pinout.vvzero.com/src/de/translate/justboom-digi-hat.md

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#Digi HAT

  • Dedicated S/PDIF output interface chip supports up to 192kHz / 24bit
  • Digital audio output over either optical (TOSLINK) or coaxial (RCA electrical) connectors
  • Low jitter, bit perfect digital output
  • Output transformer for galvanic isolation
  • Software volume control from your Raspberry Pi
  • Powered by the Raspberry Pi GPIO header
  • Optional IR receiver via GPIO25
  • All Raspberry Pi GPIO pins still accessible via 40pin unpopulated