LinearPi MkIII 2027 Ultra-low noise SMT Linear Power Supply

Introduction

LinearPi MkIII is a great-quality high current ultra-low noise audiophile grade linear power supply. It’s a big step forward upgrade over the LinearPi MkII using technologies from LinearPiPro. It can deliver up to 3A continuous output current at extremely low-noise level which is much suitable for noise sensitive audio applications. It could be one of the best linear power supply solutions for both digital and analog audio circuits. By using a UcConditioner/Pro, it can be upgraded  to an higher level 5V/3.3V ultracapacitor hybrid power supply.  LinearPi MkIII can also be grouped into a power supply system by the ON/OFF control chain.

Launched in late 2026, the New LinearPi MkIII 2027 represents a further refinement of our ultra-low-noise linear power supply platform, with improvements focused on lower noise, greater flexibility, and enhanced manufacturing quality.

Specification s and Highlighted Features

• 0.8uV Ultra low noise level
  
• Ultra low output impedance
  
• Built in on/off control logic with on board or possible external on/off control switch
• Multiple LinearPi MkIII s can be grouped as a whole power supply system by making use of the built in isolated master/slave control signal chain.
• Seamlessly integrates with UcConditioner to upgrade to an ultra capacitor power supply
• Optimized for continuous AC input mode to get best possible sound quality
• Deal with MLCC piezoelectric effect noise
  
• Two stages ultra-low noise soft start up feature great for both digital and analog application.
• Fully SMT high-quality heavy-duty design.

LinearPi MkIII New Features

• 3A high continuous output current.
• 3.5 mOhm ultra-low output impendence (1kHz).
• 4 layers double copper thickness PCB for higher current density and additional shield layers.
• 15080 uF total filtering capacitance.
• Enhanced optional Kelvin sense input to lower the output impedance and improve performance.
• Ultra-low ESR polymer solid output capacitors.
• New high speed high current soft recovery Schottky rectifiers.
• USB-C output connector on top.
• Slightly larger PCB size.

LinearPi MkIII 2027 New Features and Improvements

• Upgraded Internal Voltage-Reference Filtering
  Upgraded with higher-performance SMT film capacitor as an ultra-low-noise filter for the internal voltage reference, further reducing overall output noise to an even lower level.
• Flexible Output-Voltage Configurations
  Supports 3.3V, 5V (default), 9V, and 12V output configurations. 15V is also available as an optional configuration upon request.
• Fast Start-Up Option
  A fast start-up option is available for applications requiring a shorter power-on time.
• Precision Engineering and Manufacturing
  Designed and manufactured with precision engineering and meticulous attention to detail, ensuring a high level of hardware quality, reliability, and production consistency.
  

LinearPi MkIII and LinearPi Pro Comparison

LinearPiMkIII 2027 User's Manual

DXF file of LinearPiMkIII 2027

(Old)LinearPi MkIII User's manual

Possible Accessories:

Standoff/Screw sets #34B  (optional to mount UcConditioner or stack on top)

Fork spade terminal connectors

External ON/OFF switch (optional)

55A CmChoker Common Mode Noise Filter (Optional)

Upgrade with a UcConditioner Pro 5V

NOTE: 

1. To use an external on/off switch, the on-board on/off switch must be kept at off position.
2. Please don't use the USB-C output for configurations other than 5V. LineraPi doesn't support hot plug. Please only plug or unplug the USB-C connector (either at power supply or at device side) when LinearPi is off and then turn on the LinearPi after the connector is well plugged.