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Knots of amateur radio equipment. Schemes, articles, descriptions
Free library / Schemes of radio-electronic and electrical devices
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AC adapter for CB radio
Section Civil radio communications. CB radio stations that have appeared on our market are designed, as a rule, to be powered by 10 ... 12-volt batteries. The current consumed by such a station in the receive mode is 0,02 ... 0,3 A
Red or green? (the game)
Section Beginner radio amateur. This can be conditionally called a slot machine, the scheme of which is shown in Fig. 1. It is formed by a generator of rectangular pulses on logic elements DD1.1 and DD1.2, included by inverters, a JK flip-flop DD2 and transistors VT1 and VT2 with incandescent lamps HLl and HL2 in the collector circuits. The balloon of one of the incandescent lamps is colored red, the other green. How does such a machine work and what is the task of the players? While the contacts of the SB1 button are not closed, the generator generates pulses, the repetition rate of which is determined mainly by the capacitance of the capacitor C1. The capacitance can be in the range of 1000 pF ... 1 uF. Pulses are fed to the input C of the JK-flip-flop DD2 and their downturns change its state to the opposite. The frequency of voltage level changes at the trigger outputs is half the frequency of the generator ... >>
Finely compensated volume control with deep correction
Section Tone and volume controls. The insufficient degree of rise in the frequency response at lower frequencies for the regulators that were discussed is explained by the use of first-order corrective circuits. In the TRG shown in the figure below, the depth of correction at low volume is increased by introducing the R4C3 circuit, which, together with the section of the variable resistor from the engine to the tap, forms a second frequency-dependent divider ... >>
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Articles on the nodes of amateur radio equipment
Generators, heterodynes
Articles on generators, heterodynes; circuits of generators, local oscillators; descriptions of generators, local oscillators: 100 articles
Quartz filters
Articles on quartz filters; circuits of quartz filters; descriptions of quartz filters: 10 articles
Modulators
Articles on modulators; modulator circuits; descriptions of modulators: 8 articles
Signal limiters, compressors
Articles on signal limiters, compressors; circuits of signal limiters, compressors; descriptions of signal limiters, compressors: 3 articles
Mixers, frequency converters
Articles on mixers, frequency converters; schemes of mixers, frequency converters; descriptions of mixers, frequency converters: 10 articles
Filters and matching devices
Articles on filters and matching devices; schemes of filters and matching devices; descriptions of filters and matching devices: 49 articles
Miscellanea
Articles on the nodes of amateur radio equipment; diagrams of various components of amateur radio equipment; descriptions of various components of amateur radio equipment: 38 articles
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 Touch for robots
09.05.2013
Scientists at Georgia Tech have created piezoelectric transistors that can create a tactile image. Simply put, it is a flexible plastic, similar to paper lamination plastic, that will allow robots to "feel" touches on various objects.
The new material consists of bundles of vertical nanowires made of zinc oxide. An array of nanowires is capable of converting pressure (from impact, touch, etc.) directly into electronic control signals. This will provide a realistic sense of touch for prostheses or robots designed for the smallest manipulations, such as surgery or interaction with people.
The scientists are currently testing the material with an array of more than 8000 piezoelectric transistors, each of which can independently generate an electronic control signal in response to mechanical stress.
These sensory transistors, called taxels, have high resolution and sensitivity comparable to that of a human finger. Until now, there have been no such advanced haptic systems, and developers are waiting for a real breakthrough in robotics.
Vertically aligned taxels work with bipolar transistors, which, unlike conventional transistors, control current through a special effect: electrical charges are generated at the Schottky barrier by piezoelectric nanowires. The 234 ppi taxel array has a resolution of over 100 microns and can detect pressure changes of about 10 kPa, which is comparable to the sensitivity of human skin.
A new material is made relatively easy: by chemical growth at a temperature of 85-90 degrees Celsius. Taxels consist of bundles assembled from about 1500 individual nanowires ranging in diameter from 500 to 600 nanometers.
The new material will undoubtedly find wide application in various fields: from fingerprint scanners and touch screens in smartphones to remote control systems for spacecraft and surgical robots.
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