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This is a bare PCM2704 USB DAC board that takes 5V power from a USB port and outputs analog audio through a headphone jack and line-level terminals. It is a DIY part, not a finished sound card: you solder or wire it into your own build. The PCM2704 is a classic USB audio chip with 16-bit, 32/44.1/48 kHz playback and no driver needed on Windows, macOS or Linux. It suits tinkerers and Raspberry Pi or retro-PC builders who want a cheap USB-to-analog path, but it cannot match a modern external DAC on resolution or noise.
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Owners treat this as a cheap, functional PCM2704 module that works without drivers and sounds clean for the price. Most complaints center on the low output power and the bare-board format.
This is a mini USB sound card and DAC decoder board built around the PCM2704 chip. It takes 5 V power over USB and connects to a PC or computer to decode digital audio.
It has a signal-to-noise ratio and dynamic range of 98 dB. Total harmonic distortion plus noise is 0.006% with loads above 10 kΩ and 0.025% with a 32 Ω load. Headphone output power is 12 mW into 32 Ω.