Grouping: Pairs or individual
Take-home: Working paper speaker; reusable magnets/electronics returned
Key ideas: Electromagnetism, vibration, diaphragm, coil, sound.
Start with: Play sound through a working paper speaker and gently touch diaphragm to feel vibration.
Success check: Speaker produces audible tone/music; compare diaphragm/coil changes if time.
Try changing: Diaphragm size/stiffness; coil turns; coil-magnet gap.
Preparation: Wind sample coils; confirm safe low-power audio setup before class.
CNC preparation: Cut coil winding jigs or speaker frames.
3D-print preparation: Print coil formers/stands.
Lesson flow: Day 1: build
Day 2: troubleshoot/test variables
Video:
How to Build a Paper Speaker
Safety and cleanup: Low-voltage audio only; teacher checks circuits to avoid shorts/hot wire.
https://www.sciencebuddies.org/stem-activities/make-a-paper-speaker
https://www.youtube.com/watch?v=liSEwqdq7aA