This one is using a simple PBC from TinkerBOY, for a simple PCB it is pretty awesome, it has traces for 5v/gnd, and audio in/out so you do not need a power strip and you can run your audio wires through the board
All controls are done through the GPIO, and I have used pwm mono audio, using a low pass filter and a small 20mm speaker. I skipped the volume wheel, and just have in game volume hotkey for volume. For PWM audio, the sound is pretty decent.
I also used the banggood power boost located in the cartridge, and a 4000Mah batter that fits perfectly in the battery compartment.
The nice stickers are compliments of YaYa, and they look awesome!
The L and R are 12mm tactile buttons I made the mounts out of some perf board, it's working good! Screen cover from HHL, and buttons from aliexpress.
I'm very happy with how this turned out, I was a little skeptical about the clear case and how it would look, but I think it turned out awesome!
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