Dreamcast:Digital Audio (SPDIF) Mod

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Revision as of 16:13, 15 July 2023 by Derf (talk | contribs)
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Original guide adapted from a post by citrus3000psi.

This guide assumes the DAC in your Dreamcast is a PCM1725.

Required Materials

Installation

  1. On the top of the motherboard, solder wires from these four legs on the DAC to the matching pads on the Pep Audio board.
    1. DATA on motherboard to DAT on Pep Audio PCB (not DATA!).
    2. BCK on motherboard to BC on Pep Audio PCB.
    3. LRCK on motherboard to LRC on Pep Audio PCB.
    4. MCLK on motherboard to MC on Pep Audio PCB.
    5. +5 on motherboard to 5V on Pep Audio PCB.
    6. GND on motherboard to GND on Pep Audio PCB.
    Dreamcast SPDIF Mod 1.jpg
  2. Connect the output jack:
    • If using a TOSLINK port, connect +5V and GND to it. Also connect DATA (not DAT!) on the Pep Audio PCB to the In on the TOSLINK PCB.
    • If using your own SPDIF port, connect DATA on the Pep Audio PCB to the data pin and GND to GND.
  3. Partially reassemble, snaking the board past the metal shield as shown below:
    Dreamcast SPDIF Mod 2.jpg
  4. Mount the output jack on the case. Example completed install:
    Dreamcast SPDIF Mod 3.jpg