Electromechanical Transducer Out of a Polystyrene Conical Section!

Step 7 Coil to the Cup

Use something pointy, such as a paper clip, to poke a small hole near the base of the cup. Set your coil in the cup and slide the wire tails through the hole.

Squeeze the super glue into a small circle in the center of the cup. Press the coil onto the glue and hold for ten seconds.

Split your magnets into two groups. Hold one group against the outside of the cup right under the center of the coil. Toss the second group in the cup so they attach in the center of the coil to the magnets on the outside.

Comments

[cyberpageman]

There is a design problem with this plastic cup speaker. The magnetic field from the coil has to move the heavy mass of the permanent magnets to produce sound. The magnets shouldn't be touching the plastic cup. Check out http://www.instructables.com/id/Homemade-speaker/ which shows how that can be done.

[steadmanjon]

This actually worked. I used an empty peanut can and some alligator clips. The sound was very weak, but I could hear it.

[chriskarr]

Well... ...the whole superglue in a plastic cup thing worries me. If the cup is made of the wrong kind of plastic, the super glue will dissolve it. Please test the cup first!