Nowadays, photosensors are most often used to control lighting on the street and the territory adjacent to the house. (fromtwilight switches).

The photosensors turn on the light depending on the amount of natural light. Somehow it turned out that everyone had forgotten a little the most popular technical solution relative to the recent past - turning the lights on and off using the daily time switch.

Even before the advent of photoresistors and other photocells, various automatic devices with clockwork were actively used to automate lighting. These devices turned on and off the lights at a predetermined time of day. The principle of operation of these relays was based on the rotation of a software disk with holes ...

How to turn on the thyristor? Turn on the thyristor with direct current.

To answer this question you will have to assemble a simple schematic shown in the figure. 1. After the circuit is assembled, it should be connected to a constant voltage source.

The variable resistor R2 motor should be set to the lower position in the diagram. Then, while holding down the SB1 button, (the light should not still be on), slowly move the slider upwards in the diagram.

In some position of the engine, the lamp will light up, after which the button should be released, thereby removing the signal from the UE. After releasing the button, the light should remain on. How can all this be explained? By rotating the resistor R2 engine, we increased the current ...

The first fluorescent lamps were created in the USA in the 30s of the last century. Their active implementation began in the 50s and 60s. Currently, fluorescent lamps in their distribution occupy the second place in the world after incandescent lamps.

One of the main disadvantages of conventional linear fluorescent lamps is their size. Manufacturers of fluorescent lamps have always sought to reduce their size. And only in the 80s after the creation of new high-quality phosphors it was possible to reduce the diameter of the lamp tube to 12 mm and bent it many times to get a lamp with a compact design. Over time, lamp manufacturers managed to reduce their size and weight so much that they became able to replace incandescent lamps almost everywhere. So a compact fluorescent lamp was born ...

Overview of different types of circuit breakers with prices and features

Circuit breakers are present in any modern building, usually they are mounted on a 35mm DIN rail. The exception is the previously widely used black “automatic machines” of the AE series, which are now better not to use, because they are inferior to modern in all respects except the price.

Circuit breakers (automatic machines) are devices for protecting electrical circuits from overloads and short circuit currents.

A critical situation in the electrical circuit occurs when the load is too powerful, or during a short circuit. To understand how the circuit breaker saves in these situations, you need to understand its principle of operation. When the current in the circuit of the machine exceeds the working one by a factor of several, the thermal release is activated ...

After the device and the use of the dynistor have been considered, it will be easier to understand the device and the operation of the trinistor. However, most often the trinistor is simply called a thyristor, somehow more familiar.

The device triode thyristor (trinistor) shown in the figure.In the figure, everything is shown in sufficient detail and in general, with the exception of the other case, it resembles a dinistor device. The connection diagram of the load and the battery is the same as that of the dinistor.

In both cases, the power source is conventionally shown as a battery in order to see the polarity of the connection. The only new element in this figure is the UE control electrode connected, as already mentioned, to one of the regions of the “layered” semiconductor crystal ...

The article describes the use of thyristors, provides simple and illustrative experiments to study the principles of their operation. Practical instructions for checking and selecting thyristors are also given.

The articles “Dimmers: device, varieties and connection methods” and “Device and circuit of a dimmer” described the use of industrial dimmers. But, despite the variety and availability of such devices on sale, sometimes still, you have to remember the forgotten old, and assemble the dimmer according to a fairly simple amateur scheme.

The power of the device that is on sale may not be enough, or there are simply parts so that they are not stupidly lost, so let there be at least something. In addition, the dimmer does not have to regulate the light at all ...

Laying methods and materials used in open wiring.

RThere are two types of wiring - it is hidden and open. As a rule, hidden wiring is better than open in terms of room design and energy performance, as wires under a layer of plaster are cooled better than outdoors and their routes and junction boxes do not interfere with the arrangement of furniture and equipment.

However, in addition to the advantages, hidden wiring has its drawbacks. This is the need for wall shredding and their subsequent restoration, the complexity of the work performed, construction waste, the need to stop technological processes inside the premises, the complexity of subsequent diagnostics and modernization. Open wiring is often done inside buildings when changing ownership; it is much faster, cheaper, and you can easily add or remove its segments in the future ...

Nowadays, almost everyone can assemble and get at their disposal their independent source of solar-powered electricity (in the scientific literature they are called photovoltaic panels).

Costly equipment is compensated over time by the ability to receive free electricity. It is important that solar panels are an environmentally friendly source of energy. In recent years, prices for photovoltaic panels have dropped tenfold and they continue to decline, which indicates great prospects for their use.

In a classic form, such a source of electricity will consist of the following parts: directly, a solar battery (DC generator), a battery with a charge control device and an inverter ...