GC Dual Construction Log

The Journey Begins

I intend to build some GCDual kits to install for a few local folks. As I haven’t really done anything on this scale before, this will be a learning process, and I want to log my progress here in case anyone else wants to try.

All of this is possible thanks to the amazing work of citrus3000psi for the boards and Unseen for gcvideo. All of the information on this page is compiled from citrus3000psi’s oshpark page, his website, the gcvideo thread on shmups, and the gcvideo github. I’ll add sources here as I go.

Needed Tools

Straight off of Dan’s install instructions:

  • Temperature Controlled Soldering Iron
  • Flux
  • Extra Fine Soldering Tip
  • Solder Wick
  • 99% Isopropyl Alcohol
  • Side Cutters
  • Drill Bit
  • Drill
  • Sharpie
  • Small Square File
  • Small Flat File
  • Metal Cutting Tool, i.e. Dremel


Ordering Boards/Parts

The kit consists of three boards: the Hookup board that solders on to the digital port and multiout pins, the main board that holds the FPGA, and the HDMI extension board that is connected by an FFC cable and sits above the digital port.

I ordered my parts from Digikey. I’m normally a Mouser guy, but the FPGA is only on Digikey and I’m not paying for shipping twice.

Hookup Board

Version 1

TVS Diode: ESD5Z5.0T1G

Main Board

Version 5.3

JP1 – Short for onboard flashing.

JP2 Open – Non Attenuated CSYNC

JP2 Closed – 75Ohm Attenuated CSYNC

Reference Value Notes
C1, C2, C4, C5, C7, C9, C10, C12, C15, C16, C17, C18, C20 .1u 0603 50V
C3, C8 10u 0603 10V
C6 4.7u 0603 10V
C13 .01u 0603 50V
C21 1u 0603 50V
D1 LED 0603
D2 AD1580BKSZ-REEL7 SOT-23-3
R1 250 0603
R2, R10 4.7K 0603
R3 100 0603
R4, R5 75 0603
R7 384 0603 1%
R8, R13, R14 10K 0603
R9 180 0603
R11, R16 330 0603
R12, R15 1K 0603
U1 XC3S200A 100-VQFP
U2 ADV7125 48-LQFP  50Mhz
U4 TLV70212DBVR SOT-23-5
CON1 2-1734592-0 20 PIN FFC .5mm

HDMI Extension

Version 1

HDMI connector | 2013978-1

FCC Connector | 2-1734742-0

TVS Diodes | TPD4S009DGSR

There is also an alternative board for use with mini-hdmi connectors from aliexpress that come in 10 packs and are roughly 10 times cheaper.

Board for Aliexpress Mini HDMI

Mini HDMI Port via Aliexpress

Other Parts

FFC Cable (connects HDMI extension to the main board)

#3-56 Nut (connects to the original heatsink screw and provides a base for the mainboard)

M2 screw, M2 washer, M2 nut (for attaching the HDMI extension board to the Gamecube)


30 AWG Wire (for controller input)

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