The Project
The goal of my project was to make a functional pair of headphones.
The headphones were made of paper cardboard and spare wire both 22gage and 34 gage
The physics of sound
Sound is caused when an object vibrates at varying speeds to produce different sounds
The speed of the vibrations determines the pitch of the sound
Basic concept
Headphones are actually an example of a machine called a solenoid
This machine simply moves back and forth
How my headphones work
Music is recorded as a signal consisting of on and off electric signals
When your phone turns the electricity in its audio jack on, the electricity causes the spool of wire to act like a magnet. As a result, the spool of wire and the permanent magnet attract and repel each other.The permanent magnet is attached to the spool. When your phone turns the audio jack off, the spools of wire stops acting like a magnet and when the electricity in the phone audio jack is off, the permanent magnet is pulled back to its original position by the diaphragm. As the electricity turns on and off, the diaphragm vibrates.This vibration produces the sound.
Performance
The sound of prototype #1 was a successful. On the left one it doesn’t work, but the right one is really loud.
YanPing Liu 