Homemade power supply

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

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