How to connect an external microphone/synthesizer/guitar to the Android/iOS device?
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There are several ways to do it.
- Use Line 6 Mobile In (only for iOS).
- Use some external USB audio interface.
- Use headphone jack of your device (only 3.5mm TRRS compatible) with adapter (for instance, iRig, kVconnection, StarTech.com Headset Splitter Adapter etc).
- Build your own adapter for headphone jack (only 3.5mm TRRS compatible). The circuit diagram is below.
Note that the GND and the MIC pins may be swapped on some non-iOS devices with OMTP standard!