Homemade power supply
|Homemade power supply|
If you do not have at hand a set of fresh batteries, you can make a homemade power source. To do this, you will need two carbon rods from an old battery, two woven pouches with diameters of 20 ... 25 mm and a height of 60 mm. The rods are installed in them and filled with activated carbon (crushed medical tablets). The electrolyte used is the following solution: dissolve 5 tablespoons of common salt, 2 g of boric acid and 3 g of sugar in 1 l of water. The walls of the glass jars should be painted with black paint. The power supply will produce a voltage of 1.5 V.