(Continued. Beginning at No. 1′ 2005)
Instruments based on the radio. Modification of the receiver “VEF-Spidola”
The radio is a transistor superheterodyne (Fig.For the; scheme of the old GOST) and is designed to receive the stations in the bands long, medium and short waves. The receiver contains a mixer, separate local oscillator; three stages of the Ombudsman, the amplitude detector and uzch the complex except “spidoly” is universal prefix for testing semiconductor devices and the measurement (determination) of their basic parameters. Since the complex devices will be used in stationary conditions, power is supplied from a network source, is a separate external unit.
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The era of universal shortage has prompted us to create the things in the shops it was impossible to find. However, the era of abundance has not stopped this process. Apparently, a modest domestic work is now subject to other laws dictated by market prices or a passion.
Compact consumer electronic devices gadgets such as watches, alarm clocks, radios, toys, weather stations and other similar devices are available in almost every home. Regularly and everywhere, home owners have to ensure their power supply batteries with a nominal voltage of 1.5 V (“AA” AA and “mizinchikov”, “AAA”) or of the disc type CR, AG, etc. – with a voltage from 1.5 to 3 V. considering the fact that the power supply elements (batteries) are increasing in price (like everything else), the author offers a more rational solution for the cost-conscious owners, namely, to apply to the food in the house and (or) a favorite with owners of devices powered by household electrical outlet using the AC adapter. Thus, the cost for the family budget significantly reduced, since do not have to constantly buy batteries.
There are situations when the lighting is required to manage not one, but two places. For example, when you need to turn on the light when entering in a number of areas on and off when you exit from the common hallway. The situation is similar in terms of covered walkway, tunnel, greenhouses or the like of the long room.
New year without snow Maiden — not a holiday. Precursor to new joys and happiness appears charming dadomo-pink granddaughter: as always, your wonderful sparkling outfit. And let it supplements this time a magical decoration in the form of stellate-iridescent headdress (Fig.1) or the headband with miracle gems (Fig.2)…
The profession of pilot, astronaut, test flight of space technology require absolute health and exceptional emotional stability. To determine the degree of emotional stability of each person with the help of an instrument called emocionalnom. Such a device is designed and manufactured in the Club for young technicians Novosibirsk Akademgorodok.
You’ve probably heard: “he’s Got good reflexes.” Thicket just as they say about athletes. For example, the goalkeeper. He must react instantly to the ball rapidly flying into the net. Or runner, the reaction of which the starting pistol is calculated for fractional seconds. The ability to find the right solution in any sudden situation, it is important for the pilot, the driver, the driver of the tram or trolleybus.
Instruments based on the radio. Determination of the frequency of an unmodulated source, an external signal. With the help of measuring GS you can configure any radio transmitting and radio-emitting devices in the frequency range 150 — 12 000 kHz, in the CW mode, and the mode AM or IM. In the absence of signal modulation of an external RF source (CW mode), its frequency can be determined by the method of zero beating with the frequency of HS. The block diagram implementation of the method of zero beat is illustrated.
When employees of Institute of petrochemical and gas industry named. Gubkin turned in a circle electronic automation of the Moscow Palace of pioneers with a request to produce thermostats for chemical experiments, it is to no one’s surprise. Is not the first creative activities of the children’s team, led by F. Y. Yerokhin, goes jobs scientific institutions and industrial enterprises of Moscow. So this time they decided posed a technical challenge.
To consider, compare, think, manage that work, which are handled by modern computers. With the help of electronic machines is calculated the orbit of the motion of planets, satellites and missiles, the calculated flight speed of elementary particles in nuclear reactors, control machines, production lines, shops and factories. The management of real objects with a computer basically boils down to converting discrete data into a continuous signal. This work is done by auto binary code converters — descramblers. The layout of one of these converters built in school No. 511 of Leningrad. Schematic diagram of the layout in the figure.
