Nintendo 64 USB-C PD mod with ZY12PDN

This model allows you to install a ZY12PDN USB-C Power Delivery module inside a Nintendo 64 power supply case. The PCB snaps into this case and whole assembly can take place of the original AC cable. Print using transparent filament to see the PD module's status LED through the built in light pipe. Place the model “sideways” on the bed for better strength, see PrusaSlicer screenshot (printing it USB-side-down makes it more fragile.)

To complete the mod, I set the module up to deliver 15V (20V will also work). That is converted down to 12V and 3.3V with 2x DC-DC converters. I used some generic adjustable modules I found that could deliver the required current. You will also need to widen the original opening to fit the PCB and holder assembly. Depending on how large your DC converter modules are you also may have to snip some elements that may get in the way. I would also recommend measuring out the cable lengths before soldering things down, if I were building this again - mine turned out a bit too long as you can see in the photo. 

(Update 27. Oct 2026) as pointed out by others - If you have a power source that supports 12V output (PD profile or PPS like modern IKEA chargers) that also can be used directly for 12V rail, with a single converter for 3.3V rail. For mine I used 15V, because some PSUs I have at home do not support 12V, such as Apple charger.

Map out the pins on the original DC power socket using a multimeter in continuity mode and compare with the pinout on the case. Verify the voltages before plugging it into the console :)

I do not recommend using the 12V output mode on ZY12PDN and a single DC converter, since newer chargers do not support the 12V profile anymore. I don't know if N64 will tolerate 15V directly on the 12V input, and I do not plan to test :D

While designing, I used a 3D model of the PD board by glowingkitty https://grabcad.com/library/usb-c-pd-board-zy12pdn-1 -  big thanks!