LOUDSPEAKER ---- FUNCTION OF A MAGNET IN A SPEAKER
There is something that amazes me which i will love to share with you guys today.
Have anyone wondered how a speaker works?
Where does the sound comes from?
When you open the box all you see is a magnet, isn't it interesting??
Today i'm going to share my taught and then i will love to hear from you your ideas.
First of all let me say this, "not all speakers uses magnet"
I know to some people it might sound weird, but that is the truth.
Inside a speaker there is a metal coil that creates a magnetic field when an electric current flows through it.
There are two kinds of magnet inside a speaker, which is the permanent magnet and the electromagnet, the electromagnet is always placed in front before the permanent( always placed in front of the permanent magnet).
The electromagnet is mobile while the permanent magnet is usually fixed firmly in a position.
The direction of the magnetic field of the electromagnet is rapidly changed when pulse of electricity passes through the coil(electromagnet coil), this process causes a repel from the permanent magnet vibrating back and forth.
The electromagnet is always attached to a conical material such as plastic or paper which aids in the amplifying of vibrations and pumping of sound waves into the surrounding and the human ears.
What governs the pitch of the sound produced is the frequency of the vibrations and their amplitude affects the volume,(when you turn high)enough, you might see the diaphragm covering the cone.
Speakers plays loud when the cone vibrates a large amount and plays low or soft when it moves a small amount.
Just like drums, banging on it hardly makes the skin vibrates in a greater distances which produces a louder sound than banging it softly.
In order to reproduce different frequencies of sound in a piece of music, all top quality speakers typically uses a different sized cones, dedicated to high medium and low frequencies.
Remember one of the laws of physics that says " we can't make energy out of the air",
So therefore the bigger the pulse sent into the speaker through electricity the louder the sound.
PARTS OF SPEAKER AND THEIR FUNCTIONS
| S/N | PARTS | FUNCTIONS |
|---|---|---|
| 1 | Diaphragm | it moves in and out in order to push the air to produce sound |
| 2 | Basket | this is the frame work around which the speaker is built |
| 3 | Dust cap or dome | this help in preventing dust and dirt from entering the voice coil |
| 4 | Suspension or spider | these are usually flexible corrugated support that holds the voice coil in place, while allowing it to move freely |
| 5 | Surround | this is a piece of elastic rubber, textile or foam that flexibly helps in fastening the diaphragm to the basket which is the outer frame |
| 6 | Cables | this is for the connecting of stereo amplifier unit to the voice coil |
| 7 | Former | this is a cylindrical cardboard or any other material in which the coil is wound |
| 8 | Pole piece | this is what concentrates the magnetic field produced by the voice coil |
| 9 | Top plate | it is made of soft iron |
| 10 | Bottom plate | it is made of soft iron |
| 11 | Magnet | this is a material typically made from a powerful neodymium or ferrite |
| 12 | Voice coil | it is a coil, it is what makes the diaphragm to move back and forth |
A microphone uses same mechanism as speakers in a reverse manner to convert sound to an electrical signal.
N|B: pair of headphones can be use as microphaone.
REFERENCES
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Nice! Now I know how sound is generated in a speaker..I always thought all of them have magnet tho
I thought as well too, until I discovered