Please review information in the GitHub repo!!

This is the HDP (headphone) board (one of four PCBs) for my design for an original Game Boy (model name DMG) with native Game Boy Color support, and a handful of improved features! This is an original creation - newly designed PCBs, with only some necessary components harvested from an original Game Boy and Game Boy Color (no hardware emulation – this project uses the original CPU). Here are the project goals:

1. An original Game Boy aesthetic, using the original Game Boy shell and interface (link port, volume wheel, power switch, etc.), but with the capability of playing both Game Boy and Game Boy Color games.
2. A nice, large IPS screen – the GBC Q5 XL IPS Backlight with OSD kit – with brightness and color palette control via the "navigation switch" housed where the contrast wheel used to be. (I will refer to the PCB attached to the Q5 screen as the “Q5 board”)
3. A modernized, efficient switch mode power supply that can run off 4x AA batteries or input from the DC jack, just like the original DMG. Testing shows that playing with NiMH AA batteries can yield more than 18 hours of gameplay at normal settings (AKA, the way I normally play it - maximum brightness and headphones).
4. Louder, warmer sound through a modern audio amplifier.
5. The option for backlit buttons, with multiple color modes and brightness control.
6. No externally viewable case modifications, outside of trimming the DMG power switch cover for Game Boy Color game compatibility.

The code name for this project is DMGC. This console uses four PCBs, just as the original DMG model did - a CPU board (DMGC-CPU), display board (DMGC-IPS), power board (DMGC-PWR), and headphone board (DMGC-HDP). All circuit board assemblies have their own separate folders in my GitHub repo, which contain detailed descriptions of operation, source files for schematics and board layouts (designed using Eagle), exported Gerber files, and some other relevant files.

https://github.com/MouseBiteLabs/Game-Boy-DMG-Color

Note: This project includes four PCBs:

https://www.pcbway.com/project/shareproject/Game_Boy_DMG_Color_DMGC_CPU_01_2f5c743d.html

https://www.pcbway.com/project/shareproject/Game_Boy_DMG_Color_DMGC_IPS_01_82a454c9.html

https://www.pcbway.com/project/shareproject/Game_Boy_DMG_Color_DMGC_PWR_01_f8f2e84a.html

https://www.pcbway.com/project/shareproject/Game_Boy_DMG_Color_DMGC_HDP_01_bdacd78d.html