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LG Shows DukeBox Audio System with Tube Subwoofer and Transparent OLED Display – Image & Sound – News

However, this is not true. Tube amplifiers tend to produce second-order tones and are certainly not linear. It is often experienced as fun.

The most technically perfect amplifier is the Class A amplifier. It is also very easy to make with just a few components. However, Class A is so energy-wasting that no one would build a powerful Class A, and the amplifier would need massive heatsinks.

Class B features a design with a transistor at the output stage to supply and remove power and is considerably more economical, but suffers from a weak point when one transistor has to replace another.

Class A/B (popular from 1970s to 1990s): A modification of Class B by making both transistors connected near the transfer point. Since both transistors are conductive, some power is wasted (converted directly to heat rather than powering the amplifier), but the transfer point problem is largely solved.

Class D (popular since the 1990s): They are no longer a transistor that generates a DC voltage, but rather MOSFETs that turn on or off. Pulse width modulation and a low-pass filter convert it into a continuous signal again. Class D amplifiers also have a weak point at the transfer point from source MOSFET to drain MOSFET, as turning both on at the same time means a short circuit occurs, so the amplifier introduces a dead moment. Specifically, since turning both on at the same time means a short circuit, the A/B trick of energizing both for a short time is not possible.

Class D is very economical and can therefore be manufactured in small chips, and is therefore very popular in modern electronics.

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[Reactie gewijzigd door dmantione op 2 januari 2024 21:05]