Transistor power amplifiers. Schemes, articles of the Free Technical Library

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Transistor power amplifiers. Schemes, articles, descriptions

Free library / Schemes of radio-electronic and electrical devices

Transistor power amplifiers

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Powerful power supply rated for load current up to 10 amps

Section Power supplies. A radio amateur needs a safe 220 V power source, with which he can adjust and test self-assembled electronic devices, as well as repair industrial devices. Such a power source, powered by a 220 V lighting network, must support operation at a load current of up to 10 A and have a backup power supply to ensure uninterrupted operation if necessary. This may be required, for example, in rural areas, when the mains voltage is unstable or periodically switched off. ... >>

Small-sized frequency meter - digital scale on the microcontroller up to 200 MHz with LCD display

Section Microcontrollers. The frequency meter has small dimensions of 65x35x20 mm and fits easily in the palm of your hand. Despite this, it operates in a wide frequency range from 0 to 200 MHz, and can also be used as a digital receiver scale. In digital scale mode, the device works with receivers having IF: 455 kHz, 465 kHz, 500 kHz, 10695 kHz, 10700 kHz, 21000 kHz, 24000 kHz. You can select +IF or -IF. Individual firmware for any other inverter is possible. The basis of the device is a programmable microcontroller AT90S1200-12SI from ATMEL. The controller controls the LCD display HT-1611 and, depending on the installed jumpers, works as a frequency meter or a digital scale. To power the microcircuits, a voltage regulator 78L05 is used, which causes the lower limit of the supply voltage to be at least 7V ... >>

Intercom on the network 220 V

Section Telephony. The use of this type of device justifies itself when negotiating within the same house or neighboring houses, because It is impractical to use a radio station at such distances, and telephones are now paid for by the minute. The principle of operation of these devices is based on the fact that electromagnetic oscillations with a frequency of 10 kHz to 100 kHz can be transmitted through the wires of the electrical network, and they can easily propagate to the nearest transformer ... >>

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Articles on transistor power amplifiers

Articles on transistor power amplifiers, transistor power amplifier circuits, descriptions of transistor power amplifiers: 229 articles

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Random news from the Archive

Eyes heal with light 17.12.2002

As you know, treating yourself to methyl alcohol, you can go blind: unlike ethyl alcohol, methyl alcohol turns into formic acid in the body, which destroys retinal cells.

The Wisconsin Medical College (USA) has found a way to prevent blindness from methyl alcohol. Rats given large doses of this substance go blind in one to two days. But if twice - after 5 and 50 hours after the introduction of alcohol - to illuminate the eyes of the affected rat with infrared light with a wavelength of 670 nanometers, vision is restored by 95 percent. Retinal cells regenerate.

It is believed that some other eye injuries, such as blinding by a laser beam, can be treated in this way.

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