Electromechanical meters (hereinafter — meters) are used in industry to control the state (account) and hold the value of any device. Whenever the effects of a constant voltage to the coil (inside the housing of the Electromechanical counter) is changing its digital readings on one. This is achieved by using a winding with the armature, which, in turn, acts on the lever spring retainer, holding the counter wheels bearing digits. The control winding is a direct current. With each exposure to the appropriate stress occurs only one pulling and one releasing of the armature coil of the counter.COUNTER IN LIFE
Electromechanical meters (hereinafter — meters) are used in industry to control the state (account) and hold the value of any device. Whenever the effects of a constant voltage to the coil (inside the housing of the Electromechanical counter) is changing its digital readings on one. This is achieved by using a winding with the armature, which, in turn, acts on the lever spring retainer, holding the counter wheels bearing digits. The control winding is a direct current. With each exposure to the appropriate stress occurs only one pulling and one releasing of the armature coil of the counter.
Designed and made by me lighting device externally, and by construction, some nodes resembles the flashing beacons of special machines. But the purpose of it almost the opposite — creating a smooth bright light, and at low power lamps — at a considerable distance. Well, since the scope of the devices are different and their structures are substantial, but rather fundamental differences.
Did you know that at the time shortwave Amateur radio communication, uniting hundreds of thousands of people in almost all countries of the globe, was to some extent the prototype of the Internet and current provider? In particular, short wave periodically going kind of forums (then they were called “round tables”), which discussed mainly technical issues related to the design of short-wave equipment and the passage of radio waves. On short waves to new friends and keep in touch with old And just this would need a homemade radio transmitter power from 10 to 40 watts and the HF-receiver. A thin “thread” of human relationships extends directly from one user to another without any intermediaries or service providers, without fiber and satellite communication and mobile phone companies.
Electric circuit “call” usually with a tester or device with audible indication. The probe, about which we talk today, informs about the health of an electric circuit with a light signal. He exhibited at the 29th all-Union exhibition of creativity of radio fans-designers. With such a device it is easy to find broken or short-circuited sections in strings and cables, checked relays, resistors, capacitors, fuses, light bulbs, determine the status of the p-n junctions for diodes and transistors. An indicator is a miniature light bulb, for example, CMH10-50.
If the stock is illiquid. burden burden of low-power portable radio (or a set of two stations), designed for communication in civil band 26,9 — 27,2 MHz, offer the option of their useful lives. Often, ham radio is both a car owner and cottager, who, as a person concerned for the safety of your car or suburban house. Besides there are many other areas of application of the proposed security devices on the basis of two portable radios. The main difference from other security systems is that the “alarm” signal is passed through the radio channel and range of action of the protection system depends on the power of radio transmitters and features of the passage of radio waves in the area of application of the system Even if there is only one radio station (CBS stations), is also not a problem as the receiver can use an all-band multimode transceiver type Kenwood FH-7E, Yaesu or similar (more about that below) in the circumstances, the transceiver is programmed to receive the appropriate frequency 27,175 MHz. Automatic shutdown function in the transceiver neutralized.
To debug transistor-based hardware is much easier if you have the regular store stable voltages. Two adjacent shoulders of the bridge rectifier V1, V2 connect the unit Zener diodes V3 — V8 and V9—V14, V15 — V20, V21 —V26 or V27 — V32 (Fig. 1) exercising, in addition to rectifying the current, stabilization of the output voltage 7, 8, 9, 10, 12, 14, 16, 18, 20 or 24 V at a current of 30 mA. When the input voltage is within 110 — 240V output changes by 0.2 V and the current is 1 mA.
Remember, what is the simplest electrical circuit? The galvanic battery and light bulb connected by conductors through the switch (see the article “Ohm’s law” in the “M-K” N2 9, 1978). If such a circuit connection line length of about 30 cm to bring a compass, its magnetic needle will tend to become perpendicular to the conductor (Fig. 1).
Radio, powerful or low-powered — the Fox, which is so earnestly looking for “hunters” at the event. Low-power transmitters on one of the high-frequency transistor of the type ГТ308, П416. They are used for training, demonstrations, and to tune receivers. Diagram of such a transmitter operating in the range of 3.5— 3.65 MHz, — figure 1.
In the early 30-ies of the radio Amateurs of the Soviet Union, mastering of ultrashort waves, for the first time faced the necessity of direction finding of radio transmitters. The experiment was sometimes transformed into an exciting searching game, which gradually take the form of sporting events. In the late 30-ies of the radio orienteering sport is called “foxhunting”. The essence of this new sport was to locate on the ground three to five hidden transmitters with receivers-direction finders. The first transmitter / receiver equipment for “Hunting for foxes” operated in the range of 38 MHz.
Probably few people know that Alexander Graham bell the inventor of the well — known phone made another discovery, which was considered even more significant. We are talking about the electron-optical communication system, it is possible to wirelessly transmit voice at a distance using reflected solar beam. Compared to radiotelephony communication that consumes relatively much electric energy, the invention of hottelephone (so called the bell system) and was, in fact, a real technological miracle.