Android

Headset plug schematic

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ReqN = 
 Rmic * Rn 
 Rmic + Rn 
Rn = 
 Rmic * ReqN 
 Rmic - ReqN 

MicΩ
R1 Ω [Function A] Play/Pause/Hook
R2 Ω [Function B]
R3 Ω [Function C]
R4 Ω [Function D]
Source: 3.5 mm Headset: Accessory Specification
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