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

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== Installation ==
== Installation ==


# There exists an issue (as noted by [https://shmups.system11.org/viewtopic.php?p=1425441&sid=e4913934cbae57d52de7db492efe8d16#p1425441 FireBrandX] with the Pep Audio PCB where some of the boards have extra ground fill in front of the pins and cause shorts. You may need to use a hobby knife to cut off the area marked in red below:
# There exists an issue (as noted by [https://shmups.system11.org/viewtopic.php?p=1425441&sid=e4913934cbae57d52de7db492efe8d16#p1425441 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:
#* [[File:Saturn SPDIF Mod 6.jpg|400px]]
#* [[File:Saturn SPDIF Mod 6.jpg|400px]]
# Assemble the Pep Audio PCB.
# Assemble the Pep Audio PCB.

Revision as of 23:11, 14 July 2023

Original guide adapted from a post by citrus3000psi. A good writeup about this mod can be found on FireBrandX's site.

This tutorial assumes you have a TDA1386T DAC chip in your Saturn.

Required Parts

Parts are dependent on if you want SPDIF or TOSLINK:

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.
  4. On the back of the motherboard, solder these four points to 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.
    Saturn SPDIF Mod 1.jpg
  5. Solder +5V to pin 7 of the TC9231N.
    Saturn SPDIF Mod 2.jpg
  6. 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 port.
    • If using a SPDIF port, connect DATA on the Pep Audio PCB to the data pin and GND to GND.
  7. Mount your SPDIF or TOSLINK PCB. This is one suggested location, but it may depend on what devices you may have installed in your unit.
    Saturn SPDIF Mod 3.jpg
  8. Mount your external jack. This is one suggested location, but may require trimming of the case.
    Saturn SPDIF Mod 4.jpg
  • Example completed install:
    Saturn SPDIF Mod 5.jpg