The eternal flashlight or Faraday's flashlight is the so-called flashlight with an alternative power source. That is, this flashlight does not require batteries or battery charging. To "ignite" it is necessary to shake it. In the flashlight itself is a generator and

A cooler windmill is more of a toy than a real one. It produces 1.5 - 2 volts with a breeze of 4 km / h and a current of 20 mA, which is enough to charge one battery. But you can do more than one, so there is still a prospect. . .

Since there is no magnetic sticking, the propeller merrily rotates from the slightest breeze, which you do not even feel on the ground. With a working wind, it develops high revolutions, I have an ammeter for 2A direct connection, so it often surpasses 12

In the economy of the radio constructor, there will always be old diodes and transistors from radio receivers and televisions that have become unnecessary. In skillful hands, this is wealth that can be effectively used. For example, do-it-yourself solar panel

The solar battery is a device for converting the energy of the sun into electricity. The high performance solar panels you can buy at Radio Shack and other stores are made from specially treated silicon and require huge

This simple device can come in handy when fishing, camping, etc. places. With it, you can charge a mobile phone, mp3 player, flashlight, etc. Lightweight, compact wind generator will be your assistant. . .