Fosi Audio PSU20 3-Channel 40W Audiophile Linear Power Supply (Black)

The Fosi Audio PSU20 Linear Power Supply provides reference-grade electrical isolation and ultra-low noise performance for discerning high-fidelity audio systems. Built to replace noisy conventional switching power adapters (SMPS), the PSU20 utilizes a custom-wound 80-watt pure copper toroidal transformer capable of delivering up to 100 watts of transient peak power. This robust magnetic core feeds an advanced 40-watt linear regulation stage engineered with high-current Nippon Chemi-Con filter capacitors and a quad-core Texas Instruments linear regulator array (ST78M05 and triple LM1085IT), suppressing AC mains ripple down to an astonishing 0.1 mV for an ultra-quiet, pitch-black sonic background.

Engineered to power complex desktop audio stacks from a single consolidated power source, the PSU20 features three completely isolated DC output channels with dedicated rectification, filtering, regulation, and protection circuitry. Output 1 provides switchable 12V / 15V (up to 20W), Output 2 delivers switchable 12V / 5V (up to 15W), and Output 3 offers a clean 5V / 1A USB-A power feed, effortlessly driving CD transports, DACs, phono preamplifiers, and headphone amplifiers simultaneously without inter-component ground loops. Housed in a heavy-duty extruded black aluminum chassis with automatic 55°C temperature-controlled whisper-quiet active cooling (30 dB), the PSU20 ensures long-term thermal stability and comprehensive over-voltage, over-current, and short-circuit protection.

Features:

• Three Independent Isolated DC Outputs: Powers up to three audio components simultaneously without ground loops or inter-channel electrical crosstalk.
• Ultra-Low 0.1mV Ripple Voltage: Quad-core Texas Instruments linear regulators and Nippon Chemi-Con capacitors drastically reduce noise floor for enhanced micro-detail and soundstage depth.
• 80W Custom Pure Copper Toroidal Transformer: Delivers stable, low-radiation electromagnetic linear power with high current reserves for dynamic musical peaks.
• Selectable Multi-Voltage Versatility: Features dual switchable DC barrel outputs (12V/15V and 5V/12V) plus a dedicated 5V/1A USB-A power port to accommodate DACs, preamps, and streamers.
• Robust Discrete Rectification Architecture: Incorporates a high-reliability GBU806 600V/8A bridge rectifier to ensure rock-solid AC-to-DC conversion stability.
• Intelligent Whisper-Quiet Thermal Management: Low-noise cooling fan automatically engages above 55°C, operating at a quiet 30 dB during demanding listening sessions.
• Comprehensive Audio Component Protection: Built-in safety circuits safeguard valuable connected gear with over-temperature, over-voltage, over-current, and short-circuit protection.
• Heavy-Duty Aluminum Enclosure: Resilient extruded matte black aluminum casing provides superior electromagnetic shielding and complements modern desktop audio stacks.

Specifications: