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

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Parts are dependent on if you want SPDIF or TOSLINK:
Parts are dependent on if you want SPDIF or TOSLINK:
* SPDIF:
* SPDIF:
** [https://oshpark.com/shared_projects/dmxP90H4 PEP Audio 1.1 - SPDIF PCB by citrus3000psi]
** [https://oshpark.com/shared_projects/kvtStGOq Pep Audio 1.2 PCB by citrus3000psi]
** [https://oshpark.com/shared_projects/b9Fjt84V SPDIF Narrow PCB by citrus3000psi]
** TX178A (SPDIF port)
** TX178A (SPDIF port)
** 0.1uF capacitor
** 0.1uF capacitor


* TOSLINK:
* TOSLINK:
** [https://oshpark.com/shared_projects/kvtStGOq PEP Audio 1.2 - TOSLINK PCB by citrus3000psi]
** [https://oshpark.com/shared_projects/kvtStGOq PEP Audio 1.2 PCB by citrus3000psi]
** TC7W04FK chip
** TC7W04FK chip
** TC9231N chip
** TC9231N chip
** Two 0.1uF capacitor (0603 size)
** Two 0.1uF capacitor (0603 size)


== SPDIF Installation ==
== Installation ==


# Assemble the PEP Audio PCB.
# There exists an issue with the Pep Audio PCB where extra ground can 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:
# On the back of the motherboard, solder these four points to your SPDIF board, matching the names up.
#* [[File:Saturn SPDIF Mod 6.jpg|400px]]
# Assemble the Pep Audio PCB.
# Bridge the "SAT" pad on the Pep Audio PCB to the pad next to it.
# On the back of the motherboard, solder these four points to the Pep Audio board.
## `DATA` on motherboard to `DAT` on Pep Audio PCB ('''not''' `DATA`!).
## `BCK` on motherboard to `BC` on Pep Audio PCB.
## `LRCK` on motherboard to `LRC` on Pep Audio PCB.
## `MCLK` on motherboard to `MC` on Pep Audio PCB.
#: [[File:Saturn SPDIF Mod 1.jpg|400px]]
#: [[File:Saturn SPDIF Mod 1.jpg|400px]]
# Solder +5V to pin 7 of the TC9231N and connect GND to your SPDIF board.
# Solder +5V to pin 7 of the TC9231N.
#: [[File:Saturn SPDIF Mod 2.jpg|400px]]
#: [[File:Saturn SPDIF Mod 2.jpg|400px]]
# Mount your SPDIF PCB. This is one suggested location, but it may depend on what devices you may have installed in your unit.
# Connect the output jack:
#: [[File:Saturn SPDIF Mod 3.jpg|400px]]
#* 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.
# Mount your external jack. This is one suggested location, but may require trimming of the case.
#* If using a SPDIF port, connect `DATA` on the Pep Audio PCB to the data pin and GND to GND.
#: [[File:Saturn SPDIF Mod 4.jpg|400px]]
# 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.
* Example completed install:
*: [[File:Saturn SPDIF Mod 5.jpg|400px]]
 
== TOSLINK Installation ==
 
# Assemble the PEP Audio PCB.
# Bridge the "SAT" pad on the PEP Audio PCB to the pad next to it.
# On the back of the motherboard, solder these four points to your TOSLINK adapter:
## DATA on motherboard to DAT on PEP Audio PCB.
## BCK on motherboard to BC on PEP Audio PCB.
## LRCK on motherboard to LRC on PEP Audio PCB.
## MCLK on motherboard to MC on PEP Audio PCB.
#: [[File:Saturn SPDIF Mod 1.jpg|400px]]
# Solder +5V to pin 7 of the TC9231N and connect GND to your TOSLINK adapter.
#: [[File:Saturn SPDIF Mod 2.jpg|400px]]
# Mount your SPDIF/TOSLINK PCB. This is one suggested location, but it may depend on what devices you may have installed in your unit.
#: [[File:Saturn SPDIF Mod 3.jpg|400px]]
#: [[File:Saturn SPDIF Mod 3.jpg|400px]]
# Mount your external jack. This is one suggested location, but may require trimming of the case.
# Mount your external jack. This is one suggested location, but may require trimming of the case.

Revision as of 22:54, 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 with the Pep Audio PCB where extra ground can 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:
    • 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
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