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Using Headphone Jack as Microphone: What You Need to Know ...
https://www.headphonesty.com/2020/09/use-headphone-jack-microphone/#:~:text=%E2%80%9CSystem%20Preferences%E2%80%9D%20with%20%E2%80%9CSound%E2%80%9D%20highlighted.%20In%20the%20%E2%80%98Sound%E2%80%99,and%20%E2%80%9CSelect%20a%20device%20for%20sound%20input%E2%80%9D%20highlighted.
Headphones not showing up in the input devices - Microsoft ...
https://answers.microsoft.com/en-us/windows/forum/all/headphones-not-showing-up-in-the-input-devices/723fe4af-d1d0-420f-89af-e10e9525aabe
Headphones not showing up in the input devices. Everytime I plug in my headphones the audio sounds fine but it does not record sound. I've tried using the same headphones with my phone and it works fine. When it does record sound its using the mic next to the camera because my headphones just does not show up in the input devices list.
Using Headphone Jack as Microphone: What You Need …
https://www.headphonesty.com/2020/09/use-headphone-jack-microphone/
Audio input via Headphone Jack - Audio - Arduino Forum
https://forum.arduino.cc/t/audio-input-via-headphone-jack/422126
Headphones are devices for pluging into outputs where as a microphone is a device for plugging into an input. You only need an op-amp on the input if your signal is low, like it is from a microphone. If you have a volt or two peak to peak there is no need to amplify. I know audio is AC while the analog is 0-5 VDC.
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