The scheme is simple electronic guard device published the magazine “Funkamateur” (GDR). Across the doors of the protected object stretched thin wire. Until he is whole, the tension on the bases of the transistors VT1—VT3 are few and they are closed. In case of wire break on VT1 through a resistor R2 receives the bias voltage, and this semiconductor device is opened. Now, through a chain of R2—R4, the transistor VT3 will get more offset. Relay K1 will work, and its contact system will include a siren, a buzzer or a lamp. Moreover, the elimination of wire break will not change the situation is to disable the watchdog is possible only with the switch ЅА1.
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Continuously growing speed racing car, top athletes, designers are finding new technical solutions that increase the speed of avtopoligon, new methods of forcing-engines, better ways of suspension. And as a natural result — new records. So, last year, the master of sports of the USSR, Leningrad A. Medvedev at the all-Union competition “Match the fittest” broke the record of the Soviet Union — his polutorametrovy was racing the distance at a speed of 223,880 km/h!
For several years now to paint a variety of products I use simple and reliable “compressor”. A source of compressed air there are two rubber pump-“frogs” to inflate inflatable mattresses, inflatable rubber boats, etc.
Well-lit birch chocks, hot! To heat the furnace with fuel such a pleasure. However, they still need to stock up. And the one who chopped wood knows what it’s like to wave with an axe a few hours, especially with the habit. It is not easy to do the job, and the elderly.
For soldering of carbide inserts on tool holders turning tools, local hardening tool, soldering brazing small parts using heating by high frequency currents or by the flame of a gas burner. However, HDTV equipment bulky and expensive, it is not for the home workshop or school group. Use the gas burner all the rules can only welder qualifications.
Today, we first introduce you to the most massive representatives of the ship-class F1-V. This high-speed RC ships with engines working volume of 10 to 15 cm3. One of the most successful developments in this subclass is the model A. Baidebekova.
Villages without running water now, a little, but his presence in every rural home is rare: still dominated by collective hydrant.
Inaccessible part of kitchen table will be within reach if the shelves are in it to make a semi-circular and rotating.
