← All projectsBuild 001 / Electromagnetism
Paper → sound.
Follow the moving parts from an electrical audio signal to a vibrating paper cone.
Download the diagram ↓
Gather the parts
Cardstock conePaper tubeInsulated copper magnet wireFixed magnet + baseFlexible paper supportsGlueCompatible powered audio driver
How it comes together
- Make the moving coil. Wind insulated wire around a paper tube and keep both connection ends accessible.
- Attach the cone. Secure the tube to the cone so that they move as one assembly.
- Support it without jamming it. Fix the magnet to the base. Use flexible supports to center the coil around the magnet with enough clearance to move.
- Make the electrical connections. Remove enamel only at the two wire tips. Choose a powered audio driver suitable for the measured coil load, then check the connections and freedom of motion.
Why it makes sound
The audio current changes with the signal. In the magnet’s field, it creates a changing force on the coil. The attached cone vibrates and moves the surrounding air.
If there is no sound
Check that the wire tips are electrically bare, the connections are secure, and the coil can move without rubbing. Stop if components become hot.
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