I understand wireless headphones/earbuds. But the wired ones is a massive mystery. When they’re plugged in, how do they produce sound? (Sorry for English, I’m not a native Speaker.)
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They are much simpler and exclude several components that are present in wireless units: the radio transmitter, reveceiver, the microprocessor and the battery. In your playback the device is a small amplifier. It pushes electricity between a pair of wires in the headphone cable. This changing electric field causes a metal spiral to move closer to or retract from a magnet. A membrane is attached to this spiral and it sets air in motion.
In wireless headphones the amplifier and a battery for it are in the portable unit. It receives a digital signal over radio and decodes it to electric vibrations.
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