In order to make a flashlight you will need the following materials:
1. An old electric shaver that was running on battery power;
2. The battery from the mobile phone to fit in the shaver;
3. Three very bright LEDs of 3.2 and 250 mA (the author used LEDs with a neutral white glow);
4. Three lenses made of acrylic with a glow angle of 90 °;
5. 2.2 ohm resistor;
6. Soldering iron and solder.
Instructions on how to make a flashlight do it yourself.
First you need to disassemble the razor and remove the knives and the old battery from it.
Next, instead of knives, install lenses that will scatter light. To prevent strong heating of the LEDs, the author made a heat sink plate of aluminum with a thickness of three millimeters (the shape of the plate is attached at the installation site), on which the LEDs were installed using silicone heat-conducting glue.
The author powered the LEDs in parallel through a 2.2 ohm resistor for each, without any drivers.
A battery with a capacity of 800 mAh is enough for about half an hour without interruption, while the author notes a very good level of luminous flux, at a distance of one meter 340 lux with a full battery charge and 210 lux if the battery has half the charge.
A larger battery is allowed to increase the time. robots flashlight from a single charge.
