As you know, galvanic elements, batteries, accumulators and many generators do not have high-efficient, fast trigger protection against short circuits (a short circuit). No its in most sources of the secondary power supply Fuse the fuse, there is not in the bill. First, because the response time, is often absolutely not suitable for modern equipment, instantly reacting to abnormal situations. Second, fuses are one-time protection devices, requiring replacement by a new after his burnout, not everywhere and not always acceptable.
Read more
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).
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.
The durability of even the most modern electronic devices (EEW) is inferior to semiconductor counterparts. In most cases this is due to the emissivity of the cathode. The matter is further complicated by the fact that the diagnostic tool (commercially available instruments for measurement and control of emission current) is, unfortunately, very expensive, difficult to operate, as they contain a “naughty” anode and grid rectifiers, which are designed to create to check the lamp mode is close to the working. The received data are plotted, calculated certain characteristics, and by means of which required parameters.
A commercially available power supply units are Chinese — made adapters have several advantages: they have an attractive modern design; dimensions distinguished by compactness; the scheme includes step adjustment of the output voltage based on the “razgovornoy” load; it is also important that there are acceptable for many price. However, they are not without, unfortunately, and specific disadvantage: during operation, they are “kicking”. Annoying piercing buzz with twice the mains frequency, particularly when using paired with a player or radio.
Electronic games with liquid crystals (especially “Nu, pogodi”) children love and appreciate. The disappearance of the “multisignal” a pair of WOLF-HARE “pocket” of the screen is perceived yet children sometimes worse than all misery. And who, if not us, adults (and even more so — consider themselves Amateurs with experience), not to please the younger generation quickly repaired electronic game.
To connect to network various electrical household appliances, machines in homes and apartments provided for the outlet. In the utility premises, outhouses and household buildings when posting back lighting outlet usually do not put. And this from the point of view of electrical and fire safety, in General, that’s right — there for them no supervision, there can be high humidity, etc., etc..
it Happens that during reception of radio broadcasts in the FM and VHF range are “fading” in the form of a deep suppression of the signal under the influence of a variety of reasons. However, undoubted leadership here is negative “Elektromashina” influence of surrounding objects and person in the immediate vicinity of the receiver, the directivity pattern or beam whip antenna.
There are electric circuits of high voltage sources for aeroionizatora, which are collected on the basis of the automotive ignition coil. They are all quite simple and easily repeatable. However, the cost of the ignition coil is very high.
Currently, it has become fashionable household electrical lamps with shades. The publication describes this decoration to the lamp, which is easy to do it yourself from simple materials.