How to make an eternal flashlight without batteries. Option with high brightness and glow duration

Electronics 22 986 1

This flashlight is the best assistant in a sudden or emergency situation in the absence of light. It is always ready to work in any weather conditions, extremely reliable and unpretentious. And thanks to the use of a simple electronic circuit, it has a high brightness and long operating time. Such an “eternal” flashlight can be made from inexpensive components in just a couple of hours.

How to make an eternal flashlight without batteries Option with high brightness and glow duration

Details

Ionistor at 0.047 µF and 5.5 V.
Transistor MP38A or any other modern one.
Ferrite core from an energy-saving lamp with a diameter of 10 mm.
Button.
Two resistors - 1 kOhm and 4.7 Ohm.
Varnished copper wire with a cross-sectional diameter of 0.25-0.55 mm for the transducer.
Varnished wire with a cross-sectional diameter of 0.1-0.25 mm for the main coil.
2 LED.
A long neodymium magnet (an assembly of several magnets is also suitable).
5 ml syringes - 2 pieces.
Syringe 30 ml.
4 Schottky diodes SS14 or SS34.
small lens.

Making a flashlight from a Spitz without batteries

We use two small syringes to make a battery for our flashlight.We cut off the nozzles of the syringes at approximately the 2 ml mark.

Using thin plastic scissors, cut out two rings according to the diameter of the syringes.

Using hot glue, attach one ring to each syringe - these will be the boundaries of the main coil. We fasten the halves of the syringe end-to-end with tape. It should look something like this:

Now we wind the main coil. You can do this manually, or you can thread a long screw through the syringes, secure it with a nut and washer and wind it with a screwdriver. We will wind copper wire with a thickness of 0.1-0.25 mm.

When the main winding is ready, you need to test the finished battery. We connect to the coil outputs Light-emitting diode, and put a neodymium magnet inside.

If there is enough winding, then with intense shaking Light-emitting diode will flare up.

Now you need to assemble the boost converter. For the conversion coil we use a ferrite core from an energy-saving light bulb, onto which we wind 20 turns of wire 0.25-0.55 mm thick, folded in half. We cut the opposite ends and solder them together something like this:

We make a diode bridge from step-down Schottky diodes.

Next, we solder the entire structure, focusing on the diagram below:

We put neodymium magnets inside the main coil and cover the sides of the battery with rubber bands from the pistons.

We solder the previously assembled circuit to the main coil, and install the finished structure into the body of a 30 ml syringe. We make a hole in the body for the button.