Jump to content

PaperLand

Sign in to follow this  
  • entries
    30
  • comments
    9
  • views
    2,356

The Little Speaker That Could

Sign in to follow this  
PaperBoy

306 views

Nowadays, almost every kid has a computer, whether it's their own or not. And, with that computer, nearly every kid listens to some type of video, music, or even alert messages. Without sound, computers just wouldn't be as useful. But how do computers make sound?

The answer is quite complicated. Older computers used the common magnetic speaker, which included some array of copper wires and an iron magnet. The original design was a simple iron magnet inside a copper coil, vibrated by the electric field induced inside.

Nowadays almost all computers use piezoelectric speakers. This type of speaker is named after the piezoelectric effect, which describes the quality of certain materials to create an internal electric charge due to mechanical stress. A voltage is supplied to a resonator or diaphragm, which in turn begins to vibrate as the electricity causes stress in the object, reversing this effect. The sound of the speaker is controlled by a process called pulse-width modulation. This means that the power supplied to the speaker is digital, either 0V or 5V. However, by adjusting the duration of the duty cycle (the amount of time it gets 5V) different sounds can be created.

Lots of ingenuity went into those tiny little buzzers you listen to every day. So take some time and really enjoy them. Some robot is slaving away making them right now.

 

 

Sign in to follow this  


0 Comments


Recommended Comments

There are no comments to display.

Guest
Add a comment...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Terms of Use

The pages of APlusPhysics.com, Physics in Action podcasts, and other online media at this site are made available as a service to physics students, instructors, and others. Their use is encouraged and is free of charge. Teachers who wish to use materials either in a classroom demonstration format or as part of an interactive activity/lesson are granted permission (and encouraged) to do so. Linking to information on this site is allowed and encouraged, but content from APlusPhysics may not be made available elsewhere on the Internet without the author's written permission.

Copyright Notice

APlusPhysics.com, Silly Beagle Productions and Physics In Action materials are copyright protected and the author restricts their use to online usage through a live internet connection. Any downloading of files to other storage devices (hard drives, web servers, school servers, CDs, etc.) with the exception of Physics In Action podcast episodes is prohibited. The use of images, text and animations in other projects (including non-profit endeavors) is also prohibited. Requests for permission to use such material on other projects may be submitted in writing to info@aplusphysics.com. Licensing of the content of APlusPhysics.com for other uses may be considered in the future.

×
×
  • Create New...