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).THE MAGNETIC FIELD IS A SATELLITE OF THE CURRENT
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.
More than two years have passed since then, as I have installed it on your motorcycle “IZH-Jupiter 4” contactless ignition on the basis of voskhodovskogo generator, switch 262 3734 and a homemade diode mixer (Fig. 1.). Making sure the reliable working of my creations, and colleagues conducted such an improvement to your motorcycles However there were questions like, “I drew on your chart — explain why me doesn’t work.”
From Nickel-cadmium batteries with a life expectancy of 100-200 cycles of charge-discharge. Discharge below 1V per cell leads to a sharp reduction in the duration of battery life. How to control a threshold voltage of discharge of the battery during operation? To have with you the measuring device is inconvenient. It functions best to hold the indicator — sound generator with a silicon Zener diode. Its voltage stabilization determines a controlled level of discharge.
Electronics today referred to as the catalyst of scientific-technical progress. It is really hard to find the field of science or engineering, not electronic engineering. Natural popularity that are mugs e-direction in students. As a rule, syut they have a narrow specialization, for example, radio club, club automation, etc. is quite justified. The enduring nature of the lessons (1-3 years) allows students to acquire a deep enough knowledge of the theory and the necessary practical skills by working in any one field of electronics.
With the approach of the New year interest in the “automation tree” increases dramatically. Everyone wants to decorate a beautiful Christmas tree with garlands of “live” light-driven commands to the electronic devices. One of them is the device to create the effect “running fire” — we tell today.
Has long been noted that the viewing of slides, movies, TV shows, as well as any other visual activity (reading, drawing, and examined under a microscope), in unfavourable lighting conditions causes a large overvoltage of view.
The inclusion of transformers on 400 Hz network, 220 V(50 Hz) using a ballast capacitor. If you look at the merits in diversity of industrial and self-made Amateur radio power supplies, it suggests the surprising conclusion. Basically they use the same (from a large item being sold) step-down transformers.