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?
FOR WATCHMEN — PHONE CALL
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.
In the journal “modelist-Konstruktor” No. 10 for the year 1985 was published a description of the electronic disconnect switch (VMS) for the battery (AB) of the vehicle. The originality and simplicity of the scheme I liked. Of course, I used it on my car. And creatively. The result is a design which, unlike the prototype, allows you to successfully use e-VM even when the on-Board network contingencies of a short circuit. In addition, my design provides for the on indicator. But this added convenience.
The brake light is on every car. However, the day (and especially during Sunny weather), the light becomes less visible. My suggestion is to use for signaling braking and still the Parking lights (so much so that at dusk and at night, they automatically would go to work in the usual, regular mode). For this customization requires minimal intervention in the scheme of the onboard network of the car, and here is the result… In its high efficiency will make sure everyone who is brought to follow the car, stop signal, in which the day is highlighted by a “retrained diodes dimensions”.
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…
Five years ago one of my friends purchased a garage with a cellar and worried about how and what to do to potatoes and other vegetables, planted for winter storage in the cellar, didn’t freeze? Remember, rescued his once-popular thermostat through a balanced bridge with the two thermistors. And recently another friend of mine, being in the same life situation, asked me to help him in the manufacture of such devices.
Unfortunately, the real service life of bulbs and shades in lightly places their exploitation is often not as long lasting as I would like. Break the bullies, twisting the bottom-feeders of public (and, say, neutral) property. A lack of control and lack of adequate measures of protection to contribute.