To prevent access by children to “adult” or colecciones books stored in a shelf with sdvizhnye glasses will help ordinary furniture lock with retractable tongue and bent from steel strip. The thickness of the strips is determined by the gap between the panes.
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FLASHLIGHT-IMPROMPTU
Flashlight-impromptu can be made from storage battery and a bright led. The battery is installed between the findings of the led, observing polarity, and fasten a large sandbox or...
SIREN FOR MODEL
The device is useful for a model fire truck and a guard system. The intervals between the signals and their duration is controlled by changing values of electrolytic capacitors C1, C3,...
