In order to ensure the safety of electrical equipment during sudden surges, there are special systems surge protective. They help to avoid breakage and equipment failure.
Ham radio
LEARN TO CONTROL YOURSELVES
What is auditory training? Is the ability to replace eight hours of sleep sorokapyatiletnyaya rest. This exclusive attention, phenomenal memory, the ability to “turn off” the pain, stop bleeding, keep warm in the fierce cold. But to master the skills of autogenic training only under the guidance of knowledgeable teachers, working hard for many months and even years. Step by step develops the subtle introspection, a vivid imagination and an iron self-control, the student seizes the opportunities for active relaxation and concentration, learn how to use the formulas of self-hypnosis and consciously control dreams.
THE BREADWINNER OF THE BATTERY
Suggest a charger circuit for battery cars. Charging current of 5 — 6 a, the voltage at the output 20 V. the Circuit provides a smooth stable run, simple to technical solution, and most importantly, the device can be easily manufactured at home. Properly collected scheme of known-good parts does not require adjustment.
THE SUPERCAPACITOR IN YOUR POCKET
We offer a simple pocket radio with low voltage power from the supercapacitor. The receiver is fully on transistors, because the low voltage does not allow to use the existing chips (e.g., 174ХА10). Receiver of direct amplification, which provides sufficient volume to broadcast stations in the medium waveband and working in a range of supply voltages from 2 to 0.9 V.“CHARGER” FOR ALL
The proposed device allows you to charge any rechargeable batteries with voltage from 1.2 to 15 V and a nominal capacity of from 0.05 to 20 A·h and can be widely used in radio, car owners and even users of electronic equipment. The device is a charger (current stabilizer), which uses a pulse-frequency regulation, which eliminates the need for bulky heat sink from the control transistor.MINIATURE CIRCUIT
In the “M-K” appear frequently describe designs that use integrated circuits. The production of these modern elements are so expanded that their widespread introduction in household equipment and in the development of ham radio now is no surprise. However, there still exists an opinion that “communication” is with chips only available to experienced hams. Meanwhile, in the chips can be used to create simple devices to collect that it is easy even for those who make their first steps in Amateur radio.UNIVERSAL FOR CHARGING
Small disk batteries are widely used in electronic equipment and in ham radio construction. But to charge them is not easy. Then stir and pure design features: the differences in the size of the disk batteries, no special conclusions for reliable connection to the external circuit and connectors between the individual elements in the batteries. In addition, it is necessary to control the magnitude of charging voltage and current using electrical appliances.“CHARGING, STAND AT ATTENTION!”
CHARGING AND RECOVERY DEVICE’S BATTERY. The battery in the car is one of the most important elements. Despite the constant efforts of manufacturers to improve the reliability and durability of the batteries after 3 — 4 years they still come into disrepair, aided by a constant undercharge when riding in urban environments the cost of the battery remains high, so to extend the term of its service makes sense at least once in the summer season to carry out remedial exercises.SMOOTH SWITCH
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”.
THE PURPOSE OF AFFECTS… LIGHT
The light on the dash must have heard many. A pistol or shotgun just like the real thing, the rings of a target with a ten in the middle. Yes, but “bullets” are not the same. Pulled the trigger and the target affects short flash of light. And the brighter dalnoboynie weapon. The light beam of the flash lamp to “shoot” at a target even from a distance of 25 m. This corresponds to one of the distances sports bullet shooting.