Dreamcast:Digital Audio (SPDIF) Mod: Difference between revisions

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[[File:Dreamcast_SPDIF_Mod_3.jpg|thumb|Example completed install.]]
Original guide adapted from a [https://web.archive.org/web/20170626072614/https://www.assemblergames.com/threads/saturn-dreamcast-toslink.57670/ post by citrus3000psi].
Original guide adapted from a [https://web.archive.org/web/20170626072614/https://www.assemblergames.com/threads/saturn-dreamcast-toslink.57670/ post by citrus3000psi].


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#* [[File:Saturn SPDIF Mod 6.jpg|400px]]
#* [[File:Saturn SPDIF Mod 6.jpg|400px]]
# Assemble the Pep Audio PCB.
# Assemble the Pep Audio PCB.
# Bridge the "PS1" pad on the Pep Audio PCB to the pad next to it.
# Bridge the "SAT" pad on the Pep Audio PCB to the pad next to it (although it's for Saturn, it's the same setting for Dreamcast).
# On the top of the motherboard, solder wires from these legs on the DAC to the matching pads on the Pep Audio board.
# On the top of the motherboard, solder wires from these legs on the DAC to the matching pads on the Pep Audio board.
## `DATA` on motherboard to `DAT` on Pep Audio PCB ('''not''' `DATA`!).
## `DATA` on motherboard to `DAT` on Pep Audio PCB ('''not''' `DATA`!).
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# Partially reassemble, snaking the board past the metal shield as shown below:  
# Partially reassemble, snaking the board past the metal shield as shown below:  
#: [[File:Dreamcast_SPDIF_Mod_2.jpg|400px]]
#: [[File:Dreamcast_SPDIF_Mod_2.jpg|400px]]
# Mount the output jack on the case. Example completed install:
# Mount the output jack on the case.
#: [[File:Dreamcast_SPDIF_Mod_3.jpg|400px]]

Latest revision as of 16:23, 15 July 2023

Example completed install.

Original guide adapted from a post by citrus3000psi.

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

Required Materials

Installation

  1. There exists an issue (as noted by FireBrandX) with the Pep Audio PCB where some of the boards have extra ground fill in front of the pins and cause shorts. Use a multimeter to make sure none of the pads (GND excluded) have continuity to GND. If you do find continuity, you will need to use a hobby knife to cut off the area marked in red below:
    • Saturn SPDIF Mod 6.jpg
  2. Assemble the Pep Audio PCB.
  3. Bridge the "SAT" pad on the Pep Audio PCB to the pad next to it (although it's for Saturn, it's the same setting for Dreamcast).
  4. On the top of the motherboard, solder wires from these 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
  5. 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.
  6. Partially reassemble, snaking the board past the metal shield as shown below:
    Dreamcast SPDIF Mod 2.jpg
  7. Mount the output jack on the case.
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