BOSS I2S V 1.2

About the BOSS I2S V 1.2

The Allo BOSS I2S DAC v1.2 is a Raspberry Pi HAT-format digital-to-analog converter designed for high-quality stereo playback. It uses Texas Instruments’ PCM5122 DAC, dual low-phase-noise NDK master-clock oscillators for 44.1 kHz and 48 kHz clock families, ultra-low-noise voltage regulation, an analog low-pass filter, and an onboard EEPROM for automatic configuration. The board outputs analog audio through left/right RCA connectors and also provides an Allo Volt amplifier header. It operates as an I2S master, generating the audio clocks for compatible Raspberry Pi computers. Documentation and retailer listings identify Raspberry Pi 2 and 3 as the original supported platforms, while some later listings state compatibility with Raspberry Pi 4 and Raspberry Pi 5; software support depends on the operating system and device-tree overlay. The original product documentation does not clearly establish a formal end-of-life announcement, but the product appears to be an older/discontinued Allo design and is mainly encountered through remaining stock or specialist resellers.