Its really easy to bend the tin, and even better — from a thin sheet of colored metal, but of course not for sending by post. Make at the top, not a bent valve, the opening and hang the envelope on such stud and the wall next to the table, which prepare lessons. He will become a repository for leaves under drafts, notebooks, writing paper and drawing pencils.
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WITHOUT ALTERATION OF THE POWER SUPPLY
In Amateur radio practice, there are situations when 9-volt DC source you need to obtain 12, and then a higher output voltage. Bail in such cases can I designed a compact transformerless...
FIRE… WATER
That a few liters of water enough to obtain a flame of high temperature (200° C), make sure everyone, read the description of the device developed by me to the cell. Big flame...
