Informing about the occurrence of an event, people often use sound signals. Usually they have the character of a continuous sound “one note” annoying “beep-beep” or howling siren with a periodically varying frequency. Generators of electric vibrations, producing these signals is also straightforward. They are based on one-two multivibrators, which makes the structure very simple, accessible to even beginners repetition hams.SPINNER — WIND
When the father works in the barn, the door often slams shut from the wind. To avoid this, he inserts it under the shovel which breaks down a lot. I offered to make a turn. Attached it to the doorframe when the door is opened the turntable rotates and locks the door. G. POTAPOV, Read more…
To reduce the ripple in the filter of the rectifier sometimes try to put the capacitor as much as possible capacity. However, this is not always safe for the semiconductor valves.
Furniture with doors are not always easy to use. For example, music is better to have in the cupboard, and an open rack with shelves. This facilitates access to both the instrument and its accessories. Not accidentally there are many options of this furniture. For example, as shown here.
Anyone who has been in Yalta, remember, of course, the town’s waterfront, a huge concrete boulders, piled in the sea in front of her, furious roar of the waves in them in stormy weather: the man protected the shore from erosion by such “pyramids” that have no wave to move. But what kind of giant they have raised, brought down to this place? Even dvadtsatipyatiletnih truck compared to one with such a stone — a child’s toy.
Ask any kid, building the first schematic model of what he wants Almost certainly he will answer — about copy. And it is clear. It’s no wonder it is believed that the replica model is one of the most interesting and complex classes of aircraft modeling. Order copies, model airplanes acquainted with the technical achievements of aviation, possess the perfect use of the tool.
Soviet istrebitel-polutoraplan-15. In the early 30-ies of the last century in accordance with the existing at that period, the concept involving joint use maneuverable fighter biplanes and high-speed fighter-monoplanes, the Soviet Union developed several new aircraft, various aerodynamic schemes. Known aircraft designer N. Polikarpov, who achieved considerable success in the creation of a fighter-biplane (in particular, step I-5), was commissioned by the beginning of 1933 to create a fighter-biplane I-13 mixed design. However, in the process of working on this machine revealed that the traditional concept of the fighter has no prospects. Work And 13 closed, and the design team of No. 3, together with the head of it.Polikarpov connected to the development of all-metal fighter-monoplane I-14 design Sukhoi.
The car was conceived and executed as a valid simulator for the novice driver — my 15-year-old son Maxim that he could get it driving skills, and also to assemble-disassemble and repair the machine, mastering the technical “ABC”.
The first flight of the new helicopter, designated V-65, was held in October 1964. This car was designed as a replacement for the aging transport helicopters amphibious S-61 in marine corps of the United States. S-65 had the floats and it can be loaded through the rear hatch even afloat.