Master classes:
Electric bike
Electric bike - the name speaks for itself. This electric bike is described in the article.
Lemon battery
For our battery we need: - a lemon - a piece of copper - a piece of zinc That's all. . .
Night-vision device
If you are in complete darkness and think that no one sees you, then you may be mistaken! This article describes a device with which you can see in complete darkness. It is not so complicated and quite repeatable. . .
Original lamp from a bottle
I didn’t think that something good would come out of the glass bottle. It turns out that you can make an amazing lamp or a night lamp out of it. . .
Charge your mobile without a power outlet
Very often there are situations when the battery on the phone is dead, and there is no power outlet at hand. Or do you know that, for example, on the road you will have nowhere to "get too busy".
Color music
I will tell you how to make color music on LEDs so that it is colorful. ..
Simple self-contained burglar alarm system.
Sometimes there is a need for an autonomous inexpensive security alarm, for example, for protection in the country. The use of industrial designs in such cases may be economically impractical.
Laser alarm
Robbers and other intruders are becoming smarter every day. Many, like me, do not have an alarm. And if you are not at home, then your values become easy prey for the criminal.
The simplest electric motor
Here is the simplest and most primitive electric motor, i.e., a converter of electrical energy into mechanical energy. . .
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