The Fosi Audio PSU20 is a 40W linear power supply with an 80W toroidal transformer, ripple rated as low as 0.1mV and three isolated outputs (two DC plus USB-A) set to 5V, 12V or 15V. It suits desktop setups where a DAC, headphone amp, preamp or CD transport now runs on its own wall adapter.
Who the Fosi Audio PSU20 is for
Fosi desktop stacks: Fosi built it for its own components, and DC 1 supplies 12V or 15V at up to 20W for a desktop DAC or headphone amp.
Fewer wall adapters: Two DC outputs and a USB-A port run up to three devices from one AC outlet, with 1.2m and 0.3m DC-DC cables in the box.
Mixed-voltage gear: Each port has its own setting (DC 1 at 12V/15V, DC 2 at 5V/12V, USB-A at 5V/1A), so 15V, 12V and 5V devices can share one supply.
Noise-conscious systems: Every output has its own rectification, filtering, regulation and protection circuit, and Fosi rates ripple as low as 0.1mV.
Skip it if: a device needs more than 20W from one port or a voltage other than 5V, 12V or 15V; 19V, 24V, 32V and 48V power amps need their own supply.
Fosi Audio PSU20 key specs
Rated output: 40W total (DC 1 20W, DC 2 15W, USB-A 5W)
DC 1: 12V or 15V, 20W rated
DC 2: 5V or 12V, 15W rated
USB-A: 5V/1A, 5W rated
Transformer: 80W pure-copper toroidal, up to 100W peak
Regulation: Three LM1085IT and one ST78M05 linear regulators, GBU806 600V/8A rectifier, Nippon Chemi-Con capacitors
Ripple: As low as 0.1mV (Fosi rating)
Cooling and protection: Low-noise fan starts at 55°C (30dB); over-temperature, over-voltage and over-current protection
AC input: Switchable 115V (100–120V) or 230V (220–240V)
In the box: PSU20, 1.2m and 0.3m DC-DC cables, AC power cord, user manual
Genuine Fosi Audio stock. Free shipping on every order, 45-day returns.
Fosi Audio PSU20 vs similar options
vs FiiO JadeAudio PL50: Covers 12V and 15V for USB DACs that take an external feed; pick the PSU20 if you also need 5V and a USB-A port to power up to three devices from one supply.
vs FiiO Darkside Pro: Offers an adjustable output voltage in Silver or Black; pick the PSU20 to run up to three devices at 5V, 12V or 15V from one unit.
Yes. Every unit we sell is genuine and brand-new, shipped in its original packaging, and backed by our 1-year TonePier warranty and 45-day returns.
Where does my order ship from, and how long does it take?
Every order ships from our warehouse in China, with full tracking, and most orders ship within 3 business days. Shipping is free on every order; most US orders arrive within 7–15 business days and most orders to other countries within 7–20 business days — see our shipping policy for details.
What if it isn't for me?
You get 45 days to decide. Keep the packaging, keep it in like-new condition, and send it back for a refund. Ear tips unsealed for hygiene reasons are fine — we expect you to actually listen.
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