One day, I’ll want to try built a laser mic for spying.
Below here is a video demonstrates how to build a laser microphone, a device used by intelligence agencies to eavesdrop on conversations from a distance.
The creator uses readily available materials and explains the science behind how the device works, including how sound waves are captured and converted into an audio signal.
This laser microphone can pick up sound from a distance using just a laser and receiver. This technology was first used during the Cold War by the KGB and is still used today.
By shining a laser beam at a window, sound waves inside the room cause tiny vibrations that modulate the reflected light. Using a photodiode sensor and an amplifier circuit, we can convert those fluctuations into audio.