For 3.5mm headphone jack, use the following.
The terminals below are for the tip, ring 1, ring 2 and sleeve structure.
Two terminals are located on Ring 2, so it can be used regardless of 3-pole or 4-pole.
![](https://cdn.hackaday.io/images/4816121593331716129.png)
![](https://cdn.hackaday.io/images/6052111593331716147.jpg)
![](https://cdn.hackaday.io/images/8882131593331716720.jpg)
For the GBA SP bottom shell, just make the space between the battery terminal and the battery latch as above.
![](https://cdn.hackaday.io/images/3387091593331751343.jpg)
![](https://cdn.hackaday.io/images/7386081593331751398.jpg)
![](https://cdn.hackaday.io/images/9430211593331751320.jpg)
![](https://cdn.hackaday.io/images/797521593331751325.jpg)
![](https://cdn.hackaday.io/images/1751501593331751545.jpg)
![](https://cdn.hackaday.io/images/4941831593331751945.jpg)
![](https://cdn.hackaday.io/images/2894551615970921270.jpg)
Great work, I appreciate your efforts for the all work and images you shared.
Regards,
My Boy APK