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.
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.
Varnishes, paints, enamels often Packed in tin cans with a wide lid-stopper. But no matter how tight it fit, the tightness over time is broken: part of the contents when pouring over the edge dries up on the edge and prevents tight closing of the jar. However, when the expenditure of material in small portions Read more…
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.
I travel frequently, so I made myself comfortable Hiking hanger, which is even more compact folding, produced by industry. Of the device it is clear from the figure. The tube can be any, say, plastic. This hanger will be even leaner, if it is to collect two tubes, entering one another. Locking them in extended Read more…
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.
Carton steel doors or bars on the Windows to the concrete or brick walls specialists usually fastened with sharp pins. If you need to remove the box, the case is difficult to pull the pins very difficult, and drown them interfere with the flattened outer ends. For these purposes I used the M10 screws, drilled Read more…
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.
Many families today live in multi-storey buildings and use of household washing machines. Everyone who connects this machine (for electrical switchboards and sanitary communications), knows how important both of these operations. In particular, when defective connection drain pipe to the housing ganovim the pipes of communication may occur leakage of water which not only spoil the mood and the interior, but also bring tangible expenses payment of repairs to neighbors below. Even when quality of connection clamps, tightening the corrugations, and pipes drain hose of the washing machine, we recommend that from time to time to check for leaks and if necessary tighten.