transmitters. Schemes, articles of the Free Technical Library

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Transmitters. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Transmitters

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Car strobe

Section Car. Electronic devices. Firstly, I’ll say that it was made a long time ago (but it still works), because I can miss some details, don’t charge. It runs on battery power, has a tachometer with 2 limits: 6000 and 1500 rpm, they must be adjusted with the appropriate trimmers (for example, by applying pulses from the generator to the input). Some parts of the circuit are taken from the Radio (for input circuits - just an idea), you can also find tuning data there. In particular, a 400V voltage converter from the electronic ignition circuit is drawn below, unfortunately there is no trance data at hand now, I just had such a self-made ignition and I plugged it in ready ... >>

ULF and active band-pass filter on a quad op amp for a direct conversion transceiver

Section Radio reception. Recently, operational amplifiers (op-amps) have been widely used as preliminary stages of ULF receivers and direct conversion transceivers. Such ULFs have a high gain, low noise level and high linearity of the transfer characteristic. The appearance of microcircuits containing several op amps in one package has opened up new opportunities for ULF integration. 1401UD2 also belongs to such microcircuits, which allows you to assemble on it not only amplification stages, but also a filter, which further increases the selectivity of the transceiver. The ULF circuit for a direct conversion transceiver is shown in Fig. 1. Gain stages are assembled on the elements DA1.1, DA1.4, and on the elements OA1.2, DA1.3 - an active fourth-order low-pass filter with a cutoff frequency of about 2,9 kHz ... >>

Economic FET stabilizer, 10-20/9 volts 150 milliamps

Section Voltage stabilizers. The recommended voltage regulator is designed to power high-quality equipment. The use of a field-effect transistor as a regulating transistor (VT1) in it made it possible to supply a reference voltage source (resistor R1, zener diode VD1) and a DC amplifier (operational amplifier DA1) with an output stabilized voltage, and also to weaken to a minimum the connection between the input and the stabilizer (through the drain channel - source of the transistor), which reduced the penetration of input voltage ripples into the load ... >>

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Articles on transmitters

Articles on transmitters; transmitter circuits; descriptions of transmitters: 45 articles

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Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive

Learning ability can be seen in the eyes 08.03.2019

How can you know if the interlocutor understood you? You need to follow his behavior, look at how he reacts to certain stimuli. It is this observation that is the main tool of scientists who study a person's ability to learn and perceive new information. But the authors of a recent study in Italy took a different approach. Studying a person's ability to learn, they did not prioritize his external reactions.

The researchers focused on people's visual-motor behavior - in other words, the movement of their eyes - in anticipation of receiving new information. Thus, they learned to read in the eyes - whether their interlocutor understood or not.

Scientists proceeded from the fact that the influence of previously accumulated knowledge on a person's response to external stimuli is formed under the influence of many factors. These include, for example, sensitivity and the way of deciphering sensory information, the way of making complex decisions. After studying all these factors in interaction with each other, scientists from the Center for Neuroscience Research at the University of Taranto tried to establish behavioral responses that indicate a person’s understanding of what will happen in the following minutes.

The leader of the study, Professor Uri Hasson, shared details of how it went. A group of subjects were seated in front of computers and asked to look at the center of a monitor while figures appeared and disappeared in other parts of the screen. "This happened with a certain frequency, - said Professor Hasson. - And we watched what happens with the eyes of the subjects before the appearance of a particular figure." With the help of sensitive equipment, scientists were able to record the smallest involuntary eye movements that occurred in the rhythm of changing the picture on the screen. Each time before the appearance of a new figure, the eyeball of the subjects moved less than 5 mm. This minimal movement became clearer as the person learned the rhythm of the changing figures on the monitor. It indicates that the brain is preparing in advance for the upcoming event.

Analysis of the obtained data allows obtaining information about a person's ability to learn. The researchers also claim that the method they have applied makes it possible to separately consider the state of mind of a person at the moment preceding the "usual" reaction to the appearance of an external stimulus - verbal or, for example, pressing a button. According to Professor Hason, we are talking only about the first results that need further study. But, according to him, in the future, scientists will be able to determine a person's ability to perceive new information by looking at his eyes. The involuntary eye movements recorded by the researchers are the result of subconscious processes, which makes it possible to reliably judge the forthcoming reaction of the subjects to external stimuli.

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