Technically, one should not give more than 3V/3.3V (according to the Android Documentation) between the ground and the left/right/mic pin of the headphone jack. But there is this innate curiosity to know what would happen if one was crazy enough to do so.
We request you to not try this at home since doing this can damage your sound card! But nevertheless here is what would happen:
One thought on “Don’t do this! – Headphone jack”
Pingback: Do not connect a speaker directly to a headphone jack (Speaker Impedance) | The hacker Diary