Audio surveillance, video surveillance. Schemes, articles of the Free Technical Library

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Audio surveillance, video surveillance. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Audio surveillance, video surveillance

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Power supply for multimeter M830

Section Power supplies. The M830 series multimeters require a 9V supply (from a 6F22 battery or similar) to function properly. The multimeter works fine when the voltage drops to 7,5 V. However, when the voltage drops below this value, the measurement accuracy decreases, and at a voltage of less than 6 V, the multimeter is no longer able to measure. To accurately measure parameters with a multimeter, the supply voltage must be constant. To do this, I propose to use well-known SEPIC microcircuits, for example, from Linear Technology ... >>

car radio watchman

Section Security and car alarm. In connection with the growth in the number of cars and the remoteness of garages from apartments, the issue of protecting cars at night in the yards of houses has become relevant. If stealing a car is quite difficult, then removing the emblem, pulling out the radio or battery is not a big deal. Most anti-theft devices only make it harder to start the car's engine, but do not protect against theft of contents. There are devices that respond to swing, the actuating unit of which is a siren or a car signal. At night, they wake up not only the owner, but also the neighbors. Disconnecting the battery completely disables such devices. ... >>

Diagram of remote frequency setting of the transceiver

Section Nodes of amateur radio equipment. Because The PC is not always located next to the transceiver, then DM2AUO proposed a scheme for remotely setting the transceiver frequency. For those who like to work with PSK31, SSTV or FAX, manually setting the frequency is very often a problem, the solution to which can be remote control of the transceiver, independent of the computer. In modern transceivers, the reception and transmission frequencies can be changed in steps of 10 Hz using keys controlled by the Up and Down buttons via the microphone connector. If the buttons are pressed briefly, the frequency changes in steps, and a longer press causes a smooth change in frequency. If the control input of these keys is excited by a sequence of short-term button presses, then a continuous and slow change in frequency can be obtained ... >>

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Articles on audio surveillance, video surveillance

Articles on audio and video surveillance; audio and video surveillance schemes; descriptions of audio and video surveillance: 15 articles

All articles on security devices

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

Winter rain on the weekend 16.12.2008

Spanish meteorologists analyzed rainfall data across Spain from 1961-2004 and concluded that it rained more often on Sundays. From other studies, we know that the same effect is even stronger in the US, China and Japan.

The peculiarity of the Spanish weather is that weekends are more often rainy in winter, and in summer it rains more often in the middle of the week. In addition, Spanish scientists found that air pressure over Western Europe fluctuates in a weekly rhythm: it decreases in the middle of the week, and increases on weekends.

The reasons for the found patterns are not yet clear, but meteorologists suggest that they are associated with the weekly cycle of activity in many industries.

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