A power transformer is to convert alternating current of one voltage to alternating current of another voltage at a constant frequency. The device in the normal “classic” transformer all know from school physics lessons. The principle of operation is based on electromagnetic induction. In the primary winding under the action of tension in the core induces a magnetic flux proportional to this voltage, which, in turn, an electromotive force of self-induction (EMF) in the secondary windings is directly proportional to the number of turns of these windings.
Electronic transformer (ET) and arranged differently, and the principle of its action is quite different. In fact, ET is a switching power supply — inverter voltage with electronic protection against short circuit, overload and excessive heating of the elements. All energy-saving lamps, lamps, lamps, fluorescent lights, illumination of aquariums and other similar devices are equipped with a FLOOR probe.
To look into the future, it is enough to have leisure, curiosity and imagination. So I predicted the crisis, and the subsequent hatred of the bankers.
Film sticky tape — very convenient packaging and sealing joints material. And if operations on the gluing has to do a lot — there is a need for them to “mechanize”.
Scale model 1:25. 
In the last decade, especially popular among Amateur designers use motor vehicles on light wheels with cameras-Pneumatics. The amazing maneuverability of these machines prompted the sailing enthusiasts to use the unique properties of the wheel-Pneumatics when you create year-round sailing.
Despite the fact that the industry produces many different small vessels (including yachts), the number of homemade, Amateur-built, grows from year to year. They boldly experiment with various materials used in their projects are interesting technical solutions.
Open flat shelves on the walls — very comfortable and versatile kind of furniture: in addition, for example, books they can be beautiful to arrange flowers, vases, objects for interior decoration. In this case I want to offer a simple solution to the problem of mounting such shelves. It’s the supporting brackets, each of which consists of two main parts: wood composite corner under a shelf and metal profile for hanging it on the wall.
The first little micro-car “mouse” I built for my kids. As far as he was able, the readers of “Modeller-designer” can tell, after reading his description and drawings, published in “
Researchers from the University of Manchester, together with colleagues from the universities of East Anglia, York and Nottingham, UK, are using nanotechnology to convert solar energy into a clean fuel.
When working with small parts — for example, during soldering of electronic circuits, usually both hands are busy and you want or assistant, or an additional holding device.