wire coiling
start winding the magnet wire around the coil former, leaving about 1 cm of space between the coil and the edge of the former. do about 50 turns, keeping them even and close together.
speaker
some magnets, wire and household loot. watch out jbl!
build instructions
cut
cut the wire while leaving another 2 inches free at the end. apply glue to the coil or otherwise secure the winding so that it cannot uncoil.
super dangerous step beware
with adult supervision, burn the insulation off the two free ends of the wire using a lighter. make sure enough enamel has been removed to expose clean copper so that the wire can make an electrical connection. alternatively, gently scrape it off.
non dangerous step
using a thin layer of tape, attach the finished coil to the bottom of the 3d-printed cup diaphragm. make sure the coil is centered and aligned.
ooh magnets
take a stack of your disc magnets and place it into the 3d-printed frame.
wire it up
connect the two free ends of the magnet wire to the red and black wires of your headphone jack using alligator clips.
test it out
plug the jack into a computer or other compatible audio source. start playing audio!
errors and troubleshooting
if the speaker does not produce sound, check that the enamel has been completely removed from the coil ends, that the alligator clips are making contact, that the correct wires from the headphone jack are being used, and that the coil is not mechanically blocked from moving around the magnets.
go beyond!
try soldering the copper wires and headphone jack, because it looks cooler. for louder sound, connect the pam-8403 amplifier to the speaker (you may need to adjust the number of wire turns).
your task
answer a quick question about why the wires in a speaker are in a coil shape.