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USB/DC 5V 12V Battery Powered Ultra Low Noise Linear Power Supply for HIFI DAC

Item description

Features
  • Ultra-Low Noise Battery Power: Powered by a lithium battery instead of AC mains or USB bus power, it completely bypasses AC rectification and computer power noise. By isolating your system from household interference and ground noise, it delivers ultra-low noise down to 1µV, creating a quieter background and cleaner sound.  
  • LT3042 Precision Regulation: Built around the LT3042 linear regulator with PNP current expansion, it maintains ultra-low noise while delivering up to 2A current. Compared to traditional regulators, noise is reduced by 2–3 orders of magnitude, ensuring precise voltage regulation that remains clean and consistent even under demanding loads.  
  • Long Runtime Battery Design: Equipped with four Samsung 21700 lithium cells (20000mAh total), it delivers stable performance throughout the entire discharge cycle. Provides up to 7 hours at 5V/1.25A or 2 hours at 12V/2A, maintaining consistent power delivery during extended listening sessions.  
  • Safe Multi-Mode Operation: Supports charging-only, charging with power delivery, and battery-powered operation. Built-in overcharge, over-discharge, and surge protection manage battery safety automatically, while clear LED indicators provide instant visibility of charging, output, and battery status for worry-free operation.  
  • 5V / 12V Output Options: Available in 5V USB/DC or 12V aviation connector versions to match your equipment. Designed for DACs, streamers, USB interfaces, digital players, and other noise-sensitive electronics. Portable, quiet, and purpose-built to upgrade your power source, not just downstream sound.
Warm Tips
1.This product contains a built-in lithium battery. Please use only the included charging adapter. Do not use third-party fast chargers or high-power adapters.
2.Switch off both the charge switch and the output switch when the unit is not in use to reduce standby drain and extend battery life.  
3.Do not leave the unit charging or operating for extended periods without supervision, especially overnight.  
4.The maximum output is 2A (USB and DC outputs of 5V version share power). Avoid overload conditions. 
5.The 5V and 12V versions differ in input/output voltage, and output connector. All other core functions and operating modes are essentially the same.  
Parameters
  • Input voltage: 
    • 5V version: DC 9V
    • 12V version: DC 16.8V
  • Output voltage: DC 5V / DC 12V (Optional)
  • Maximum output current: 2A
  • Output interfaces:
    • 5V version: USB + DC (5.5mm x 2.1mm, center positive) 
    • 12V version: 2-pin aviation DC connector (pin 1 positive, pin 2 negative) 
  • Noise performance: down to approximately 1µV
  • Voltage adjustable range: ±5%
  • Built-in battery type: Samsung 21700 lithium battery
  • Battery configuration: 4 cells
  • Total battery capacity: 20000mAh
  • Typical runtime:
    • 5V version: ≈ 7 hours at 5V / 1.25A load
    • 12V version: ≈ 2 hours at 12V / 2A load
  • Typical charging time:
    • 5V version: ≈ 6 hours
    • 12V version: ≈ 3 hours
  • Dimensions (W*D*H): 100×155×47mm / 3.93× 6.10×1.85in
  • Net weight: 0.75kg / 1.65lb
  • Package weight: 1.2kg / 2.64lb
Packing List
  • 1* Linear Power Supply
  • 1* Charging Adapter
  • 1* DC cable (5.5 mm × 2.1 mm)
 
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Customs Clearance
We are NOT responsible for any customs duties fee.
We are NOT responsible for any import tax or customs delay.
 
Most item will be shipped within 2 working days. For package less than 2KG, we use Airmail (10-25 days to most countries) and for package over than 2KG we use Expedited Service such as DHL, UPS and FEDEX (5-8 days to most countries). 

Free Return Within 30 Days

We provide  return within 30 days for all items you bought on eBay, full refund and return shipping will be provided.

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

If you are satisfied with our products and service please leave a 5-star StarStarStarStarStar. Positive feedback rating Feedback is very important to us just like our lives, please DO contact us before you leave a neutral Neutral feedback rating or negative Negative feedback rating feedback, we will provide better solutions until you are satisfied.

 

 

 

Douk Audio / Nobsound Studio was founded in 2013 in Shenzhen CHINA, we own several brands including Douk Audio / Nobsound / Little Bear etc.
 
As a professional audio company, we are dedicated to design and produce the best products at the lowest prices to make HiFi affordable.
 
We will spare no efforts to bring great products and service for customers and extremely to improve our customers’ listening experience.
Please don't hesitate to contact us if you have any questions or comments about our items. And our working time is from Monday to Friday between 9:00 am to 06:00 pm(Beijing Time), which means we can keep on-line at:
 
 Working time

Beijing(CN)Monday-Friday09:00 AM - 18:00 AM
New York(US)
Sunday to Thursday08:00 PM - 05:00 AM
London(UK)Monday-Friday01:00 AM - 10:00 AM
Paris(FR)Monday-Friday02:00 AM - 11:00 AM
 
During holiday, please allow us to response you early next week. Please don't leave any negative / neutral feedback or make dispute/claim on our non-working time, thank you for your understanding and cooperation.
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