Generators of low frequency oscillations, as is known, can be used as a caretaker: intermittent loud noises warn of the approach of a stranger. On the same principle and made our “Keeper”. It is assembled on the transistor T1 and the transformer TR1 (Fig. 1). Load — the loudspeaker TP1. The chain of positive feedback R1, R2, R3, R4, C1 provides periodic self-excitation of the generator.THE INVISIBLE WATCHMAN
Generators of low frequency oscillations, as is known, can be used as a caretaker: intermittent loud noises warn of the approach of a stranger. On the same principle and made our “Keeper”. It is assembled on the transistor T1 and the transformer TR1 (Fig. 1). Load — the loudspeaker TP1. The chain of positive feedback R1, R2, R3, R4, C1 provides periodic self-excitation of the generator.
Few, probably, ever see a modern sailing ship. It is widely believed that in our age of powerful engines and high speeds boat the best place in sports or for training cadets of sea schools.
Changed by the early 1980s, the concept of action of artillery on the battlefield demanded not only “increase its power, range, maneuverability.” The foundations were laid for integrated automation of process of firing via a combination of reconnaissance and communication systems and data processing; design and creation of “smart” artillery of the samples.
It would seem that in this field of mechanics it is difficult to come up with something new: in the friction units of machines and devices have from time immemorial used bearings two main types — ball or roller (rolling) and a stub or vladishev (slip). Not only the device but also of their traditional materials: steel, Babbitt, bronze, textolite, special cast iron.
Memories of childhood and adolescence accompany the person in his life: about the native log house with a Russian stove; the sun warmed the dusty paths of the garden, the goats (most of the emphasis in conversation and make on the second syllable) for sawing wood, standing in a corner in the yard near the woodshed…
On the night of November 1, 1924, the workers took the first car entirely manufactured in the factory AMO. One of the mechanics, bent his head low in front of the radiator with the Soviet, and not a foreign brand, spun winding the handle-and AMO-F15 No. 1 came to life. A few laps in the factory yard did then this… not even a car, and naked – without a body and cabin – chassis with inverted box on the frame instead of the seat.
the SPECIAL ASSAULT AIRCRAFT of JAPAN. By early 1945, the Japanese military-political leadership was aware that sooner or later we should expect the allied invasion to the territory of Japan proper. This understanding has penetrated all layers of Japanese society. The bombing of cities and industrial enterprises were conducted daily, and the armed forces of the Empire fought desperately, pressed on all fronts.
“Dear edition! In rooms 11 and 12 your magazine from 1973 published a description of the guitar in Leningrad designers and lovers Guzina O. and D. Med, hex. The tool we liked.
I remember a few years ago in the journal “modelist-Konstruktor” there is the material possibility of measuring electrical capacitance using a PC “Specialist”. Then published the program in machine code that allows with reasonable accuracy to determine the values of capacitors in the range of 0.1—1000 UF, and later version of it written in forth language, for which the wording, of course, a huge thank you!
We are not talking about armored planes-fighter planes or combat helicopters, and about real tanks on the tracks. But with wings. It came up in the early 1930s, American designer Walter Christie’s tanks. He proposed to attach to the tank wings and tail, and his powerful motor to make spin the propeller.