Nowadays there are cases of power failure. In such a situation, can save the emergency power supply. For example, from a car battery with a homemade voltage Converter 12/220 V. Saw: stock power is enough for several hours of modern television, the lighting of the lamp or other appliance with power up to 100 watts. The maximum current consumption from a battery does not exceed 11,5 A.
In connection with the aggravation of the criminogenic situation in the country is increasing the demand for security devices. In accordance with the laws of the market grows offer electronic guard for every taste (often with a predominance of the most sophisticated circuitry). Representatives of different companies vying to convince you to purchase state of the art microprocessor designs, the caller is automatically its owner to work or service in the attempts of the attackers to disable the security system and break into the safe house (a dacha, garage). Only here the prices “bite”. And where is the guarantee that replicated the electronic trickery you will not find criminal Kulibin?
Professionally working with imported cameras and digital cameras, sometimes have to face the fact, as in the most interesting moment of the shooting suddenly denied regular batteries, which leads to the loss of unique videos and photos. Not wanting to put up with such things, many owners of such equipment have several CD-batteries for fast replacement of “run down” during the filming. But it’s pretty expensive.
Stranded microcable widely used in modern equipment, in particular for the connection of input devices of a type well-known joysticks and other peripherals to computers. With all the variety of requirements such microcables, even desirable, to be thin and flexible, does not cause inconvenience and noise during the work, was not torn and did not break from repeated bending. The latter is especially characteristic of cable lines with a miniature push-button joysticks that are holding.
Almost a quarter of a century are a subscriber of the journal “modelist-Konstruktor”. About the same age are engaged in electric welding apparatus (ESA). Convinced that the most appropriate mass and power “svarochnik” – with a toroidal magnetic core (for example, from a burnt-out electric motor power 3-5 kW). Manufacturing technology of such devices has been maintained in the pages of “Modeller-designer” (see, in particular, publication in № 8’92, 11’92, 3’94, 9’94, 1 ’96, 3’96, 8’97, 11’99). From my own experience and practice of other handmade designers, I also believe it is appropriate to emphasize that the idle current from sturdy welding transformer designed for connection to a household 220-volt network should be of the order of 0.5-1 A. If a smaller value of this parameter decreases the power at most – heated magnetic core, and with it the whole of ESA.
Often, in order to work in a range of electrical oscillations of sound frequencies it is necessary to select the same capacitors. This and various or balanced bridge circuits, and is identical (for electrical options) the channels of a stereo or Quad amplifiers…
