The flashlight does not contain batteries and is ready for use at any time, at any temperature and in any conditions. Does not require any maintenance or care. According to all these indications, it can conditionally be called almost eternal.
The design is very simple and anyone can repeat it, even without knowledge of electronics. The flashlight itself essentially consists of a generator, a rectifier unit and LED.
Details:
- PET bottle caps.
- Syringe 5 ml.
- Neodymium magnets -
- Wire 0.2 mm.
- Capacitor 1200 uF - http://alii.pub/5n14g8
- Diode bridge RB155 - http://alii.pub/5m5na6
- Super bright Light-emitting diode - http://alii.pub/5lag4f
Making an eternal flashlight without batteries
The skirt of plastic caps is cut off and a hole is drilled in the center to the diameter of the syringe. You will need 2 of these rings.
Place the rings on the center of the syringe at a distance of approximately 2 cm.
We take enameled copper wire.
Having clamped the syringe with a cap hiding the needle in the screwdriver chuck, we wind the maximum number of turns along the height of the rings onto the resulting frame.
We glue the contacts into the ring with a stick so that the coil does not unravel.
We take a miniature diode bridge.
Glue it to the coil with a soldering iron using one contact.
We clean the contacts from the coil and solder them to the diode bridge to the AC input.
We place 3 neodymium magnets in the syringe cylinder.
We take an electrolytic capacitor.
And we plug the hole in the syringe with it.
Using short wires, we connect it to the output of the diode bridge according to the polarity.
Solder to the capacitor Light-emitting diode.
The flashlight is ready. If you shake him, then Light-emitting diode will light up for a short period of time.
The principle of operation is simple: when shaking, the magnets in the case move up and down. The coil generates electricity, which is rectified by a diode bridge. It is then accumulated by a capacitor and given to the LED.
Next, you can insulate the flashlight with heat-shrink tubing or wrap it with electrical tape.
The brightness is quite sufficient to search for objects in complete darkness.
Watch the video
Where to get neodymium magnets for free - https://enn.washerhouse.com/4654-gde-besplatno-dostat-neodimovye-magnity.html
