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Sound Reproduction (Page 1 of 2 )  


First we build a coil on the end of the plastic cup which will be used to convert audio signal into electromagnetic waves

Materials / Part 2 / Main Page



Step 1:

  • Cut a 1/4" length off of the soda straw. Use a hot glue gun to attach it to the bottom of one of the plastic cups.

    Note: Before attaching the soda straw, make certain that the small magnet will move freely inside the piece of soda straw.



Step 2:

  • Wind 100 turns of #33 enamel-coated copper wire onto the soda straw that is attached to the cup. (The number of turns can vary from 50 to 150 turns. 100 is optimal).


Electronics Experiment Step 2


Step 3:

  • Burn and sand off the enamel from the coil wire ends.
  • Strip off about 1/2" of insulation from two telephone wire leads.
  • Twist and solder the coil wires to the telephone wire ends.
  • Use the hot glue to attach the telephone wires to the side of the cup.

Electronics Experiment Step 3

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