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Line level - Wikipedia
https://en.wikipedia.org/wiki/Line_level#:~:text=The%20voltage%20can%20reach%202%20volts%20peak-to-peak%20with,corresponds%20to%20the%20conventional%20range%20of%20human%20hearing.
Sound card input voltage range? | diyAudio
https://www.diyaudio.com/community/threads/sound-card-input-voltage-range.162610/
So better check it carefully. Stick to 0.5 Vrms or less into the 'line in' input. Don't use it if it's only mic input ! Most laptop users use an external sound card ( USB audio ) like the M-Audio Transit for measurement/recording purposes. Even that has limited input I think. Might be 0.775 V or so. Check it ! •••
How to Identify the input voltage range of PC Soundcard ...
https://www.edaboard.com/threads/how-to-identify-the-input-voltage-range-of-pc-soundcard.129939/
sound card voltage input That's right, the sample rate of most sound cards goes up to only 48 ksps. A 38.4 kbps signal would look badly jittery. Some fancier sound cards go up to 96 ksps or even 192 ksps. The waveform would look better, but still jittery. Also remember that most sound cards are AC coupled.
Current levels of headphone output and PC mic input | All ...
https://forum.allaboutcircuits.com/threads/current-levels-of-headphone-output-and-pc-mic-input.176098/
Maybe that is what the computer senses to activate the mic input. I recommended adding a 3900 ohms resistor to ground at the mic input to draw 0.4mA DC so the pc senses "a mic". You wrongly show a DC voltage of 1V from your headphones output but it is probably a 1V peak audio signal which is not DC.
PC microphone in voltage - Tom's Guide Forum
https://forums.tomsguide.com/threads/pc-microphone-in-voltage.239703/
Mic inputs expect something closer to 0.01V (10mV). Even the "line-level" inputs are designed for something less than 1V. Note that there are products designed for computers that are A/D converters...
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