resistors - Line level to microphone level to record - Electrical Engineering Stack Exchange

impedance - Circuit to Convert Line Level to Mic Level - Electrical Engineering Stack Exchange

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Difference between MC1023 and MC1024: Some devices have two audio outputs -- one for AUX output and another for MIC output, then you can use MC1023.

Nobsound MC1024 2-Way Microphone Headset/Speaker MIC Audio Switch Hub Switcher 3.5mm 4-Pole MIC A&B Selector

audio - Balance Mic and Speaker for Camera Input with Ground Loop Isolation - Electrical Engineering Stack Exchange

Nobsound MC1024 2-Way Microphone Headset/Speaker MIC Audio Switch Hub Switcher 3.5mm 4-Pole MIC A&B Selector : Electronics

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