For portable electronic equipment need a small volume and weight of the power supply. To solve this problem relatively simply by replacing passive LC and active RC filters.“DIMENSIONLESS” ROD
If in a ballpoint pen out of toothpaste, and long rods at hand was not, take the short splice and its extension from the part used stem, cut off from the writing site. To the working rod wrote flawlessly, its tube should be communicated with the atmosphere. Therefore, carefully wash the extension after removing it Read more…
Vocational school graduates, finishing school, to protect diploma. They are often self-development: engineering and manufacturing of complex parts, assemblies, or fixtures. Cartridge-machine — theme of the graduation project of the former student of vocational school № 40, now training master M. Arkhangelsk.
Smoothly change the brightness of room lighting or hall comfortable with the thyristor voltage regulator (see Fig.). The scheme allows you to adjust the load voltage ranging from 220 V to 0, 25 W to 1 kW. But if the thyristors to supply the radiators, then it will increase to 1.5 kW. The main elements of the regulator, the thyristors V1, V2, included a counter each other and parallel to the load. They alternately pass current in one or in the other direction.
Usually a heavy box, container or pallet with a load attaching to a lifting mechanism using four ropes-slings; lumber, pipe of large diameter it is possible to raise two. If you overwhelm sling loop-the loop, the normal load will rise and it one. Well, if you want to move, say, heavy sheet metal?
In No. 10 for the year 2007 was published material designer homebrew A. Knyazeva from the city of Rasskazovo of the Tambov area made them a few snowmobiles. More detail in the publication was lighted the fifth design with the engine M-11FR from the Yak-18U, cabin and ski from the Yak-12. Today the author talks about his sixth, and as he says, the most successful design.
In many cities on the lively streets and highways have electronic thermometers. Some of them, with light of a mercury column, like an ordinary thermometer, the other made in the form of a digital display. To make such devices themselves is not available to everyone. But the simplified design of the indicator can be manufactured by the forces of the circle of automation students.