2 layers67.9 × 38.8 mm

DT770 Bluetooth Mod
farbefreak/DT770-BT-Mod
Hardware + Modding guide to add Bluetooth to DT 770 Headphones
38 parts15
KiCad boards from 2 GitHub repositories tagged “mods”, the most starred first; open any of them in PCBKit.

farbefreak/DT770-BT-Mod
Hardware + Modding guide to add Bluetooth to DT 770 Headphones

eldstal/touchless-xm
Physical buttons for media control on the Sony WH-1000XM2, WH-1000XM3, WH-1000XM4 and possibly WH-1000XM5 wireless headphones