Master classes:
Laser Installation (Two ways)
It turns out that laser setup is just as simple. Then I will tell you how to make a laser installation, called - Spirograph!
Pencil Flashlight
Another rather dangerous experiment. In no case do it alone. Only under the supervision of professionals. Connect the stylus from the pencil to the machine battery, you get a flashlight. But if connected incorrectly, everything can burn out.
Electronic Listening Device
Want to feel like a spy? This device will help to eavesdrop on a conversation through the wall. An irreplaceable 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
Powerful laser from an old DVD
For many, after a small computer upgrade, old unnecessary parts remain. And if among them was a DVD-drive, then rejoice, you found it a great use. Make it a powerful laser that can light a match and pop balls! You
Assembling a subwoofer with your own hands!
Do-it-yourself subwoofer is much cheaper and better than Chinese models. Yes, and much more beautiful. . .