In some cases, unforeseen situations arise when a person may need a small flashlight or a compact light source for certain tasks. Few people know that using a syringe, magnets and special enameled wire, you can independently make a small portable generator that will allow you to use emergency lighting for a short time.

It should be noted that such a compact device, made from a syringe, works and begins to generate energy due to ordinary shaking. Simply put, this homemade generator does not use batteries as a power source, but generates energy for work by shaking the device.


    • 0.1 Materials and tools required:
  • a The process of creating a homemade generator
    • 1.1 The important points
  • 2 Conclusion

Materials and tools required:

  • round magnets in the amount of 12-14 pieces (you can buy Aliexpress);
  • plastic sheet;
  • super glue;
  • insulating tape;
  • enameled copper wire (0.15mm);
  • diode bridge (MB6F);
  • flashlight with built-in generator;
  • syringe for 20 cubes;
  • several LEDs (about 2 pieces);
  • lithium battery (tablet);
  • push button switch.

The process of creating a homemade generator

At the first stage of making a homemade flashlight from a syringe with a built-in generator, you need to take a sheet of plastic and carefully cut out two identical washers from it.

It should be noted that the inner diameter of the washers should correspond to the size of the outer part of the vial of the purchased syringe. Then the washers should be put on the syringe itself and glued to its surface with super glue. The gap between the two washers should be about 3-4 cm.

At the next stage, a small hole should be made in the washer located closer to the nose of the syringe. After that, it is necessary to carefully pass the thread through the hole made. Then, between the two washers located on the syringe, you need to wind it. It should be noted that the winding of the wire itself should consist of about 1.5 thousand turns. After creating the winding, it must be fixed with electrical tape.

After winding, you need to take the plunger and disassemble it from the rod, which is on the syringe itself. After that, the disassembled plunger should be pressed directly into the syringe bottle itself, towards its nose, to the stop.

Then you need to take the magnets, connect them together and place them in a vial. Once the magnets are placed in the syringe, the vial should be sealed.

As a stopper, you can use the rod stopper and another piston.

When agitating this design, as the magnets will pass through the wound coil, energy will gradually be generated. In addition, the more intense the speed of movement of the magnets, the higher the indicators of the voltage generated by this homemade generator will be.

After sealing the vial on its surface, using hot melt adhesive, you need to attach a lithium battery.

A diode bridge must be placed on the negative terminal of the battery using a soldering iron. Connect a wire to the “+” terminal, which must be brought to the bridge itself with the same end. Then, to the bridge itself, it is necessary to carefully solder the ends of the winding located on the bulb.

After connection, the diode bridge must be carefully isolated. For these purposes, you can use heat shrink tubing.

At the final stage of assembling the flashlight, we place a switch in the electrical circuit. It needs to break the circuit on the “-” wire, through which the syringe contacts and two LEDs installed on the nose of the syringe are powered.

The important points

When creating this fake, it is necessary to correctly select the size of the syringe and the magnets placed in its vial. Simply put, when shaking, the magnets should move freely inside the bottle. In addition, it is recommended to use low-power LEDs as a light source in such a device. The switch, battery, LEDs and winding should be securely attached to the surface of the bulb with insulating tape and hot melt glue.


A homemade flashlight with a generator made from a syringe works great in all weather conditions and temperature changes. Such a device does not require any servicing or maintenance. The user only needs to shake the bottle several times and the homemade generator will start charging the battery installed on the flashlight. Another advantage of this device is its simplicity of design. Therefore, even those who do not have experience in electronics and soldering can make such a flashlight.