How to make an electric stimulator with speaker wires

Written by rob billeaud
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How to make an electric stimulator with speaker wires
9-volt battery (nine volt battery image by JoLin from Fotolia.com)

An electrical stimulator can be useful in aiding understanding of the muscles in the human body. Such life-saving devices as the automatic electronic defibrillator (AED) operate on the principle of sending electronic impulses through a muscle--in this case, the human heart--to initiate movement. On a smaller, less grand scale, for science fair projects or hobbies, a simple electric stimulator can be constructed from speaker wire and a few other components readily available at a local hardware or electronics supply store.

Skill level:
Easy

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Things you need

  • Speaker wire
  • 9-volt battery
  • 9-volt battery snap connector
  • Wire stripper
  • Test probe leads
  • Electrical tape

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Instructions

  1. 1

    Split both ends of the speaker wire about 2 inches down each end so you have four separate ends.

  2. 2

    Strip approximately a half-inch of insulation from all four ends.

  3. 3

    Cut any connectors off the test probe leads.

  4. 4

    Strip a half-inch of insulation from the wires of the test probe leads.

  5. 5

    Strip a half-inch of insulation from the ends of the snap connector wires.

  6. 6

    Twist together the exposed ends of the test probe leads and the exposed ends of the speaker wires on one end and secure with electrical tape.

  7. 7

    Twist together the exposed ends of the snap connector wires and the exposed ends of the speaker wires on the other end and secure with electrical tape.

  8. 8

    Snap a 9-volt battery into the snap connector and test the stimulator by touching the ends of the probes together. You should see a small spark. If you do not see a spark, check all connections and retest the stimulator.

Tips and warnings

  • This stimulator is an inexpensive device for demonstrating the effect of electrical stimulation on the leg muscles of dissected frogs in high school biology classes.

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