Eternal flashlight or Faraday flashlight

Eternal flashlight or Faraday flashlight This is the name for a flashlight with an alternative power source. That is, this flashlight does not require batteries or battery charging. To light it, you need to shake it. The flashlight itself contains a generator and a battery.

Let's first take a look at the factory flashlight:

I tried to paint the design as much as possible. The point is that the cylindrical constant magnet dangles freely in the tube-housing between rubber stops or springs (wherever). And in the center of the tube there is a coil wound. When shaken, the magnet moves up and down inside the coil, creating alternating electricity in it.

Next, this electricity enters the diode bridge and turns into constant electricity and charges the batteries with a voltage of 3 volts.

Let's look without the case.

We see a solenoid, a cylindrical magnet, limiters, a small board with diodes, a switch, and batteries. Oh yes and Light-emitting diode on the board.

Shake the flashlight and turn it on. Works !

Here's our prototype:

Tick-tock box. The tube on which the reel is wound is the body of a ballpoint pen.A couple of magnets from a hard drive, there are some there. Yes, capacitors are used instead of batteries. White Light-emitting diode. a couple of diodes.

Scheme. There is a peculiarity of coil winding. As you probably noticed from the diagram, the coil consists of two windings, the total length of the coil is 40 mm. Divide mentally hit. In the first half, we wind 600 turns of the thinnest wire with a diameter of approximately 0.08 mm. And in the second half there are 600 turns. That's all - the two-section coil is ready. Further according to the diagram.[/left][left]Don’t forget about the limiters so that the magnets push off and jump quickly.

And here is my more powerful example. A coil with a large number of turns and a three-section magnet have already been used here.

I wish you successful homemade projects!