{"product_id":"fosi-audio-psu20-3-channel-40w-linear-power-supply","title":"Fosi Audio PSU20 3-Channel 40W Linear Power Supply","description":"\u003ch3\u003eFosi Audio PSU20 3-Channel 40W Linear Power Supply\u003c\/h3\u003e  \u003cp\u003eUpgrade your Hi-Fi system with the Fosi Audio PSU20 3-Channel 40W Linear Power Supply, a premium power solution designed to deliver clean, stable, and reliable electricity to your favorite audio components. Featuring a custom 80W pure-copper toroidal transformer, three fully isolated power output channels, and ultra-low ripple noise as low as 0.1mV, the PSU20 provides a refined alternative to conventional switching power adapters. With two selectable DC outputs and one USB-A power output, the PSU20 can power up to three compatible devices simultaneously, making it an excellent addition to systems built around DACs, headphone amplifiers, CD transports, and stereo preamplifiers.\u003c\/p\u003e  \u003cp\u003eDesigned to minimize electrical interference and preserve audio system performance, the PSU20 uses a carefully engineered linear power architecture with independent rectification, filtering, voltage regulation, and protection circuits for each output channel. Unlike conventional switching power supplies, which rely on high-frequency switching circuits, the PSU20 uses linear regulation to provide a stable DC output with a controlled noise profile. Premium Nippon Chemi-Con capacitors help reduce unwanted voltage fluctuations and electrical ripple, while a high-performance rectifier and dedicated voltage regulators support clean, consistent power delivery. This approach can help reduce power-related interference in compatible audio equipment, particularly sensitive low-noise components.\u003c\/p\u003e  \u003cp\u003eFlexibility is one of the PSU20's greatest advantages. Its first DC output provides selectable 12V or 15V power with a maximum rated output of 20 watts, while the second DC output offers selectable 5V or 12V power with a maximum rating of 15 watts. A dedicated USB-A connection supplies 5V\/1A power for compatible USB-powered devices. Together, these three independently isolated outputs deliver a combined rated capacity of 40 watts, allowing listeners to replace multiple individual power adapters with one centralized power solution. The included DC-to-DC power cables help reduce cable clutter while creating a cleaner, more organized audio system.\u003c\/p\u003e  \u003cp\u003eInside the PSU20 is a custom pure-copper toroidal transformer rated at 80 watts with a peak capability of up to 100 watts, providing the foundation for stable power conversion and regulation. Its GBU806 rectifier bridge is rated for 600V and 8A, while three LM1085IT regulators and one ST78M05 regulator provide carefully controlled voltage delivery. Each output channel operates through dedicated regulation and protection circuitry to help prevent electrical interaction between connected components. With ripple levels as low as 0.1mV, the PSU20 is engineered to support sensitive audio electronics that benefit from consistent, low-noise power.\u003c\/p\u003e  \u003cp\u003eFor reliable long-term operation, the PSU20 incorporates automatic thermal management and multiple electrical protection systems. A custom low-noise cooling fan activates when the internal temperature reaches approximately 55°C (131°F), operating at a rated noise level of just 30dB. Built-in over-temperature, overvoltage, and overcurrent protection help safeguard the power supply and compatible connected equipment. Its durable desktop enclosure and unified component styling allow it to integrate naturally into modern Hi-Fi systems. Whether you're powering a dedicated headphone listening station, a desktop DAC and preamplifier combination, or multiple compatible low-voltage audio components, the Fosi Audio PSU20 delivers a convenient, organized, and performance-focused power solution.\u003c\/p\u003e  \u003ch4\u003eSpecifications\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fosi Audio\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e PSU20\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e 3-channel linear DC power supply\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Supply Design:\u003c\/strong\u003e Linear regulated power supply\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Output Channels:\u003c\/strong\u003e 3 fully isolated channels\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMaximum Connected Devices:\u003c\/strong\u003e 3 compatible devices simultaneously\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTotal Rated Output Power:\u003c\/strong\u003e 40 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTransformer:\u003c\/strong\u003e Custom pure-copper toroidal transformer\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTransformer Rating:\u003c\/strong\u003e 80 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTransformer Peak Power:\u003c\/strong\u003e Up to 100 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAC Power Input:\u003c\/strong\u003e 1 × AC mains power connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAC Voltage Selection:\u003c\/strong\u003e Manual 115V\/230V selection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e115V Setting:\u003c\/strong\u003e Supports 100–120V AC, 60Hz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e230V Setting:\u003c\/strong\u003e