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A S/PDIF Free Space Digital Audio Optical Link
Building A 'high-end' USB Audio DAC | Hackaday
CS8416 S/PDIF decoder
24-Bit 192KHz PCM1793 DAC with DIR9001 Receiver and OPA2134 OPAMP
CM6631A 6631 CM6631 DAC Digital Interface USB to I2S/SPDIF Coaxial Decoder Board 32/24Bit 192K Sound Card DAC H098