Of course, thyristor power switches in household appliances is very compact and convenient, but… КУ201, КУ202 and familiar to all cheap copies, unfortunately, tend unjustly to fail. Failsafe only thyristors for industrial use (TL), but they are quite expensive and overall. Besides working, for example, an electric heater thyristor (triac-like) inclusion creates in radios and tape recorders unpleasant 100-Hertz background. So sometimes you have to go back to the old, but tried and tested method on a powerful load through the contacts of electromagnetic relays.
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For the computer control various devices and objects I propose to use the method of pulse width modulation (PWM) is equally successful when working with different PCs: Intel-80286 to Pentium latest modifications. Perhaps, the only condition — the presence of a free com port. The relationship with him is up to 200 m can even be done through conventional telephone wires, no protection against the electromagnetic effects of the environment. In the transition to the more sophisticated, shielded lines of the “range” computer control with PWM increases.
To reduce the ripple in the filter of the rectifier sometimes try to put the capacitor as much as possible capacity. However, this is not always safe for the semiconductor valves.
(Experience in Windows 9x). In the presentation intentionally does not address questions related to installing OS and the principles of the model of relations with her because of this so much has already been written (plus there are comprehensive, embedded in the process of installing Windows 9x, help system).
It seems that in our country starts to revive the system of renting household appliances. Hence, people with modest incomes the opportunity to use, say, digital photo and video equipment, previously inaccessible because of its cost. But if there is a technique Kodak, Sony or other well-known firms, whether to restrain themselves in the quest to understand: what is it so prized?!
Among the variety of non-contact sensors are the most attractive for developers of motor vehicles, including improvised, turned out to be induction (or generator) — unpretentiousness to external conditions, ease of manufacture and durability. On the basis of “indukcionnye” was created by different devices: from the simple, registered linear motion, to complex, such as the ignition system with digital control, the fuel injection system, anti-lock braking system, brake control, etc.
From experience in Windows 9x. (The end. Beginning in previous issue)
In our city a large traffic, not only on the main streets. And traffic lights are sometimes not on every street corner to cross the street in a place unsafe. Especially if the person is elderly or poor vision. Careless movement can result in an accident.
TWO OPTIONS OF HEATERS FOR AQUARIUMS OFFER OUR READERS. Uniform temperature in the aquarium keeps the water-filled Cycling or any other appropriate size camera. It is placed as shown in the figure.
In the manufacture of models or devices containing frequently unscrews detail, there is often a need to do the knurling (knurled) outer surfaces of the nuts or screw heads. With this purpose usually use a special device consisting of one or two fine teeth hardened rollers in the mandrel. During rotation of the part fixed in the Chuck of the lathe, the teeth of the rollers are pressed into the surface and form therein a corrugation. With the appropriate equipment the operation is not complicated. However, if you want to make knurled at home?