How to Make a Spy Mic

Written by palmer owyoung
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How to Make a Spy Mic
You can use a stethoscope to create a spy mic. (Hemera Technologies/ Images)

A spy mic can be useful for listening through walls or doors when you want to hear what is being discussed on the other side but don't have access. Using an old stethoscope and a pair of microphones, you can easily construct your own spy mic for about £13. You can also attach a recording device to the mic so that you can record what's happening in the room even when you aren't there.

Skill level:

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Things you need

  • Stethoscope
  • Multimedia microphone
  • Strong adhesive glue
  • Mini cassette recorder
  • Drill

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  1. 1

    Buy a stethoscope from a local drugstore in your area. Get a pair of multimedia microphones from an electronics shop.

  2. 2

    Disassemble the microphone and bring out the condenser mic inside. Do not disconnect any wiring yet. Just get the mic exposed.

  3. 3

    Take the stethoscope and remove the ear pieces.

  4. 4

    Use a drill to make the holes on the stethoscope bigger to match the holes of the mic housing in the microphones.

  5. 5

    Add some glue to the ear pieces, and push them firmly into place in the stethoscope.

  6. 6

    Test if the spy mic works. Plug the headsets jack into a mini cassette recorder and place the chest piece of the stethoscope against a door where someone is having a conversation on the other side and press the record button. The stethoscope will amplify the sound and the cassette recorder will record the conversation. You can also hide the stethoscope in a room to eavesdrop on conversations and retrieve it afterwards.

Tips and warnings

  • Recording conversations without prior consent is illegal in some states. Please be aware of the legal ramifications of your actions before using this knowledge.

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