D2 PRO helps create a darker background, better instrument separation, and smoother highs, supporting more natural and detailed music reproduction.

• Flexible Dual-Output Power: D2 delivers regulated 5V power via USB and DC outputs, while D2 PRO provides stable 12V through dual DC outputs. Both support parallel output to power two compatible devices simultaneously. Ideal for DACs, headphone amps, digital interfaces, streamers, and more.

• Ultra-Low Ripple Performance: Ripple noise is suppressed to the microvolt range (23μV for D2; 28μV for D2 PRO), far lower than ordinary power adapters. This helps reduce power-related interference, supporting cleaner transients, stable dynamics, and reliable operation for sensitive audio circuits.

• Designed for HiFi Systems: Housed in a CNC-machined aluminum alloy chassis to block external RFI/EMI and enhance heat dissipation. Designed for Douk Audio/Nobsound gear and other 5V/12V components, it helps unlock more performance potential in your desktop or home theater systems.

Q: The D2 and D2-PRO have 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 curent drawn from both outputs must not exceed the rated output current.

Q: The DC output jacks of D2/D2-PRO are 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 / D2-PRO adjustable?
A: The output voltage is typically fixed and can only be fine-tuned within a ±0.5V range. Normally no adjustment is required. If necessary, adjustment can be made via the internal potentiometer after removing the front and rear panels.

Q: If I connect two devices to the D2 or D2-PRO at the same time, will ground noise occur?
A: It is possible, depending on the characteristics of the two connected devices. If noise is present, it is recommended to use the D2 or D2-PRO to power only one device.

Q: My device requires a 12V / 1A power supply. Can I safely use the D2-PRO (12V / 2.5A)?
A: Yes. The 2.5A rating indicates the maximum available current. Your device will only draw the current it requires. Using a higher-current power supply provides better headroom and can improve stability.

Q: Why do the D2 and D2-PRO generate more heat than switching power supplies? Are they safe?
A: It is normal. Linear power supplies operate at lower efficiency (about 50–80%), so more energy is converted into heat. The D2 and D2-PRO are safe when used within rated load limits. For long periods of inactivity, it is recommended to turn off the unit.

Parameters Brand Douk Audio Model D2 D2 PRO Output Interface DC / USB Port Dual DC Ports Output Voltage DC 5V DC 12V Max. Output Power 15W 35W (No load: 0.5W) Max. Output Current 2.5A 2.5A Ripple Noise No load: 23μV No load: 28μV; Full load < 200μV Fuse Replacement Not supported Supported (5mm × 20mm, 1A) DC Output Connector 5.5 × 2.5 mm (Positive inside, negative outside) Input Voltage AC 110V–120V / AC 220V–240V Dimensions (W × D × H) 125 × 80 × 40 mm / 4.92 × 3.15 × 1.57 in 110 × 155 × 63 mm / 4.33 × 6.10 × 2.48 in Net Weight 601 g / 1.32 lb 689 g / 1.52 lb Packing List

• 1* D2 / D2 PRO (Optional)
• 1* User Manual

1-year warranty is provided for all items(Excluding: 1. Man-made damage or misuse. 2. Audio accessories and consumables such as vacuum tubes).

Douk Audio / Nobsound / Little Bear etc. Working time

Beijing(CN) New York(US)
Sunday to Thursday London(UK) Paris(FR)