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it is not the amplitude (volume level) that is the problem, but the basic nature of audio signals. Pins on a microcontroller are designed to work between 0 and 5 volts. the audio signal you are seeing at 250 on the ADC means that the pin is being exposed to -1.25 to 1.25 or greater when there are spikes like drum beats and such. the pins on a microcontroller are NOT designed to EVER see negative voltages, and it can cause irreparable damage to the chip. a headphone jack is more than capable of providing enough power to blow a pin, I've done it accidentally more than once.
How to Make the Metal Melter
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