The article provides lighting control circuits using walk-through and cross switches, bistable relays, dimmers, dimmers, photorelay, timers and infrared motion sensors.

Lighting control schemes have already been repeatedly considered in the literature and on the pages of various Internet sites of electrical orientation. Therefore, here we will try to outline the various existing solutions.

The simplest control schemes for a one- or two-key switch are known to everyone and, therefore, few people are interested, so we will immediately proceed to consider lighting control schemes from several places.

Let's start with a specific simple situation - let's say you have two floors in a country house. In the evening you climb the stairs to the second floor. Naturally, you need to turn on the lights on the stairs. Turn on on the ground floor. We rise to the second floor...

A simple circuit for determining short “dips” in mains voltage.

Everyone knows about the low quality of domestic energy supply, and a lot has been said about it. Instead of a voltage tolerance of +/- 10 percent, which is 180 ... 240 V, the mains voltage can "float" in the range of 160 ... 260 and more V.

Such slow voltage changes are quite successfully handled by AC voltage stabilizers based on autotransformers, for example, Resanta. Such stabilizers are designed mainly for such equipment as a refrigerator, washing machine, electric stove.

Modern electronic household equipment does not require such stabilizers, since all voltage stabilization is carried out, as a rule, by internal semiconductor stabilizers ...

The time has long passed when the voltage in the network was more or less stable, and amounted to 220 V + - 3-5%. In the realities of today's life.

The voltage, depending on the region of residence, can fluctuate in very large limits. Anyone who is even a little familiar with power grids knows that the further the facility, in this case your house, is from the transformer substation, the greater the voltage drop.

For most electrical appliances, both overvoltage and undervoltage are dangerous, many electrical appliances will simply not turn on or fail. Only devices capable of regulating voltage can help in this situation. Such devices are called voltage stabilizers ...

The article explains how to remake a conventional computer power supply for a voltage of 24 volts.

In some cases, there is a need for powerful power supplies for various equipment, designed for a voltage of 24 volts.

In this article I will tell you how you can remake a conventional computer power supply both ATX and AT for a voltage of 24 V. Also, from several such blocks, you can compose any voltage to power all kinds of devices.

Alteration is the addition of two power diodes, an inductor and a capacitor ...

Instructions for self-installation of a satellite dish. Using these recommendations, almost anyone will be able to independently install and configure a satellite dish.

In order to install a satellite dish, we need:

1. A set of satellite equipment (receiver, antenna with a diameter of 90 cm, bracket, bracket mounting hardware, universal converter, RG-6 coaxial cable, two F-connectors).

2.Tools: compass, rotary hammer, pliers, screwdriver, wrenches, portable TV, insulation tape, extension cord for connecting to the mains.

This article will describe in detail how to configure a satellite dish to receive a television signal from the Hot Bird 13E satellite, but using this technique, you can configure your satellite dish to other satellites yourself ...

The scheme of a single vibrator and the principle of its operation according to the time diagram.

In the previous part of the article, multivibrators made on the K155LA3 logic chip were described. This story would be incomplete if not to mention one more kind of multivibrator, the so-called single-vibrator.

A single vibrator is a single pulse generator. The logic of his work is as follows: if a short pulse is applied to the input of a single-shot, then a pulse is formed at its output, the duration of which is given by an RC chain.

After this pulse ends, the single-shot goes into the standby state of the next trigger pulse. Because of this, a single vibrator is often called a standby multivibrator. The simplest single-shot circuit ...

Long gone are the days when basements and attics were left empty or, at best, used them as technical rooms, where various communications were installed - sewage, ventilation, heating.

But all the same, there are situations when it is necessary to install wiring in the attics, in basements, cellars. In this article we will try to figure out how to properly install the wiring.

So, before you begin installation, it is necessary to determine what type of premises the basement and attic belong to. Let's start with the basement. Basements belong to rooms with high humidity, therefore, to the wiring in this case, increased demands are made ...

A regulator that supports mains voltage within 190 ... 242 V.

It is known that voltage in domestic power grids often goes beyond tolerance limits. In the days of tube TVs, ferroresonant stabilizers were very common. Modern TVs are operable with changes in input voltage within 110 ... 260 V.

The same can be said about computers, CD players, and generally about all the equipment in which switching power supplies are used. But for equipment that feeds directly from the network, the limits of voltage change are much smaller.

A vivid example of such a technique is a refrigerator, an electric coffee grinder, a food processor, a soldering iron, an incandescent lamp ...