More rapidly advancing digital satellite TV, coming to replace the bulky radioligand lines. The population of our vast country, even in its most distant corners, appeared a real possibility of a wide choice of television channels with excellent quality of image and sound. Therefore, a great demand began to use satellite receivers with antennas in the form of “saucers.” Installation of reception of the electronic equipment does not cause trouble, but with the installation of the antenna sometimes there are difficulties: for example, in the zones of “shade” trees, high buildings, etc. In some cases, the reception of the satellite TV signal even becomes impossible. There is a need to install antennas as high as possible to get out of the “shadows.”
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Monophonic electronic musical instrument (see figure) is assembled on a single chip К176ЛА7 containing four two-valve “AND—NOT”. On D1.1 is made the generator of frequency vibrato. The oscillation frequency at its output is 5-8 Hz. For valves D1.2 and D1.3 tone generator, and the D1.4 — the generator of high frequency oscillations. Thanks to our latest AMY can be used as a prefix to any radio receiver having a medium wave range.
Remote from the television station areas, in zones of uncertain reception of television signals of meter (MB) and decimeter (UHF) ranges have to install industrial television broadband antenna of the type ASP-8W, “LOCUS”, “DELTA”. Each of these antennas comes with a amplifier which can have a different magnification strength of incoming signals and is chosen for specific conditions of admission (for example, SWA14 gives signal gain 32 dB, SWA9000 — 38, SWA1L — 8 to 10 dB).
The safety device that signals the limit of the battery, must have for every modeller. The scheme of such a simple electronic device — figure 1. The unit is connected to the battery pack and press the button S2. If the supply voltage exceeds 10 V, relay K1. But as soon as this value is reduced to 10 volts, Zener diode is closed and relay K1 is de-energized. Contact K1.1 includes a signal lamp H1.
Adjusting the temperature of the local heating using the original heating element. The idea of local heating of a small area is implemented with the help of available details that it will probably in the reserves prudent owner, including, of course, owned and hams. Moreover, as the heating element applied to ordinary fixed resistor with a power dissipation of 2 watts. Depending on the power and resistance of the constant resistor can be achieved heating limited site to a temperature of -40 °C or even 60 °C.
Carbureted internal combustion engines with ignition systems with contact breaker are used in automobiles, motorcycles, motor boats and other vehicles. For such systems uses a variety of so-called electronic ignition systems, improves the process of interrupting current.
This miniature power pack sits in the battery compartment handheld radios, calculators and other miniature electronic equipment where they need to be connected to AC power. After capacitor C1, Zener diode V1 and V2 (see diagram) we obtain the rectified current voltage of 15 V. It is used to supply voltage to the transistor V4. During the negative half-wave current of the diode V3 returns to the power supply portion stored in the power transformer.
Many people keep different Pets, communication with which brings a lot of pleasant moments for both children and adults. However, there are those animals, which are also constantly live with the man and often visited his home (for example, mice, rats). But they are uninvited guests and even harmful, as they are considered (and probably not without reason), carriers of different pathogens of dangerous infections.
When performing electrical work have to drill a very large number of holes in the walls and partitions. In a brick or prefabricated houses not to dispense with carbide drills. However, such a tool is not enough for a long time: the working edges of the drill bits become dull and crumble and need to be sharpened. This is typically done using special “green” wheels, but they are expensive and wear out quickly. Faced with this problem, I started looking for alternative technology and stopped at electroerosion grinding devices.
On the instructions of the enterprises of Dzerzhinsk-khimpromenergo in the design office of the school # 2 of Dzerzhinsk, Gorky region, the guys have designed and built a device for measuring the pressure of neutral media in the pipes — an electronic pressure gauge. One of its founders, a student of the tenth class Sergey Whalin, said that the installation or repair of compressors necessary to carry out Express-analysis of the condition of the equipment. Devices, testifying to the extent necessary for a specific production, yet.