Neodymium Magnet Loudspeaker

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Introduction: Neodymium Magnet Loudspeaker

About: I am robotics engineer and a teacher whose passion in life is breaking down the maths and academic jargon of programming and robotics into something that everyone can understand, primary school kids include...

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

Teacher Notes

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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:

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    9 Discussions

    0
    kiwi439
    kiwi439

    4 years ago

    how big is a 'large' magnet? what size should i use?

    0
    hosseini1_61
    hosseini1_61

    4 years ago

    I'm goona make this?

    0
    Robotix_au
    Robotix_au

    Reply 4 years ago on Introduction

    You should! its really easy, except for the fact that you need a special magnet

    0
    aseelb95
    aseelb95

    Reply 4 years ago on Introduction

    What kind of magnet would you need? What do you mean by special?

    0
    tortiz-potter
    tortiz-potter

    4 years ago

    where is the link to the video?

    0
    trgwan_2006
    trgwan_2006

    4 years ago

    hey xan you put link to the video pls . thanks for sharing . sure following u .

    0
    Robotix_au
    Robotix_au

    Reply 4 years ago on Introduction

    HTML link added in the intro and another link at the end :).. cheers