Love to collect basic and necessary household appliances. One of them is the homemade probe, which is designed not only for “continuity” of the electrical circuits in the range of 5-300 In, but also to determine the type, polarity, electric current, measure the voltage from 5 to 60 V — stand on the court readers of the respected journal. The basis of the device is a transistor analogue of the thyristor, addressed at length in “Modelis-the-designer” №1, 1999.
Sometimes even reliable drill goes down. Statistics show that failures occur not so much in its mechanical, how many electrical parts. But if tips on restoration of cable, replacement of worn brushes, bad switch or the elimination of other simple malfunctions of home appliances posted a lot, including in the pages of “Modeller-designer” (see for example, № 9’95,6’96,2’97), what about more complex kinds of repair are not. In particular, there is a clear lack of material about the peculiarities of maintenance and feasible (in terms of home Studio) fixation of the rotor manifold of the engine, usually installed in the drills, wrenches and other manual tools.
It is known that the temperature of the soldering iron depends largely on the quality of the performed installation. Are particularly bad (if not harmful) to overheat. Immediately deteriorating the quality of the soldering, there is a risk of peeling the printed wire Board, is accelerated wear of the operating rod, and even failure of the heating element. Sting often cleaned of oxides and overheated — not holding solder.
For feeding low-voltage soldering iron from a household outlet uses simple adapters, which are, as a rule, the quenching capacitance (capacitor for a specific value). However, the use of such a device for installation of equipment with microprocessors, field-effect transistors and other electronic components afraid of static electricity is undesirable. Too high risk of breakdown due to the direct connection of the heating element with electricity of high voltage. Need galvanic isolation. For example, in the form of a step-down transformer.
Regardless of large or small cans sprung a leak – plastic or metal – it can do a lot more to serve, but in an unexpected quality: the role of the spray device for irrigation of green lawns, flower beds or vegetable crops. This appeared to have cans undesirable hole large enough to add lots of small, turning it into a kind of shower head, and bring a water hose.
Any gardener knows that watering flower beds need warm water and therefore an indispensable attribute of the summer residents are steel drums. When they are new, wherever you went, and when they rust, they are destined to become scrap metal. But few people realize that there is another, more rational and essentially free way to create an almost “eternal” storage of warm water – the tires of heavy wheeled tractors, which are in abundance lying around in many places. Better – from “Kirovtsa”. For this you need to make a bed of fine gravel (about 5 mm). Then to close it with plastic wrap (for sealing the seam) and press down the top cover, pre-cutting the cord until its upper edge.
For students of the 70-ies – 80-ies there was a special annual period, which was called simply “potato.” All through September and sometimes early October, students performed in the suburbs, working in the fields and harvest the potatoes.
Extraordinary time and an amazing event not only shaped the young student groups, but also allowed to learn from the experience and ingenuity of the rural artisans, that is, without going to the potato field. I want to tell you about one unusual device that made the tractor, teaching students to literally stalk your tractor. Course development and he was the highest.
Dear editors, in your journal often publishes interesting technical solutions; offer you. Adhesive pen after consuming the content is not just packaging, and the original design for innovation. For example, it can be easily converted into a syringe-dispenser for viscous compounds: epoxide resin, petroleum jelly, grease, grease nitrokey and other materials.
The device to prevent theft in large and small retail outlets, according to many experts, are the most reliable among all types of protection systems applied in practice. Outwardly, they look like two open valves “gate” installed in parallel (photo 1). The device do have a greater probability of determining the anti-Krasnoy label (due to extremely high power pulses supplied to the antenna). However, the pulses of these devices have a negative impact on human health (with frequent and prolonged exposure), mainly due to their high power.
