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I measured the resistance between the sleeve and ring 2 on my Bose QC25 headphones: 5.6 kΩ This led me to adding a 5.5 kΩ resistor to my plug, and it works: Notes: Rings 3 and 4 are intentionally left unconnected. I don’t need headphone output. With another headset that I tried, the phone, a Xiaomi 4X, did not detect it properly. That headset did work on ...

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