Weak current College】 【power amplifier category.

The amplifier power amplifier tubes of conductive in different ways, can be divided into class a power amplifier (also called A class), CPI amplifier (also known as a B class), a category b amplifier (also known as AB class) and group d power amplifier (also known as the D class).

Class a power amplifier schematic

Class a power amplifier is the signal for the entire period (sine wave of plus or minus two and a half weeks), amplifier power output of any component does not appear on current deadline (i.e. stop output) of a type of amplifier. Class a amplifier work will produce high fever, inefficient, but an inherent advantage is no crossover distortion. Single amplifier is a class a, push-pull amplifier can be r or r or a CPI.

R amplifier schematic


R amplifier is a sinusoidal signal of plus or minus two and a half weeks separately by two push-pull output stage "arm" take turns to enlarge the output of the amplifier, each "arm" of conducting time signal of half a cycle. A bit of class b amplifiers is high efficiency, the disadvantage is that produces crossover distortion.

A category b amplifier schematic


A category b amplifier is between category a and category b, push-pull amplification of each "arm" open time is greater than the signal of a half-cycle is less than one cycle. A CPI zoom solved r amplifier crossover distortion, efficiency and high class a amplifier for a very wide range of applications.

Group d power amplifier schematic


Group d power amplifier also known as digital amplifier, the use of extremely high frequency switch circuit to magnify the audio signal, high efficiency, small size advantages. Many power up to 1000W group d amplifier, the volume is just as big as VHS video. This type of amplifier is not suitable for wide-band amplifier, but in active subwoofer in larger applications.

Press power amplifier output stage to enlarge the number of components can be divided into single amplifier and push-pull amplifier.

Single-ended output stage of the amplifier by a zoom components (or only a symbol but parallel to a group) to complete the signal plus or minus two and a half weeks of amplification. You can only use a single amplifier.

Push-pull amplifier output stage have two "arms," (two sets of amplification components), an "arm" of the current increases, another "arm" of the current decrease, the State took turns to convert. On the load, it seems to be a "boom" in a "push" in La, arm complete current output tasks. Although r amplifier can push-pull amplification, but more common use of push-pull amplification consisting of a class b or b amplifiers.

The amplifier power amplifier tubes of different types can be divided into danji and Stoner.

The use of electron tube danji amplifier. Machine is using a transistor amplifier.

Press function, can be divided into preamplifier (also known as the former level), power amplifiers (also called back-level) and merge type amplifier.

Without signal source selection, volume control, and other ancillary function of the power amplifier is called after the class.

Preamplifier is functional before the pre amplifier and control parts, for enhanced signal voltage ranges, and provide input signal selection, tone adjustment and volume control. Preamplifier is also referred to the fore.

The preamplifier and power amplifier with two most installed on the same box amplifier called merge-amplifier, common in our house amplifier is merged.

By purpose, can be divided into AV amplifier, Hi-Fi amplifier.

AV amplifier


AV amplifier is designed for home theater use and design of the amplifier, generally equipped with four or more channels and surround sound decoding functionality with a display screen. Class amplifier to true to create the film environment sound theater the audience experience as main objectives.

Hi-Fi amplifier


Hi-Fi amplifier for high-fidelity to the true live music and design of the amplifier, usually two-channel design, and does not display.

In accordance with the use of different components, power amplifier and "danji" (electron tube power amplifier), "Stoner" (transistor amplifier), the "PA" IC (integrated circuit amplifier). In recent years because of new technologies, new concepts in danji, makes this old vacuum tube devices also in Germany, it's beautiful voice, many shaoyou admirers. Experienced enthusiasts almost all have a terrace. "IC amplifier" because it doesn't match up two amplifier so Hi-Fi amplifier rarely saw his shadow.

Amplifier in General can be divided into three main categories of "amplifier" and "civil power amplifier," "special amplifier".

Professional amplifier is typically used for meetings, performances, Auditorium, field, the Museum of the loudspeaker. Designed to output power, protection circuit, good heat dissipation. Most professional power amplifier sound replay for Hi-Fi, sound, dry and hard not resistant to listen.

Civilian power amplifier detailed classification is divided into "Hi-Fi amplifier" "AV amplifier," "KALAOK amplifier", as well as to commonly used functionality is based on one of the so-called "integrated amplifier".

"Hi-Fi amplifier" is our enthusiasts amplifier, its output power General most 2 * 150 watts. Designed to "tone is exquisite, high-fidelity". Various high-tech embodied in this amplifier. The price is $ from thousands to tens, etc. "Hi-Fi" is divided into the "split" (the former level amplifier independent out), and "merge" (to the fore and after the class made into one). Generally speaking, in the same grade of models "split" in the SNR, channel segmentation etc indicators over the "merge" (not absolute). And easy-to-signal wire code. Merge-machine is easy to use, the advantages of a relative low cost, cheap combined machine output power most of the design in General 2 * 100W following, many manufacturers to produce more than 100W 2 * high-And machine.

"AV" amplifier is running out of a horse, with large screen TV, and a variety of image carriers universal, "sitting at home watching the film" demand growing, so set a variety of audio and video features in one multifunction amplifier came into being. "AV" is English, audio, video AODIOVIDIO's begin with a letter abbreviation. "AV amplifier," from birth until now, has undergone a Dolby Surround, Dolby, directional logic, DTS AC-3, AV amplifier and amplifier difference AV amplifier, AV select Dolby directional logic decoder, DTS decoder, AC-3, and five-channel power amplifier. And the finishing touch of digital sound field (DSP) circuit, for a variety of programs play a different sound field effect. However, due to AV amplifier in the circuit of signal circulation, after a long and complex processing circuit, the purity of the sound is too much "dyeing", so use AV amplifier compatible with Hi-Fi replay is not ideal, this is a lot of Hi-Fi enthusiasts on AV amplifier reason loath.

"KALAOK amplifier" is also grown in recent years, a power amplifier. Its general power amplifier differ "KALAOK amplifier" reverberator BBD simulation from the past to the present reverb DIGETAL digital reverb, modulation, microphone amplifier. In recent years a number of manufacturers to market needs, including AV amplifier, KALAOK amplifier, various functions-one that is, the so-called "integrated amplifier", this is a hybrid amplifier, nothing, nothing, is a way for the countryside to resist the power amplifier.

"Special amplifier" as the name implies, is used in the special occasion of power amplifiers, e.g. alarm, auto diya amplifier etc.