Supports 220–240V AC, 50Hz\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDC Power Outputs:\u003c\/strong\u003e 2 DC barrel-style power connections\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB Power Output:\u003c\/strong\u003e 1 USB-A connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDC Output 1 Voltage:\u003c\/strong\u003e Selectable 12V or 15V DC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDC Output 1 Rated Power:\u003c\/strong\u003e 20 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDC Output 2 Voltage:\u003c\/strong\u003e Selectable 5V or 12V DC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDC Output 2 Rated Power:\u003c\/strong\u003e 15 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB-A Output Voltage:\u003c\/strong\u003e 5V DC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB-A Output Current:\u003c\/strong\u003e 1A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eUSB-A Output Rated Power:\u003c\/strong\u003e 5 watts\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eSupported Output Voltages:\u003c\/strong\u003e 5V, 12V, and 15V DC\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOutput Isolation:\u003c\/strong\u003e Independent rectification, filtering, regulation, and protection for each channel\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Regulation:\u003c\/strong\u003e Four linear regulator components\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLinear Regulators:\u003c\/strong\u003e 3 × LM1085IT and 1 × ST78M05\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRectifier Bridge:\u003c\/strong\u003e GBU806\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRectifier Voltage Rating:\u003c\/strong\u003e 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRectifier Current Rating:\u003c\/strong\u003e 8A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCapacitors:\u003c\/strong\u003e Premium Nippon Chemi-Con capacitors\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOutput Ripple:\u003c\/strong\u003e As low as 0.1mV\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling System:\u003c\/strong\u003e Automatic temperature-controlled cooling fan\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling Fan Activation Temperature:\u003c\/strong\u003e 55°C (131°F)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCooling Fan Noise Level:\u003c\/strong\u003e Approximately 30dB\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOver-Temperature Protection:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOvervoltage Protection:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOvercurrent Protection:\u003c\/strong\u003e Yes\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOperating Temperature Range:\u003c\/strong\u003e -20°C to 40°C (-4°F to 104°F)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFull-Load Temperature Rise:\u003c\/strong\u003e Approximately 25°C (77°F)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatible Equipment:\u003c\/strong\u003e Devices requiring supported DC voltages, power levels, polarity, and connectors\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRecommended Applications:\u003c\/strong\u003e Compatible DACs, CD transports, headphone amplifiers, preamplifiers, and low-voltage audio accessories\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Distribution:\u003c\/strong\u003e Three independent output channels with a combined 40W rating\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Cable Length 1:\u003c\/strong\u003e 1.2 meters (47.2 inches)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePower Cable Length 2:\u003c\/strong\u003e 0.3 meters (11.8 inches)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCertifications:\u003c\/strong\u003e CE, FCC, and RoHS\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eEAN:\u003c\/strong\u003e 6976136961482\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAnalog Audio Inputs:\u003c\/strong\u003e None\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDigital Audio Inputs:\u003c\/strong\u003e None\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAudio Outputs:\u003c\/strong\u003e None; all three outputs provide electrical power only\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e12V Trigger:\u003c\/strong\u003e No dedicated 12V trigger connection\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBuilt-In Audio Amplifier:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBluetooth Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eWi-Fi Connectivity:\u003c\/strong\u003e No\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer Warranty:\u003c\/strong\u003e 24-month limited warranty\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIncluded Accessories:\u003c\/strong\u003e Fosi Audio PSU20 Linear Power Supply, 1.2m DC-to-DC power cable, 0.3m DC-to-DC power cable, AC power cord, and user manual\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eWhat It's Great At\u003c\/h4\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eClean, Low-Noise Power Delivery:\u003c\/strong\u003e Linear regulation, premium capacitors, and ripple noise as low as 0.1mV help reduce unwanted power-supply interference in compatible Hi-Fi equipment.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003ePowering Three Components Simultaneously:\u003c\/strong\u003e Two DC outputs and one USB-A connection provide a combined 40 watts of rated power for compatible DACs, headphone amplifiers, CD transports, preamplifiers, and audio accessories.