Introduction: Neodymium Magnet Loudspeaker
To get a good idea of the physics behind the functioning of a loudspeaker watch the video above.
youtube link here:
https://www.youtube.com/watch?v=B7p2FuJkzkc
In short, the loudspeaker uses the interaction between the temporary magnetism generated in a coil of current carrying wire and the permanent magnetism generated by a stationary neodymium magnet.
Components:
1 Large cilindrical neodymium magnet
2 meters 0.5mm copper wire
1 plastic plate
4 business cards / playing cards
2 Aligator cables
Tools:
Wire cutters
Hot glue gun
Stereo system OR phone + sound amplifier
Step 1: Create a 2cm High Paper Cylinder
Cut a 2 cm strip along the long side of an A4 page.
Paste some paper glue along this strip.
Wind the strip up to a width just wider than your magnet.
Secure the strip with some electrical tape.
Step 2: Connect the Cylinder and a Plastic Plate With Hot Glue
Wrap up the paper cylinder with 2m of 0.5mm copper wire.
Make sure the cylinder is centered
Allow 5 minutes or more for the hot glue to dry
Use a lighter or some sand paper to strip the ends of the copper wire
Step 3: Connect Speaker to Stereo Output and Test With Magnet
Speaker should work with both polarities, one of which may work better.
If the speaker works use some blue tac to secure the magnet to the table.
Step 4: Create Some Paper Springs With Business Cards
Adjust until the speaker works well.
See it in action in this video starting around the 9 minute mark:
9 Comments
5 years ago
how big is a 'large' magnet? what size should i use?
5 years ago
I'm goona make this?
Reply 5 years ago on Introduction
You should! its really easy, except for the fact that you need a special magnet
Reply 5 years ago on Introduction
What kind of magnet would you need? What do you mean by special?
5 years ago
where is the link to the video?
Reply 5 years ago on Introduction
I added the links, see comment above
5 years ago
hey xan you put link to the video pls . thanks for sharing . sure following u .
Reply 5 years ago on Introduction
HTML link added in the intro and another link at the end :).. cheers
5 years ago on Introduction
Very cool! Thanks for sharing this.