Such a small flashlight can come in handy at any place and at any time, fishing, go down to the cellar, go through the staircase if a light goes out or simply climb under the table when something falls. Hands will always be free with this lamp, since it will be attached with an elastic band to the forehead, and is almost invisible because of its weight. Its advantage is the speed of assembly and low weight, which is almost imperceptible.
Materials and tools:
- soldering iron
- scissors
- Old battery "Krona"
- LEDs 2 pcs
- Resistor
- A couple of scraps of tin
A plate is made from scraps of tin, which will serve as the base of the flashlight. A clamp is soldered to it. It is important to solder so that he holds the battery tight.
In the next step, the plate with the clamp is removed from the battery. The Krona itself is completely disassembled, it will be easier to do this if you use small nippers. It is more convenient to disassemble starting from the top by bending the upper sides. The inside of the battery is thrown away, they will not be needed. About a third of the body is cut off and soldered as shown in the picture.
Next, a terminal block is inserted to which the LEDs are soldered in series. It is important not to forget about polarity.
Now the limiting resistor is soldered, and a small switch.
Everything is checked and the structure is poured with resin or with an adhesive gun. Gum is also attached to them.
So, the finished flashlight looks like. True, he has one minus - the charge is not enough for a long time, the brightness of the LEDs begins to fall after about 10 hours of operation. Perhaps you should come up with some kind of stabilizer for him.