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eFully Isolated Power Channels:\u003c\/strong\u003e Independent rectification, filtering, regulation, and protection circuitry for each output helps minimize electrical interaction between connected components.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eFlexible Voltage Selection:\u003c\/strong\u003e Selectable 5V, 12V, and 15V DC output options accommodate a wide range of supported low-voltage audio devices.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003ePremium Power Supply Components:\u003c\/strong\u003e An 80W pure-copper toroidal transformer, Nippon Chemi-Con capacitors, a GBU806 rectifier, and dedicated linear regulators provide a robust foundation for consistent power delivery.\u003c\/li\u003e  \u003cli\u003e\n\u003cstrong\u003eReliable, Quiet Operation:\u003c\/strong\u003e An automatic 30dB cooling fan and built-in over-temperature, overvoltage, and overcurrent protection support stable operation during extended listening sessions.\u003c\/li\u003e \u003c\/ul\u003e  \u003ch4\u003eFAQ Section\u003c\/h4\u003e  \u003cp\u003e\u003cstrong\u003eQ: What is the Fosi Audio PSU20 used for?\u003c\/strong\u003e\u003cbr\u003e A: The Fosi Audio PSU20 is a 3-channel linear power supply designed to deliver clean, stable DC power to compatible audio components. It can replace multiple individual power adapters while supplying electricity to devices such as DACs, headphone amplifiers, CD transports, and stereo preamplifiers. It is not an audio amplifier or signal-processing device.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: How many devices can the Fosi Audio PSU20 power simultaneously?\u003c\/strong\u003e\u003cbr\u003e A: The PSU20 can power up to three compatible devices at the same time. It features two DC barrel outputs and one USB-A power output, providing a combined rated output of 40 watts. The connected devices must remain within the voltage and power limits of their respective outputs.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What power outputs does the Fosi Audio PSU20 have?\u003c\/strong\u003e\u003cbr\u003e A: The PSU20 provides three isolated outputs. DC Output 1 offers selectable 12V or 15V power with a maximum rating of 20 watts, DC Output 2 offers selectable 5V or 12V power rated at 15 watts, and the USB-A output provides 5V\/1A power rated at 5 watts. All three outputs are dedicated to supplying electrical power rather than carrying audio signals.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: What is the benefit of a linear power supply for Hi-Fi audio?\u003c\/strong\u003e\u003cbr\u003e A: A linear power supply uses transformer-based power conversion and linear voltage regulation to provide stable DC power with a controlled noise profile. The PSU20 offers ripple levels as low as 0.1mV, which may help reduce power-related interference in sensitive audio equipment. The degree of audible improvement depends on the connected components and their internal power regulation.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Can I use the Fosi Audio PSU20 with any DAC or headphone amplifier?\u003c\/strong\u003e\u003cbr\u003e A: The PSU20 works with compatible audio equipment that meets its voltage, current, power, connector, and polarity requirements. Before connecting a device, verify that it operates at the selected output voltage and that its power consumption does not exceed the rating of the chosen PSU20 output. Devices requiring higher power levels or different electrical specifications should not be connected.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio PSU20 have a cooling fan?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The PSU20 includes a temperature-controlled cooling fan that automatically activates when its internal temperature reaches approximately 55°C (131°F). The fan operates at a rated noise level of approximately 30dB and helps maintain stable performance during extended use.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio PSU20 include electrical protection features?\u003c\/strong\u003e\u003cbr\u003e A: Yes. The PSU20 includes over-temperature, overvoltage, and overcurrent protection to help safeguard the power supply and connected audio equipment. Each of its three output channels incorporates dedicated regulation and protection circuitry for stable, isolated power delivery.\u003c\/p\u003e  \u003cp\u003e\u003cstrong\u003eQ: Does the Fosi Audio PSU20 have audio inputs, outputs, or a 12V trigger?\u003c\/strong\u003e\u003cbr\u003e A: No. The PSU20 is a dedicated electrical power supply and does not include analog or digital audio connections or a dedicated 12V trigger. It features one AC mains input and three DC power outputs: two barrel-style DC outputs and one USB-A power output. Its 12V settings supply continuous DC power rather than trigger-control signals.\u003c\/p\u003e","brand":"Fosi Audio","offers":[{"title":"Default Title","offer_id":62887255408799,"sku":"FOS-PSU20-BLK","price":199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0495\/6910\/4031\/files\/4dd47364-0ad1-4112-8e37-5012882bf5fa.jpg?v=1791563867","url":"https:\/\/listenup.com\/products\/fosi-audio-psu20-3-channel-40w-linear-power-supply","provider":"ListenUp","version":"1.0","type":"link"}