A radio earpiece basically depends on electromagnetism to convert electricity into sound and sound into electricity. This is the basic technology that helps us enjoy music or any sound through our ears. Another important technology involved is miniaturisation. Basically, this is how a clock becomes a watch. Applied to the concept of the radio earpiece, this is turning the loudspeaker which is a big box into a headset and finally into the tiny round pieces that you simply insert conveniently in your ears.
Honey, I Shrunk the Loudspeakers
Miniaturisation makes you wonder how something can be compressed into so small an object and yet still produce high-quality sound, in such a manner that you can hear a pin drop. While old school methodology used to accomplish everything by hand, nowadays, machines or robotics are used to mass produce the tiny bit. It is not only much too cumbersome for hands to do the job.
There is simply no economic gain to be had from faithfully reproducing a pair of earbuds from a hand trick, unless of course, one is producing an expensive watch that Swiss technology is known all over the world for. Broken down into tiny bits, every radio earpiece will have seven important parts with their own separate functions.
The Seven Little Parts that Make a Whole
The biggest part would be the back case which basically holds the two wires and all the tiny pieces together. Without the case, there would be nothing holding everything together and hence no sound will be produced. This case is basically the same as the big box of the loudspeaker. The only difference is the size. The huge loudspeaker needs to manipulate the air coming in and out of the box to produce sound. On the other hand, its tiny counterpart needs to work on the air in your ear canal in order to accomplish the same thing.
Of course, there has to be a tiny magnetic device, otherwise, the principle of electromagnetism will not work. The round front case with super tiny holes is what interfaces with your ear and transmits the sound accordingly. A tiny seal in the form of a ring is what holds the back case and the front case together.
Requirements of Electromagnetism
You might think that the two wires and the magnetic device would be sufficient to produce the electromagnetic principle, but something is missing from the equation. There has to be a separate, tiny coil that enables electricity and magnetism to fuse together and work. Take this out of the equation and the magic does not happen. Finally, a transparent plastic film is necessary to make the sound as it vibrates.
The Sound Machine that Looks Like a Protective Film
You might think that it just some kind of protection for the internal parts, but without it, sound does not happen. The transparent plastic is equivalent to the grooves in the mighty loudspeaker that lets the air in and out.
So there you have it, seven very tiny parts that comprise the radio earpiece, which, you will have to admit is a marvel of technology or technologies. Now that you know the inner workings of that radio earpiece that you just take for granted, perhaps you will never look at it the same way again.