Usually automatic device switch on and off the Christmas tree lights in leaps and bounds, without changing the brightness. But the electronic switch scheme is presented in figure — does not have this drawback. The basis of his work is based on the principle of beats that occur between the frequencies of the mains and generator. The latter is a multivibrator transistors T1, T2. It generates rectangular pulses with a frequency of (100 ± Δ) Hz (100 Hz is the fundamental frequency of the multivibrator, And the frequency of the beating, which switch lamp garland which is in the range of 0.1—8 Hz). Adjustment of the burning time of the lamps is variable resistor R6 “Smoothly” and R7 “Rough”.
SMOOTH SWITCH
27 August 1957 the world has heard the TASS report about the successful test in the Soviet Union the first ever multi-stage Intercontinental ballistic missile. And on September 17 of that year at the solemn meeting in the House of Unions, devoted to the 100 anniversary from the birthday of the founder of theoretical cosmonautics K. E. Tsiolkovsky, with a large presentation was made by corresponding member of the USSR Academy of Sciences S. P. Korolev. His name then did not say anything to the masses, except that the veterans recalled the newspaper line distant times of rapid development of Soviet gliding.
Who has not seen the transparent walls of the greenhouse are collected moisture drops? What if to collect it — it’s distilled water, so the motorist and photographer, and Amateur chemical experiments. Of course, the greenhouse is not every hand, but the simplest installation on the basis of the greenhouse effect can make any. To do this, take a transparent film, and tightly close it on top of the neck of the pot or tank, and tilt it so. to the drops of condensed vapor dripped to the bottom, where they can gather.
For screwing a screw includes a head, screw slot. And studs there is nothing: only a cylindrical body with thread. For screwing it in parts, there are special tools, but many of them are uncomfortable to use or has significant disadvantage as an unnecessary waste of time before and after the screwing — on training tool for surgery or subsequent release.
Submarines — class ships to naval fleets, is designed for attacking ships and land-based enemy targets from a submerged position. They are divided into missile and torpedo.