Want to feel like a spy? This device will help you eavesdrop on a conversation through the wall. An indispensable thing for a spy. To make it, you will need: a medical stethoscope (sold in a pharmacy for about 300 rubles) and two cheap microphones from a computer (70 x 2 = 140 rubles). Watch the video for the manufacturing process. As a result, you will get a cool spy gadget for about 440 rubles. Useful and simple!
Electronic listening device
Similar master classes
Particularly interesting
Cable antenna for digital TV in 5 minutes
A selection of simple and effective schemes.
Three-phase voltage from single-phase in 5 minutes
Starting a three-phase motor from a single-phase network without a capacitor
Eternal flashlight without batteries
How to make an inexpensive but very powerful LED lamp
Comments (0)