So the prosound mod by Trash80 is a pretty fundamental for any gameboy modder. However if space is a big issue for your gameboy, this post may be helpful if you're trying to cut back on as much as possible. In this variation of the Trash90 prosound mod we will be modding a gameboy for the extra DB out of the 3.5mm stereo jack as you would normally but in the process the pcb connected to the 3.5mm output will be completely removed. The only disadvantage with this technique is that you sacrafice the ability to output to the gameboy internal speaker but this just means you can take out the speaker also for more room!
The following three pictures below show how the prosound mod is usually wired up.
In our variation we will firstly remove the audio output PCB from the gameboy by unscrewing the screws and chopping the 3 black and 1 white wires as shown above. Once the audio output PCB has been removed we will now desolder the 3.5mm headphone jack from the pcb and reattach the 3.5mm headphone jack back into position without the PCB as shown below. Finally, wire up the headphone jack as shown below such that it connects to the red and green wires post-pot pins on the PCB and the white wire goes to ground.
As an additional step, its probably helpful to remove the internal speaker also as that will no longer be of any use and this can be done simply by chopping the two speaker wires.
Hope this helps and happy modding :)
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