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Lamp power amplifiers. Schemes, articles, descriptions

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Tube Power Amplifiers

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More about power supplies with a quenching capacitor



Section Power supplies. The use of capacitors to step down the voltage supplied to a load from a lighting network has a long history. In the 50s, radio amateurs widely used capacitors in transformerless power supplies for radio receivers, which were connected in series to the filament circuit of radio tubes. This made it possible to eliminate the quenching resistor, which is the source of heating for the entire structure. Recently, there has been a noticeable return of interest in power supplies with a quenching capacitor; in recent publications [1, 2], options for such designs and their calculation are considered in detail. The disadvantage inherent in all such devices without exception - increased danger due to the galvanic connection of the output with the electrical network - is clearly recognized, but allowed based on the literacy and accuracy of the user. However, these deterrents are not enough to keep out of trouble, which is why transformerless devices can have only very limited use. ... >>

Communication cable integrity monitoring device



Section Indicators, detectors, metal detectors. Cable communication lines have their own characteristics. These are a large length of the main line (up to several tens of kilometers), a large number of wires in the cable, the presence of signals with an amplitude of up to several tens of volts in the wires adjacent to the tested one, and seasonal changes in the physical parameters of the communication line. A burglar alarm for a cable is usually performed according to the principle of monitoring the integrity of a loop - a pair of wires, at the end of which a resistor of a certain resistance is connected. When the wires are broken or shorted, the input resistance of the loop changes significantly, which is fixed by the signaling device ... >>

Reversible voltage converter



Section Voltage stabilizers. The proposed device is intended for emergency power supply of volatile electronic devices with low current consumption from a backup source in case of power failure (for example, a generator and an electronic clock pulse counter installed in a car). The converter (see Fig. 4.1) contains a backup battery GB1, a master generator on the elements DD1.1 ... DD1.3, a two-digit counter on D-flip-flops DD2.1, DD2.2, a double four-channel multiplexer DD3 and a capacitive storage divider - capacitors C2 ... C5 ... >>

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Articles on tube power amplifiers

Articles on tube power amplifiers, schemes of tube power amplifiers, descriptions of tube power amplifiers: 72 articles

 


 

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Xbox 360 HD DVD 17.12.2006

The long-awaited addition to the Xbox 360 game console, an external HD DVD drive, has gone on sale in the US.

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By the way, one of the movies (Peter Jackson's King Kong) is included with the HD DVD player for Xbox 360. In addition, the device is equipped with a remote control.

The suggested retail price in US stores is $199,99.

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