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LinearPi MkIII Ultra-low noise SMT Linear Power Supply
LinearPi MkIII Ultra-low noise SMT Linear Power Supply
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Introduction
New released in late 2025, 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.
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
- 5V, 3.3V and 12V configurations (15V is also possible)
- 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 and LinearPi Pro Comparison
|
LinearPi MkIII |
LinearPi Pro |
|
|
Max constant output current |
3A |
5A |
|
Total filtering capacitance |
15080uF |
29080uF |
|
Architecture |
Single power stage |
Parallel power stages |
|
PCB |
Four layers double thickness copper high current PCB with two additional shield layers |
Four layers double thickness copper high current PCB with two additional shield layers |
|
Ultra low Noise |
0.8uV RMS rated |
0.8uV RMS rated. Actual noise could be even lower because of the parallel power output stages and the additional shield layers |
|
Heat sink |
15X50X50 mm |
25X50X50 mm |
|
Schottky rectifiers |
High speed, high-current |
High speed, high-current, ultra-low drop |
|
Output Impendence (at 1KHz) |
3.5mOhm |
2.5mOhm |
Recommend transformers: 1182Q6 or 1182L6(parallel coils)
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:
- To use an external on/off switch, the on-board on/off switch must be kept at off position.
- 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.
