Power supplies. Schemes, articles of the Free Technical Library

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Power supplies. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Power Supplies

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Automotive Lead Acid Battery Charger

Section Car. Batteries, chargers. This scheme allows you to automatically charge car batteries. The charging current through the battery, depending on the voltage on it (applied to the B-E junction VT1), is regulated by the transistor VT1, the collector voltage of which controls the charge indicator on the LED (as it charges, the charge current decreases and the LED gradually goes out) and a powerful composite transistor containing VT2, VT3, VT4. Resistor R3 limits the maximum charging current, so it must be powerful enough, at least 10 W, probably better than wire ... >>

Minimum operating voltage indicator

Section Measuring technology. Below is a diagram of a simple minimum operating voltage indicator. The circuit is easy to manufacture, low current consumption. Operating voltage 6-24 Volts. Current consumption without indication (standby mode: 60-240 mkA) and in indication mode: 1.5-6 mA ... >>

Fire and security alarm systems (OPS)

Electrical section. For a clearer idea of the principles of operation of the fire and security alarm system of the OPS, below are elementary schemes of the security and fire alarm that give an audible or light signal in the event of a fire or unauthorized entry to an object. In burglar alarms, as a rule, make or break electrical contacts are used. The type of sensors where the electrical circuit is closed or opened mechanically includes wire loops, magnetic switches, mechanical switches, etc. A number of such circuits are associated with a control device ... >>

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Articles on power supplies

Articles on power supplies; power supply circuits; power supply descriptions: 404 articles

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Latest news of science and technology, new electronics:

Artificial leather for touch emulation 15.04.2024

In a modern technology world where distance is becoming increasingly commonplace, maintaining connection and a sense of closeness is important. Recent developments in artificial skin by German scientists from Saarland University represent a new era in virtual interactions. German researchers from Saarland University have developed ultra-thin films that can transmit the sensation of touch over a distance. This cutting-edge technology provides new opportunities for virtual communication, especially for those who find themselves far from their loved ones. The ultra-thin films developed by the researchers, just 50 micrometers thick, can be integrated into textiles and worn like a second skin. These films act as sensors that recognize tactile signals from mom or dad, and as actuators that transmit these movements to the baby. Parents' touch to the fabric activates sensors that react to pressure and deform the ultra-thin film. This ... >>

Petgugu Global cat litter 15.04.2024

Taking care of pets can often be a challenge, especially when it comes to keeping your home clean. A new interesting solution from the Petgugu Global startup has been presented, which will make life easier for cat owners and help them keep their home perfectly clean and tidy. Startup Petgugu Global has unveiled a unique cat toilet that can automatically flush feces, keeping your home clean and fresh. This innovative device is equipped with various smart sensors that monitor your pet's toilet activity and activate to automatically clean after use. The device connects to the sewer system and ensures efficient waste removal without the need for intervention from the owner. Additionally, the toilet has a large flushable storage capacity, making it ideal for multi-cat households. The Petgugu cat litter bowl is designed for use with water-soluble litters and offers a range of additional ... >>

The attractiveness of caring men 14.04.2024

The stereotype that women prefer "bad boys" has long been widespread. However, recent research conducted by British scientists from Monash University offers a new perspective on this issue. They looked at how women responded to men's emotional responsibility and willingness to help others. The study's findings could change our understanding of what makes men attractive to women. A study conducted by scientists from Monash University leads to new findings about men's attractiveness to women. In the experiment, women were shown photographs of men with brief stories about their behavior in various situations, including their reaction to an encounter with a homeless person. Some of the men ignored the homeless man, while others helped him, such as buying him food. A study found that men who showed empathy and kindness were more attractive to women compared to men who showed empathy and kindness. ... >>

Random news from the Archive

Ear plugs in the nose for those who want to lose weight 04.06.2018

Israeli doctors from the Hasharon hospital in Petah Tikva have created a device that helps a person lose weight by depriving him of the ability to smell food. Experiments have shown that if a person does not smell, it deprives him of cravings for sweets.

According to WHO, since the 80s, there has been a global epidemic of obesity in the world. Last year, every third inhabitant of the Earth, a total of 1,9 billion people, suffered from excess weight, while approximately 15% - from severe forms of obesity. As noted in the organization, 47 percent of diseases - for example, heart problems, diabetes and cancer - are associated with obesity.

In recent years, scientists have begun to increasingly talk about the fact that obesity and chronic inflammatory processes are interrelated. The appearance of extra pounds leads to the development of foci of inflammation in the body, which, in turn, contributes to even greater weight gain. Biologists have found that inflammation-suppressing substances such as capsaicin, the main component of the hot taste of peppers, have proven to be effective drugs for obesity. Many of these molecules are currently undergoing clinical and preclinical trials.

Dicker and colleagues offer a simpler solution to weight problems. Analyzing the prevalence of obesity among different population groups, scientists drew attention to the fact that people aged 50 years and older are much less likely to suffer from obesity than those under 50, despite similar diet and lifestyle habits. Around this age, a person's sense of smell begins to gradually deteriorate, which can affect how appetizing they find an extra serving of food.

Scientists tested this idea by making some kind of "plugs" of silicone that let air through, but prevented odors from freely penetrating into the nose of their owner. They tested their work on a group of six dozen volunteers, half of whom received bogus nose drops that supposedly helped them lose weight.

Before the start of the experiment, the researchers measured the usual amount of food consumed by their subjects, and asked them to reduce the daily amount of calories by about 500 units. Every few weeks, the researchers gathered volunteers and measured the levels of fat, insulin and other important molecules in their blood and noted their progress towards weight loss.

As these observations showed, such plugs actually helped the subjects lose weight and change their diet - on average, their weight decreased by eight percent over several months of the experiment, which is about twice as much as in the control group. Similarly, the concentration of insulin in the blood, blood pressure and cravings for sweets decreased.

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