- 3 feet of magnet wire
- Small rare-earth magnet
- 1 Post-It note
- Audio cable
- 2 alligator clip wires
Sand the coating off both ends of the magnet wire, starting about 2 inches from each end.
Wind the magnet wire around your finger to form a neat coil. Leave about 3 inches on each end. Then slide it off, and secure the coil with tape.
Tape the rare-earth magnet to a flat surface, like a tabletop.
Attach the sticky note next to it, so that it forms a flap over the rare-earth magnet.
Tape the coiled wire in the middle of the sticky note.
Cut one of the ends off the audio cable. (Make sure the remaining end is the male plug.) Peel back the outer rubber to expose the two inner wires.
Attach each exposed wire to one end of the coiled wire with the alligator clips.
Plug the audio cable into your cell phone's audio port, and play some music. Hold your ear over the coil to hear shockingly crisp sound.