Hams know how sometimes when soldering they do not have a third hand to fix a small detail. At the time it was proposed many devices that can help in such a situation (see, for example, the magazine “modelist-Konstruktor” No. 10’1996). In particular, I use a fixture, which is made in just a few seconds.“THIRD HAND” TWEEZERS
Hams know how sometimes when soldering they do not have a third hand to fix a small detail. At the time it was proposed many devices that can help in such a situation (see, for example, the magazine “modelist-Konstruktor” No. 10’1996). In particular, I use a fixture, which is made in just a few seconds.
Informing about the occurrence of an event, people often use sound signals. Usually they have the character of a continuous sound “one note” annoying “beep-beep” or howling siren with a periodically varying frequency. Generators of electric vibrations, producing these signals is also straightforward. They are based on one-two multivibrators, which makes the structure very simple, accessible to even beginners repetition hams.
Who used a portable transistor radio, know how, over time, decrease the sensitivity and loudness of the radio, begins to “float” the rate of advance of the tape in the music player…
Electricity is steadily going up. So now even avid spenders are forced to take care of her savings, the benefit — there is a very wide selection of devices designed to save valuable kilowatt hours. Its rightful place is here and homemade machines off “extra” loads. It is gratifying that among the most interesting of them — the development receiving a “ticket to life” in the pages of “Modeller-designer” (see, for example, publications in № 4’89, 6’91, 9’92, 1’95, 7’2001 of the journal).
Summer — time for vacation and travel. During this period, there is a special need for a universal power supply for various mobile (and not only) household appliances.
As a result of scientific-technical progress increases the degree of integration of integrated circuits (MS), including working in a permanent storage device (ROM). The developers of the micro-computer it is possible to use MS’s permanent memory with a larger capacity, thereby increasing the reliability of the computer while decreasing its size and power consumption. However, Amateur radio operators (especially in remote rural areas), this progress is often not happy. The reason is simple: cutting-edge MS from them or not at all, or they are, but beyond available to the programmer.
Seed stations and seed agro-laboratories often calculate “manual. Manual labor is unproductive and tedious, especially if you need to count a large number of seeds. Counting on 10 thousand grains of wheat takes about three hours. And to make a mistake during manual account easily. However, this operation can be replaced by a method of weighing, but due to the difference in sizes of the seeds of error in this case reaches 30%.
A lot of interesting instruments created in radio school of the Gomel Palace of pioneers and schoolchildren named after V. I. Lenin. Here are some of them: pulse the flash and the instrument for testing high-power transistors developed by members of the group Valery Denisenko and Sergey Skruzny.
Analog IC К176ХА10 was developed as a combined that contains a standard power amplifier of sound frequency (umzch) and has long been undertaken by radio Amateurs on Board. With supply voltage 9 In it has an output of 0.7 W at the output, but… recommended by the manufacturers the option to include К176ХА10 has impressive size and value (with the condition playlist “bass”) is the oxide capacitor, the reliability of which by modern standards is poor.
For more than ten years, using a homemade device proved during welding, cutting metal sheets with thickness from 0.6 to 12 mm, the power at the time of starting the engine of a motor vehicle starter, charging alkaline and acid batteries, starting and subsequent operation of the DC motor power up to 1.5 kW. Moreover, I represent the universal — it is also an excellent source of safe voltage for electrical equipment, cellar, basement, workshop…