There are various electronic devices to locate hidden wiring. However, at home the need for them arises relatively rarely, when, for example, produce the repair of the apartment or change the interior.
The electronic device described in mi readers, you can install on the toy, equipped with a separate drive for each caterpillar: tank, lunar Rover, Lunokhod. The model moves with headlights on in a darkened room, and set PA her the photodiodes capture the reflection of the headlights from obstacles. The appropriate commands to the drive engines on the basis of the received data takes the logical unit. Here’s how it works.
Small red-hot spiral, fed by electric current, in skilled hands becomes a kind of pencil, which is burned on the tree. This elektrovyzhigatel. For its production you will need a transformer, step-down the voltage to 220 V to 2-4, 1.5—2 m stranded wire (cord), electrical tape, nichrome wire Ø 0,5—0,8 mm with a length of 60-80 mm, wood 30 mm 0 blank or cut of the PCB [plywood] with a thickness of 7-9 mm, screws and M3 nuts, small screws, strips of brass of 1 mm thickness, twine. We offer our readers two versions of elektrovyzhigatel, and each is characterized by simplicity, reliability and safety in operation.
Just 30 minutes will it take to build a simple and reliable time switch that at a given point (in the range of 1-11 h) will switch on or off any home appliance power up to 0.5 kW. The device is made on the basis of a conventional mechanical clock, for example, “amber”, “Sevani”, “Ray”, in a plastic case of which a simple device consisting of two neon lamps T-0,3, a pair of resistors VS-0,25 or MLT-0,5, the micro-switch MP-1, socket for standard plug and fuse.
“Voiced” model tractor, car or locomotive immediately “alive”, if you supply electronic simulator sound. The scheme of the device, imitating the “voice” of the internal combustion engine, printed Yugoslav magazine “Radioamator”.
Equalizers are designed for frequency correction of the playback devices. The scheme of such a device published by the Romanian magazine “Technium”. We are talking about passive bandpass tone corrector, is connected between the two amplifier stages, compensating the loss of gain in the passive circuits. Variable resistors R7 and R5, respectively, lower and adjust the lowest frequency, R10 — medium and potentiometers R13 and R15 — highest and the highest frequency.
If you are tired to constantly change the bulb, use one of the tips below. But in all cases success is achieved through a substantial reduction in voltage. In the daytime and especially at night, the voltage often reaches 230-240 V, which leads to accelerated burnout of the filaments of light bulbs. It is estimated that the excess voltage of only 4% compared to the nominal (i.e., from 220 to 228) shortens the lifespan of the bulbs by 40% and with increased “power” of 6%, this period is reduced by more than half.
To extend the life of bulbs, plug in the power supply circuit is a semiconductor diode that lowers the voltage across the lamp. But where to place it! If this causes you difficulties, install a diode in the base from the blown bulbs. The diode type Д231, Д232, D245, Д246 cut conclusion with threaded and Read more…
“I know, I know— says a reader, after reading the title.— Yes, but neither “alive” nor “dead” water does not happen. Tales!..” Is he right? A few years ago, the magazine “Inventor and rationalizer” announced that we have developed a device that allows you to do “live” and “dead” water. And if you speak the language of chemists, water with a very strong acidic and alkaline reaction. It turned out, ordinary water can be decomposed as two components with opposite properties. According to statements of many who have experienced their actions, “living” water beneficial to the complexion, softens wrinkles, improves hair growth, reduces hair loss, is a good remedy for burns. But “dead” water bad acts on the mouth, reduces gum bleeding.
Many motorists available means, to improve the performance of various components of your machine. Considerable help in providing them electronics. To take at least a variety of electronic ignition system, which “M-K” repeatedly told. Today we offer the owners of “Lada” and “Cossacks” to build a simple electronic voltage regulator (ZRN), constructed in Kharkiv by B. Krutikova.