Unless you add a measurement instrument to your computer, you have only the sound card as an analog I/O port. You can use the sound card to digitize AC analog voltages but only within a limited range.

If these were the early 2000s. We would have said that having a sound card is a flex. With good reason, too. You'd slap one into your PC, crank up a media player, and pretend you were mastering audio.

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