How to Build a Spy Microphone


For as long as there have been countries, there have been spies. Spies report classified information while avoiding detection. Soon after the microphone was invented, it was used to capture conversations that were intended to be private. Speakers and dynamic microphones work similarly, so a small speaker can work as a microphone if a microphone is not accessible. During the Cold War, the United States and the Soviet Union regularly engaged in espionage, often using hidden microphones, or "bugs".

Things You'll Need

  • Speaker wire
  • Solder
  • Soldering iron
  • 1/8-inch mono male connector
  • Recording device
  • Speaker
  • Look behind your speaker. You will see two contacts. These are what you will connect your wires to.

  • Cut a length of wire. This should be long enough to run at least the length of the room you wish to bug.

  • Strip some protective rubber coating from each of your wires. You will strip four tips altogether. Remove about 1/4-inch of coating. This should give you just enough wire to solder with.

  • Plug in your soldering iron. Let it heat up for at least 10 minutes before use.

  • Melt some solder on the tip of your soldering iron and touch it to a contact behind your speaker. It doesn't matter which. Insert one wire into the solder and remove your iron to complete the connection.

  • Solder the remaining prong with your remaining water.

  • Hide your speaker and run the wire out of the room. You will want to make sure that the speaker and wire can't be seen.

  • Unscrew the body of your 1/8-inch male audio connector. This will reveal two contacts. You will connect the two remaining wires to these.

  • Slide the body of your 1/4-inch cable over your wire. This will allow you to reseal your connector after soldering.

  • Solder both wires to a prong. It doesn't matter what order.

  • Screw the body back on your connector and plug it into your recording device. Begin recording. You should hear words spoken in a room.

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  • Photo Credit Chad Baker/Digital Vision/Getty Images
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