Audio amplifier classes, engineering, Other Engineering

Expertsmind.com brings you unique solution in electrical engineering

Audio Amplifier Classes

Class A
The transistor amp conducts for the entire cycle of input signal. The conduction angle is 360 deg. These amps run hot, as the transistors in the power amp are on all the time, but the upside is high sound quality.

Class B
In this amp, the positive and negative halves of the signal are dealt with by different parts of the circuit. The output devices continually switch. These amps run cooler, but the sound quality is not as pure.

Class AB
These amps work by biasing the transistor amp at a non-zero DC current much smaller than the peek current of the signal source. The second transistor conducts during negative half cycle of waveform and the currents from the 2 transistors are combined at the load. A compromise between sound quality of Class A and efficiency of Class B. Most modern amp designs employ this method.

Class D

There are really two types of Class D amplifiers.
Analog-Controlled Class D: Switching amplifiers with an analog input signal and an analog control system. Normally some degree of feedback error correction is presentDigitally-Controlled Class D: Amplifiers with a digitally generated control that switches a power stage. No error control is present. Those that do have an error control can be shown to be topologically equivalent to an analog-controlled class D with a DAC in front. Class G
The power supply voltage in thee amps changes from a lower level to a higher level when larger output swings are required. This is accomplished by utilizing a single class AB output stage connected to two power supply rails by a diode, or a transistor switch. For the majority of program material, the output stage is connected to the lower supply voltage, but it automatically switches to the higher rails for large signal peaks. One other approach uses 2 class AB output stages, each one connected to a different power supply voltage. The strength of the input signal determining the corresponding signal path. 

Posted Date: 2/11/2012 10:48:52 PM | Location : United States







Related Discussions:- Audio amplifier classes, engineering, Assignment Help, Ask Question on Audio amplifier classes, engineering, Get Answer, Expert's Help, Audio amplifier classes, engineering Discussions

Write discussion on Audio amplifier classes, engineering
Your posts are moderated
Related Questions
risks involved in moving from a project-centric mode to a mix of projects and

Q. Why is it desirable to design a casting to have directional solidification sweeping from the extremities of the mould to riser based on Chvorinov's rule? What would be an ideal

Engine Vibration Indication The engine vibration monitoring (EVM) system shows the out of balance force for the N1 and N2 shaft. High engine vibration shows engine damage or


How to calculate the field of views

the effect when side relief angle is too much

PITCH LOCK MECHANISM The pitch lock mechanism is necessary to cater for the two fine pitch position of 'flight fine pitch' and 'ground fine pitch'. It acts as a safety device

Fire alarm systems: Fire alarm systems can be very complex and it is usually not possible for an enforcing officer to check all the cabling, the components, the software and t

Expertsmind.com  brings you unique solution in Electrical Engineering   How does OR gate work? An 'OR' gate is like two or more switches positioned in parallel.

Matlab is a 4th technology selection language, which is designed by The MathWorks. It provides an exact processing atmosphere. Matlab works a variety of math features like design o