Security and alarm system via mobile communication. Schemes, articles of the Free Technical Library

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Security and alarm via mobile communications. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Security and alarm via mobile communication

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Broadband amplifier on transistor KT3115A

Section Antenna amplifiers. A simple broadband antenna amplifier provides a gain of about 10 dB over the entire range allocated for television broadcasting. The amplifier is a cascade with a common emitter and deep negative feedback through R1 C2, as well as emitter correction R5 R6 C5 Sat. The amplifier is powered via cable. The anti-parasitic circuit R4 C3 ensures the stability of the antenna amplifier at high SWR in the cable, which is possible when the input impedance of the TV differs significantly from the characteristic impedance of the cable ... >>

VHF - FM stereo tuner 60-108 MHz on the TDA7021T chip

Section Radio reception. L1 - 8 turns, L2 - 13 turns of wire with a diameter of 0,55 mm, winding without a frame, on a mandrel with a diameter of 3 mm. L1 determines the received range, L2 is the input circuit, trimmer - stereo signal capture ... >>

Another life of the LPT port. Part 1

Section Electronics and computer. The parallel port for communicating with a printer (or other device) has a base address of &H378 (LPT1), &H278 (LPT2), &H3BC (LPT3). In this article, we will consider only LPT1. The address space of this port occupies the range &H378-&H37F ... >>

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Articles on security and signaling via mobile communications

Articles on security and signaling through mobile communications; diagrams of GSM security and signaling devices; descriptions of GSM security and signaling devices: 10 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

Canon i80 inkjet printer 12.03.2004

In Europe, the successor to the Canon i70, i80, was launched for sale, which can be used not only as a stationary small-sized office equipment, but also as a portable one, thanks to its reduced size compared to its predecessor, as well as the standard and optional features provided for this.

Characteristics of the printer: optional - lithium-ion battery (LB-51) for autonomous power supply; direct network connection via PictBridge or Jet Direct; optional cigarette lighter charger (PU-100U); print resolution - up to 4800x1200 dpi; print speed: in color - up to 10 ppm, black and white - 14 ppm; interfaces: IrDA and USB 1.1 - standard, Bluetooth 1.1 - option (BU-10); tray for 30 pages; compatible with Mac (USB) and Windows 98/ME/2000/XP; dimensions - 310x174x51,8 mm; weight - 1,8 kg. The price is about 240 euros.

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