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Android device external mic wiring - ePanorama.net | Audio
https://www.epanorama.net/blog/2014/09/15/android-device-external-mic-wiring/#:~:text=The%20input%20impedance%20is%20increased%20from%20around%202,the%20safe%20overload%20range%20is%20equal%20or%20higher.
What is the voltage range of a standard headphone jack ...
https://electronics.stackexchange.com/questions/28404/what-is-the-voltage-range-of-a-standard-headphone-jack-from-a-phone
The most common nominal level for consumer audio equipment is −10 dBV, ... Expressed in absolute terms, a signal at −10 dBV is equivalent to a sine wave signal with a peak amplitude of approximately 0.447 volts, or any general signal at 0.316 volts root mean square (VRMS). ...
Help choosing audio jack and iphone audio voltage range ...
https://forum.arduino.cc/t/help-choosing-audio-jack-and-iphone-audio-voltage-range/652652
The top answer in this arduino - What is the voltage range of a standard headphone jack from a phone? - Electrical Engineering Stack Exchange stack exchange says that it has a 2.2v peak, which means that after offsetting the output will result in a 4.4v max.
Headphone jack voltage range? - Audio - Arduino Forum
https://forum.arduino.cc/t/headphone-jack-voltage-range/628834
About 1V RMS with the volume cranked-up. Of course it varies a lot. Some headphone outputs/amplifiers are capable of more voltage than others, some songs/programs are louder than others, and there is a volume control. The DAC can't read negative voltage so I'll need to use an op amp to amplify the whole audio signal so it's above 0V.
headphones - Understanding voltage levels on 3.5 mm audio ...
https://electronics.stackexchange.com/questions/298573/understanding-voltage-levels-on-3-5-mm-audio-output
When no audio is playing, there's a voltage of about 2 mV. When I output a constant audio signal, the voltage rises initially to 0.5 V, but drops back to 2 mV after 2-3 seconds. What purpose does this 2 mV bias voltage serve?
Audio Levels - A Beginner's Guide - Cable Chick Blog
https://www.cablechick.com.au/blog/audio-levels-a-beginners-guide/
Mic Level is measured in millivolts, and usually comes in around the 1mV to 100mV range, depending largely on whether you're speaking at a wedding or screaming at a rock concert. As you can imagine, this isn't a whole lot of power, and so microphones need to be fed into Pre-Amps or Amplifiers with special Microphone inputs which boost it up to another Audio Level.
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