In an earphone jack, the positive wire typically carries the audio signal to the speaker drivers, while the negative wire serves as the ground return path. The positive wire is usually connected to the tip or the first ring of the jack, depending on whether it’s a mono or stereo connection, whereas the negative wire is connected to the sleeve or the second ring. Proper connection ensures clear sound quality, while incorrect wiring can result in poor audio performance or no sound at all.
red positive, black negative
Earphones might still work if the earphone jack was damaged or wet for an iPhone. It's likely that they are damaged though.
as long as they have a 3.5 mm audio jack, yes
Yes, the GBA TV turner has earphone/speaker out jack.
could be a dirty or defective earphone jack. sometimes when you plug it in, it will mute your phone.
It's an optical sensor. When the headphones are removed iTunes will pause and the set volume will change.
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If your amp has a "line out" jack (most likely on the back of amp), you can run a patch cord from the line out jack to an input jack on your mixing board. An earphone jack will work also, but not quite as well, as that is not what it was specifically designed for.
The iPad has a standard 3.5-mm stereo headphone jack and will work with most brands of earphones.
It is possible that you might need to solder wires in your guitar jack. You could find the wiring diagram online.
Not into the PlayStation 3 itself, but pretty much all TVs or sound systems would provide a jack for earphones to be plugged in.
The manual for the LG800G shows describes a "handsfree or stereo earphone connector." It requires a (larger than some) 3.5mm male plug.