The flashlight is powered by the heat of your hand
What kind of human energy is not used to convert it into electricity. Now we got to the thermal one. I'll show you how to make an eternal electric LED flashlight that uses the heat of our body.
One of the Western companies produces similar flashlight keychains that use the heat of your finger. It's shining there alone Light-emitting diode. I decided to increase the size of the lantern, making a full-fledged eternal lantern.
There will be enough electricity to brightly illuminate the LED panel from the old battery flashlight.
What do you need to make this eternal lantern?- Peltier elements – 4 pieces, buy here – aliexpress
- A piece of aluminum.
- Boost Converter – aliexpress
- LED panel from an old lantern.
I talked about the operation of the element in the previous article - free energy in your home, we will not dwell on this.
Lantern diagram
The circuit is like this - all 4 Peltier elements are connected in series: plus to minus, and then this circuit is connected to a boost converter.
Pre-check
We take out a large radiator and check the functionality of the circuit. The radiator cools the elements from the bottom, and I heat them with my hand from the top.A voltage of about half a volt appears at the output of the elements. This is enough to run the boost converter. Light-emitting diode, connected to the output of the converter, glows brightly - indicating its operation.
Making a lantern using Peltier elements
Now we will bring everything to life. Take an aluminum sheet and cut a strip. The thicker the aluminum, the better. 1-3 millimeters will be enough.
We cut out blanks such as shoulder blades. There will be Peltier elements in the center, and the wide ends will serve as radiators.
We bend the blanks to make it look like a spaceship from science fiction films about space. There should be space between them. The wires will run in the center. Plastic covers completely hide the radiator inside the handle, preventing the heat of your hands from being transferred to the radiator. This way we only touch the thermocouples.
We twist the plates, install the elements, press them with plastic pads, and pass the wires through. We attach the converter to one of the plates.
Let's make small ears for attaching the lantern. You can use thinner aluminum for this. We connect and solder everything.
That's all.
The best time to use this flashlight is of course winter. When it’s zero or minus outside, your hands are not very cold yet, and using such a flashlight is quite possible. For better effect, hands can be changed periodically.
Try doing something similar yourself. It is not so much difficult and expensive as it is spectacular and exciting.
