preamplifiers. Schemes, articles of the Free Technical Library

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preamplifiers. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Preamplifiers

We recommend reading in our Free Technical Library:

A variant of the VHF receiver control unit with a frequency synthesizer on the LM7001 chip

VHF Antenna Section. Descriptions of VHF FM radio receivers with frequency synthesizers and LED or LCD indicators are published in Radio [1, 2]. The control unit of these radio receivers can be simplified and its efficiency increased if a pointer measuring device is used to indicate the frequency, and only a mechanical encoder is used from the controls. This set of components is sufficient to provide frequency tuning over the entire range, and to estimate the frequency on the indicator using the proportional deviation of the arrow. Practice has shown that this method of control and indication is quite attractive and convenient. ... >>

Transformerless voltage converter, 28/150-450 volts 1 watt

Section Voltage converters, rectifiers, inverters. On fig. 4.30 is a schematic diagram of a simple voltage converter used to power gas discharge indicators in a digital measuring instrument. With it, you can get an output voltage in the range of 150 ... 450 V at a power of about 1 watt. Converter efficiency is approximately 75% ... >>

Beginner radio mechanic

Section Ham Radio Technologies. You decided to repair the equipment and earn a piece of bread for yourself. Think well - repair is a difficult and thankless task. You will earn money for bread, and maybe even with butter over time, but definitely not for caviar. This is not the business. Well, we'll fix it well. The first thing you can't do without is a soldering iron. We choose a 25-watt soldering iron - we will repair electronics. Although in the future, you may also need 40,75 and 100 watts - you will get it as the need arises. Each soldering iron has its own task - and from this we proceed. Yes, soldering irons with a step-down transformer are very good - that's what I recommend. It is advisable to pick up with a replaceable sting - in my practice, you grind off the sting faster, forming a flat area than the winding burns out. Next, you need a tester. Any chain will do ... >>

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Articles on preamplifiers

Articles on preamplifiers; preamplifier circuits; preamplifier descriptions: 26 articles

Articles on power amplifiers

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

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Random news from the Archive

Allergy to people 10.05.2002

As you know, people are quite common allergy to dogs and cats. But Scottish veterinarians have recently discovered that pets can also suffer from human allergies.

According to their data, about one in twenty cats or dogs are allergic to their owners. Dandruff or microscopic flakes of flaky human skin can cause rashes or skin irritation in animals.

A sure sign of allergies - these symptoms disappear when the owner is away. In addition, it is possible to suspect an allergy to the host in cases where the animal constantly itches, but there are no fleas on it.

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