Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.
Step 1: Materials
2. Two plastic Cups
3. 3.5 mm Aux Stereo Jack Plug
4. 3 Ft. 28 AWG Wire
5. 8 Neodymium Magnets
6. Glue Stick
7. Sand paper
Step 2: Assembly, Sanding + Coiling
Now that you have all your materials you can get started! Start by the 3 ft of 28 AWG Wire and the glue stick. Start wrapping the wire around the glue stick and make sure that it is nicely and tight together. Do about 36 wraps to have a strong connection. Now when removing the perfectly coil that you just made, remove the glue cap so that it can be easily to remove. Now that you have removed your voice coil from the glue stick you want to tape it but don’t compress the coil together. Cut two small pieces of tape like REALLY SMALL and wrap them around the coil so that it stays secure. Now grab that sandpaper and start sanding down both ends of the wire. You want to repeat this step because you have two cups, one for each ear.
The number of coils my partner and I decided to go with was 36 because the more wraps,the stronger the connection will be with the terminal. At first we only did 25 wraps of coil, but then realized that the sound wasn’t strong enough so we decided to go for 12 more wraps of coil, and came to be a total of 37 wraps of coil which in fact made a difference in the sound. With our first coil it wasn’t much of a coil but compressed together. With the coil being compressed we realized that the sound wasn't loud enough. The second coil we made was less compressed together and it sounded much clearer than before and that is with the 37 wraps. The more coil the stronger and higher quality the music will sound. This happens because there is a strong magnetic field that makes the coil stronger and will help the voice coil vibrate even more, which will produce a high quality music. The voice coil also helps provide a temporary magnetic field that helps attract and repel from the permanent magnetic field that comes from the neodymium magnets that is inside and outside of the diaphragm(cup).The number of coils relates to the right hand rule because the electromagnet current runs through the wire that is wrapped around the wire that is shaped as the coil which represents the curve of your hand and the direction the axis of the coil is going.
Step 3: Magnet Positioning & Diaphragm Assembly
The permanent magnet is needed in the center because without the magnets the speaker won’t work. Scientifically talking, the permanent magnet is needed because there is alternating current that flows and it interacts with the magnet. Therefore the alternating current is constantly reversing the magnetic field between the voice coil and permanent magnet and this touches. the voice coil to move back and forth.
Step 4: Plug & Play
The reason you would sand the end of each red wire is because you’re getting the enamel off the copper. When the enamel is off the wires can touch and the current can continue through to the other wires completing the circuit. Sound waves is produced when something is vibrating. For example, when we played music we could feel the vibration coming off from the magnet.
Step 5: Troubleshooting
If you can’t hear music try to move the wire that is connected to the aux plug. Make sure the two wires are not touching each other.
Make sure you have magnets to the bottom of the cup and inside the cup.