(Continued. Beginning in № 9’01). To making a universal charging apparatus, it is recommended to proceed only after at hand will be all you need, including tools and supplies. Case size mm 300x200x200 taken or prepared, as the front panel (300×200 mm), handmade. Transformer power 250 VA, is wound on the magnetic core SHL 50×32 mm (for calculations it is more convenient to use the units of measurement universally accepted Amateur practice, when the cross section of the magnetic circuit is expressed in cm2; in relation to the SHL package recommended core 17.5 cm2). If the core is W-shaped, the sectional area needs to be 1.4 times more, that is, 24.5 cm2.
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In 1907, English engineer Round, who worked at the world famous Marconi laboratory, accidentally noticed that running the detector around a point of contact there is a glow. Also seriously interested in this physical phenomenon and tried to find the practical application of “inconceivably talented Russian” — Oleg Vladimirovich Losev.
(The end. Beginning at No. 9 and 10,’01). Electronic watch embedded in an improvised universal apparatus for charging batteries differ from the standard. Instead the category “des. min.” in the output “0.1 CH” is the idea of time is here more convenient for rapid calculations. The maximum count value “of 99.9 h.” Instead of the oscillator used household electricity 50 Hz, and the input of the amplifier-limiter is used for formation of the steepness of the pulses removed from the secondary winding of the supply transformer.
One of the problems for the citizens-owners of vehicles is the condition of the batteries. Frequent stops on subsequent runs of the engine discharged battery, a full charge from an onboard generator is at best one hour. And, as experts say, only 90 percent of waste of electric capacity is restored quickly, for some ten or fifteen minutes. The line current is reduced, and further the charge is delayed.
One of the common causes leading to failure of washing machines “Vyatka-automatic”, is the failure of motor windings (ED) the drive command device. In repair shops usually eliminate this problem by replacing. And I prefer not to deal with blown cheap update windings and not even with “soundriver” motor, and with expensive command device (SC), in which all of this is not subject to disassembly “monolith”.
Generators of low frequency oscillations, as is known, can be used as a caretaker: intermittent loud noises warn of the approach of a stranger. On the same principle and made our “Keeper”. It is assembled on the transistor T1 and the transformer TR1 (Fig. 1). Load — the loudspeaker TP1. The chain of positive feedback R1, R2, R3, R4, C1 provides periodic self-excitation of the generator.
I remember a few years ago in the journal “modelist-Konstruktor” there is the material possibility of measuring electrical capacitance using a PC “Specialist”. Then published the program in machine code that allows with reasonable accuracy to determine the values of capacitors in the range of 0.1—1000 UF, and later version of it written in forth language, for which the wording, of course, a huge thank you!
“Dear edition! In rooms 11 and 12 your magazine from 1973 published a description of the guitar in Leningrad designers and lovers Guzina O. and D. Med, hex. The tool we liked.
The process of establishing electronic circuits the most exciting and interesting, but also the longest, sometimes bringing a lot of grief for Amateurs due to the lack of reliable power supply. After all, the battery or the battery do not serve indefinitely — they are discharged. Changes frequently and the line voltage. And each scheme is designed for a specific voltage. Changing it degrades the operation of the entire electronic device.
Without pretending to any special built in circuitry to use a more graceful version of an intercom that can be used as an intercom system in the private house or in the country. The design is simple and available for self-production, even a novice radio enthusiast. In standby mode the device does not consume battery power, but is always ready to work: just touch the button and — please say! Working on the second set you will certainly hear.