They probably won’t please the audiophiles, but [KJMagnetics] shows you that can create a pair of speakers with some magnets, some plastic cups, and a bit of magnet wire. Creating speakers out of junk isn’t a new idea, of course. However, there’s something pleasant about the build. Maybe it is the symmetry of the cups or the workbench look of the woodworking.
We couldn’t help but think that this would make a good science fair project or a classroom activity. Especially since there is a good write up on how speakers work and it would be easy to make simple changes to test different hypothesis about speakers. For example, what happens with more or less wire in the coils? What magnets work best? What does best even mean? Is it louder? Less distortion?
There’s a video (below) of the speakers in action if you want to hear what they sound like. We couldn’t help but start sketching really geeky looking headphones. However, if beer pong cups are too ordinary for you, you might prefer making a speaker out of a hard drive. Or if you want something using off the shelf speakers, we thought these would make a good rainy day project.