Of course, there are so many ways to connect wires. All kinds of terminal blocks are widely known: screw and spring, insulated and not. Nut clamps and piercing clamps are popular. Finally, some people simply do not pay attention to common norms, preferring elementary twists. And one of the most reliable connections is wire crimping.

After crimping, the cores of the wires cannot be disconnected without cutting them, i.e. this is an integral connection. But it does not need maintenance either. The essence of crimping is reduced to the joint deformation of the connecting cores and the crimping sleeve into which these cores are inserted. The sleeve is compressed, deformed, compresses the cores, microroughnesses on the surface of the metal conductors are in mutual engagement, and reliable electrical contact is ensured. But it only seems that everything is so simple ...

One of the tasks performed with the help of photosensors is lighting control. Such schemes are called photorelay, most often it is a simple inclusion of lighting in the dark. For this purpose, a lot of circuits were developed by ham radio operators, here are some of them.

Probably the simplest diagram is shown in the figure. The number of parts in it is small, it will not work less, and the efficiency, read the sensitivity, is quite high.

This is achieved by the fact that transistors VT1 and VT2 are connected according to a composite transistor circuit, also called Darlington circuit. With this inclusion, the gain is equal to the product of the gain of the components of the transistors. In addition, such a circuit provides a high input impedance, which allows you to connect high-impedance signal sources, as shown in the circuit ...

The article describes the prospects for the use of graphene and carbon nanotubes in microelectronics.

Listening to the thoughtful arguments of government officials about the need to develop nanotechnology, one involuntarily marvels at the inconsistency of their actions: funds incomparable with the budget of science are allocated for defense. Moreover, now the money invested in scientific research will allow not only to radically change people's lives, but also come close to solving the problem of human immortality.

Speaking of nanotechnology, the first thing that comes to mind is the discovery of graphene and carbon nanotubes. It is with them that scientists associate a breakthrough in the field of electronics and pharmacology in the 21st century. The creation of quantum computers, signal reading systems at the cellular level, nanorobots for treating the body - this is just a small list of opportunities that open up. Now these opportunities have moved from the realm of fantasy to the field of laboratory development ...

About a common wiring malfunction when there is a phase in the 220 V sockets on both sockets. About why this is happening and why it is dangerous. First-person and a bit informal.

There is one characteristic malfunction of the wiring, which can confuse a novice or inexperienced electrician.

To clarify what I’m talking about, I’ll give a story of one of my friends: “My neighbor comes to me on Saturday - my lonely grandmother. And asks to deal with the electrician in the apartment. Say, nothing works, but the lights did not seem to be turned off. Well, I, of course, go to the site and check the circuit breakers. Everything is in order, all machines are on. I take the indicator: the phase is passing. I go into the apartment to my grandmother, I check the first outlet. The first connector is the “phase”. I check the second connector - also a "phase"! Where are the two phases from? ...

The fact that in electrical engineering it is impossible to directly connect copper and aluminum conductors is not a secret even for many ordinary people who have nothing to do with electrics. On the part of the same inhabitants, professional electricians often ask: “Why?”.

Pochemochki of any age can drive anyone into a dead end. Here is a similar case. A typical professional answer: “Why, why ... Because it will burn. Especially if the current is high. " But this does not always help. Since this is often followed by another question: “Why will it burn? Why does copper with steel not burn, aluminum with steel not burn, and aluminum with copper burn? ” To the last question you can hear different answers. Here are some of them. Aluminum and copper have different coefficients of thermal expansion. When current flows through them, they expand in different ways. ...

A modern motorist is armed with all the benefits of technological progress and most of us no longer remember how to inflate a tire with a hand-held automobile pump or apply and vulcanize a rubber patch on a car camera.

We equalize the pressure in the wheels with a compressor, we clean the interior with a vacuum cleaner, and instead of a lever bent by the letter “si”, we drive the jack with a screwdriver with a metal hook clamped into the cartridge. But all the countless electric assistants of the motorist eat electricity, so we strain our car in the garage, forcing it to work for a long time on the cigarette lighter socket to the detriment of the environment and our wallet.

Need a garage power supply: +12 volts, powerful, simple, reliable, safe and versatile. +12 volts (and preferably 12 - 15 volts) - the voltage of the vehicle's on-board network and the operating voltage of its countless accessories ...

The history of the X10 communications protocol dates back nearly four decades. It was developed back in 1975 by Pico Electronics and quickly gained the status of the de facto standard. This happened thanks to the ingenious engineering solution: to use the electrical wiring of the house to transmit control signals.

The idea was developed in industrial PLC modems, which are used today to transfer data from electric meters through power wiring. An example is the Mercury counters of the Incotex Moscow company. But, unlike its ancestor, this data transfer protocol is closed because it uses a proprietary data encoding algorithm to achieve high noise immunity. Today, there are dozens, if not hundreds, of companies that produce products compatible with the X10 protocol, and Chinese home automation product manufacturers have been added to them ...

To an uninitiated person, such a question may even seem strange. How could the idea of ​​using 12-volt luminaires and lamps in residential premises be born when the standard for household voltage in our country is 220 volts? Let's try to figure it out.

First of all, 12 volts is an ultra-low voltage, which is considered conditionally safe for human life and health. For this reason, in rooms with a high or increased degree of danger, the use of 12-volt lamps is welcomed by the rules of PUE.

Bathroom, kitchen, outdoor courtyard - these are the places in which low-voltage lighting has always been preferable. And in cramped and damp basements, it is completely impossible to operate a 220 volt network, and it is mandatory to install a step-down transformer even to power portable power consumers. 12 volt wiring does not require ...