Do it yourself: speaker made of neodymium magnet
The speaker uses the interaction between an alternating magnetic field generated by a wire coil and a constant magnetic field created by a neodymium magnet.
- a large cylindrical neodymium magnet; - 2 meters of copper wire with a cross section of 0.5 mm; - disposable plastic plate; - four business cards (you can use playing cards); - two cables with crocodile clips.
You will also need pliers, a glue gun and, in fact, an amplifier or stereo system to which you plan to connect your speaker.
Step 1. Making a paper cylinder 2 cm high
Step 2. Connect the cylinder and the plate
Step 3. Connect the speaker to the audio system
Step 4. We make two coasters from cards or business cards
More information about the speaker can be found in the video.