Instructions for building a low-priced (~$5) loudspeaker -- great physics project for schools
Original Research Paper (Acoustical Society of America)
American Association of Physics Teachers Presentation
- You'll need an amplifier to get much sound out (especially if demonstrating to an entire classroom). I used the LP-2020A+
- Watch out for abuse of hot glue
- If their lid is attached, they'll need to cut it off
- If the c clamps rattle, you can use some hot glue on them
- Make sure they leave plenty of extra wire on both ends of the coil
- I've used AWG 26 & AWG 13, and prefer 13 as it doesn't heat up after short use
- The speakers make pretty fantastic headphones - just need a little soldering + a coat hanger