The Fosi Audio PSU20 is a high-performance linear power supply designed to provide clean, stable power to multiple audio components simultaneously. With an 80W toroidal transformer, ultra-low 0.1 mV ripple, three isolated outputs and selectable 5V, 12V and 15V voltages, PSU20 is an ideal upgrade for DACs, headphone amplifiers, preamps and other compatible audio equipment.

Power Up to Three Devices

PSU20 features two DC outputs and one USB-A output, allowing you to power up to three compatible devices from a single unit.

The selectable outputs provide:

DC 1: 12V / 15V, up to 20W
DC 2: 5V / 12V, up to 15W
USB: 5V / 1A, up to 5W

Always match the output voltage and power requirements of your connected equipment before use.

Ultra-Low Ripple

The PSU20 uses premium Nippon Chemi-Con capacitors and a multi-stage linear regulation design to achieve ripple as low as 0.1 mV.

Its clean power delivery is designed to minimize unwanted electrical noise and provide a quieter foundation for high-fidelity audio systems.

80W Toroidal Transformer

A custom pure-copper toroidal transformer provides stable power delivery with up to 100W peak output, even when multiple devices are connected.

The transformer is paired with a high-reliability GBU806 rectifier bridge and multiple linear regulators for consistent voltage regulation.

Three Fully Isolated Outputs

Each output has dedicated rectification, filtering, regulation and protection circuitry, helping prevent interference between connected devices.

This makes PSU20 particularly useful for simplifying a multi-component desktop audio system.

Quiet and Protected

A low-noise cooling fan activates at approximately 55°C and operates at around 30 dB.

Built-in over-temperature, over-voltage and over-current protection helps safeguard both the PSU20 and connected equipment during everyday use.

Key Features
Linear power supply for high-fidelity audio equipment
Power up to 3 devices simultaneously
80W toroidal transformer
Up to 100W peak output
Ultra-low ripple as low as 0.1 mV
Three fully isolated outputs
Selectable 5V / 12V / 15V
DC 1: 12V / 15V, 20W
DC 2: 5V / 12V, 15W
USB-A: 5V / 1A, 5W
Nippon Chemi-Con capacitors
Linear regulation architecture
Over-temperature, over-voltage and over-current protection
Low-noise cooling fan
115V / 230V AC input