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.“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.
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 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.
Fluorescent light (LDS) are widely used today in various industries and in everyday life. Unfortunately, the durability of LDS is extremely low. Their weak spot — helix required for the ignition of the phosphor inside the lamp at the time of inclusion. Two of them — from both ends of the lamp, and if even one of them burn out, to include LDS with the standard circuit (containing inductor, capacitor and starter) is impossible. In such a situation it is necessary to change the blown bulb with a new one. Therefore, where there are a large number of lamps (for example, in manufacturing plants, apartment buildings, stairwells and other similar cases), during the years of operation goes down and accumulates a lot of LDS with blown spirals.
This switch Christmas garlands periodically includes four groups of lamps. The switching frequency can be changed within wide limits by the variable resistor R5 (see diagram).
Simple dual-band receiver of direct amplification on a hybrid chip К237ХА2 can collect even a novice hobbyist. Moreover, the sensitivity and selectivity it even higher than the equivalent discrete components. And to make it easy.
Probably you happen to see this picture: all the appliances in the apartment turned off, and the meter disk rotates slowly. It turns out that the culprit door electric bell: its primary winding permanently connected to the network.
In the design of devices and equipment before the radio often question about their design: sometimes they place boards and panels of their devices in boxes that slides, fishing gear and other containers. Ham D. Plewinski offers as buildings to use more modern products — cases videokasset: they have a low cost; plastic from which they are made, can be easily processed.
Alexander Konochkin — student of the physical-technical faculty of Tomsk state University. The choice of the future profession is not accidental — since childhood Sasha enjoys improvised technical creativity.
Revision of power supply EPS-35. Every radio Amateur, equipping a workplace, in its own way solves the problem of providing it with power supply (SP). Some prefer powerful UI with an output current 10 and 20 a, And someone is satisfied with a simple and low-current (up to 2). The taste and color, as they say, no friends. From my point of view, home laboratories should have a SP with output current not less than 5 and the overload protection on the output.