Appeared in stores digital multimeters seriously pressed the usual “switches-instrument Toolkit”. However, expensive components (the battery), and sudden circuit failures limit the possibility of using these multitesters. And in the field-conditions, they are generally unsuitable, as ranked by now outdated “respectable” turnout isometry: danger drop, break, drop solder, the difficulty in retaining “the weight” during the measurements all lead to the loss of an expensive device. Therefore it is better to make a special microtester that meets the stringent requirements of the work in “field” conditions and convenient as a wrist watch. Well base and a “measurement head” of a homemade can, in particular, become familiar to all and accessible indicator of the recording level, is widely used at the time in designs of transistor tape recorders domestic production.
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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..
In school museums or at exhibitions of young artists in the role of a tour guide may carry a tape recorder. Explanatory text in advance is recorded on a magnetic tape. It remains only to choose the right place in the tape and the tape will tell about a particular exhibit. But here’s the problem: no experience to do it sometimes difficult.
The use now many are addicted. Almost PI one radioactive not complete without high quality playback equipment. And the shelves are not empty radiomatinal: the attention of buyers offered a selection of “stereospondyli”.
His good-natured face is loved by children. Especially good “eye” — a bright, green and… crafty. The cat all the time “wink” — his pupils are then compressed, then expand.
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.
Digital multimeter in a new role. Inexpensive digital multimeters M-830В today widely used not only in industry but also in everyday life: for example, to measure the voltage in the network or at the terminals of the battery, the “continuity” of electric circuits. Supplemented with consoles, developed by radio Amateurs, they also find application in the measurement temperature, frequency of rotation of the motor shaft…
Why “multichronic”? Because this welding transformer (CT) has many important additional functions. If in traditional “svarochnik”, which has a magnetic core assembled from P – and sh-shaped plates, sometimes nowhere to squeeze at least one or two auxiliary coil, the proposed torus, a doughnut shaped design of the free space was enough. In the end, he is capable of AC/DC to cook “five”, and batteries to charge and metal melting, feeding safe voltage elektrovyzhigatel in circles “Skilful hands”, and perform a host of other things. Fit even to put the question differently: and what a winding and for what purpose wants to additionally have the user of this ST?!
As in the previously published the console, the installation of its new version is “Welt” printed circuit Board foil fiberglass 83x35x1,5 mm. Used resistors — MLT, the capacitors C1 — C3 — MBM, C4 — C50-12; switch БВ1 — toggle П1Т-1 (or any other, preferably from among small-sized counterparts). Coil 1.1 — call from the telephone or homemade (10,000 turns of PEV-0,08 on a cardboard frame cross-section 12×8 mm with cheeks 21×21 mm, at the distance of 26 mm from each other); its DC resistance is 1.7 kω.
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.