Lightning protection. Schemes, articles of the Free Technical Library

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Lightning protection. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Lightning protection

We recommend reading in our Free Technical Library:

Connecting to the antenna of several TV (VHF) receivers

Section Television antennas. On fig. 1 shows antenna matching schemes with several receivers: VHF radios and TVs. The connection to the antenna is made using a standard 75 ohm coaxial cable. Antenna matching with several radio receivers is possible both with the help of fairly simple resistive dividers, and with the help of fairly complex circuits that use RF transformers, RF inductors, etc. ... >>

Preamplifier on the KM551UD2 chip

Section Preamplifiers. The rated input and output voltages of the amplifier are 0,25 and 1 V, respectively, the harmonic coefficient in the frequency range of 20 ... 20000 Hz is not more than 0,02%, the signal-to-noise ratio (unweighted) is 90dB. The range of volume and tone control (at frequencies of 60 and 16000 Hz) is 60 and ±10 dB, respectively, the crosstalk between channels in the frequency range of 100...10000 Hz is at least 50 dB. The input and output impedances of the amplifier are 220 and 3 kΩ, respectively. The circuit is assembled on a KM551UD2 chip. This IC is a dual op-amp with a supply voltage of ±5 to ±16,5 V. An IC with index A differs from a device with index B by half (4V) input common-mode voltage and a normalized noise voltage reduced to the input (no more than 1 μV at signal source resistance of 600 ohms, for KM551UD2B it is not standardized) ... >>

Solders and fluxes. Purpose and definitions

Section Electrical materials. For soldering joints of conductive materials, depending on the maximum permissible operating temperatures and the required strength of the solder joint, soft and hard solders are used. Soft solders include solders with a melting point of up to 400 ° C, and hard solders - over 500 ° C. Solders with temperatures above the melting point of pure tin in the range up to 400 ° C are called semi-solid. Soft and semi-solid solders have a tensile strength of up to 50-70 MPa and are used for soldering current-carrying parts that are not simultaneously the supporting structures of machines or devices ... >>

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Articles on lightning protection

Articles on lightning protection; descriptions of lightning protection devices: 8 articles

All articles for an electrician

Regulatory documentation for an electrician

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

TDA8939TH - class D digital amplifier 22.02.2004

PHILIPS SEMICONDUCTOR Corporation has launched the TDA8939TH class D digital amplifier. It uses the representation of sound through pulse-width modulation.

The microcircuit can develop power up to 140 watts in a load. Scope of application - home theater, DVD receivers, etc.

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