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Raspberry Pi I2S S/PDIF Add-on Hat Configurable Inputs and Outputs
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DACBerry ONE for Pi Zero - OSA Electronics
HIFI PIFI Digital Sound Card SPDIF I2S Optical Fiber Module for Raspberry pi | eBay
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TinyTOSLINK (digital audio output) now for B+, too - Raspberry Pi Forums
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Raspberry Pi Pico as S/PDIF Digital Audio Receiver — Analyzes Signals and Converts to I2S | Elektor Magazine
ES9038PRO XMOS DSD DXD 768kHz USB DAC with SPDIF input and Bit-perfect volume control
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/i/214181/products/2019-11-10T14%3A16%3A12.880Z-M1II_191009_030.jpg?1606306133 "W-Input - S/PDIF to I2S digital input board from nihtila.com on Tindie")