UNDERSTAND THE NATURE AND BRACE PURPOSE UNDERSTAND NATURE SIGNAL AUDIO By Sarbini, S.Pd (SMK Muhammadiyah 3 Yogyakarta)

UNDERSTAND THE NATURE AND BRACE PURPOSE

UNDERSTAND NATURE SIGNAL AUDIOBy Sarbini, S.Pd (SMK Muhammadiyah 3 Yogyakarta)

Teknologi dan Rekayasa

A. AMPLIFIER

Amplifier or power amplifier function amplify the audio signal and then follow to the loudspeaker

POWER AMPLIFIER

Power Amplifier tata panggung


Fidelitas and Efficiency

Fidelity means that the similar form of the output signal of a replica of the original input signal.

Brace system is said to have fidelitas high (high fidelity), if the system is able to produce the output signal of exactly the same as the input signal.


Efficiency: comparison of power output than the input power.

Brace system said to have high levels of efficiency (100%) if there is no loss-loss in the process amplify / no power be heat.


B. AMPLY VARIOUS

1.Class A Characteristics:

Signal output work on active areas. Fidelitas high Form of signal keluarannya match the input

Low efficiency (25% - 50%). Transistor is always ON, so most of the power

source portion terbuang heat. Transistor class A brace plus the necessary extra

cooling (such as a larger heatsinks).


Kurva amply class A


2. CLASS B

Characteristics :

Phuspull / Transistors work alternately between the transistors Q1 (NPN) and Q2 (PNP).

Heat generated is not too large

Greater efficiency (75%)

There is a cross-disability (cross over)

Power supply voltage +, _ and Ground


Curve amply class B


Series amply class B


3. CLASS AB

Characteristics :

Phuspull / transistors work alternately between the transistors Q1 (NPN) and Q2 (PNP).

Heat generated is not too large

Greater efficiency (50% s / d 75%)

Disability does not occur cross (cross over)

Fidelitas Highest

There was a signal on my second transistornya actively at the time of transition (gumming).

Power supply voltage +, _ and Ground


Series brace Class AB OVERLAPPING OUTPUT PENGUAT KELAS AB


4. CLASS C

Characteristics :

Transistors only need one work only on the active phase positive High efficiency (100%) Fidelitas lower than class AB Often used in a series of transmitter oscillator Working in the area of active / linear


Series brace Class C


5. CLASS D Characteristics

Using the PWM technique Pulsa Width Modulation) where the width of the balance is proportional to the input signal amplitudo.


Illustrated amply PWM modulation class D


Working as a switching transistor

Using sampling techniques

require a triangular wave generator and comparator to produce a signal proportional to the PWM signal input amplitudo.

Raising fidelitas required to filter Brace is often used in digital 1 bit (on or off).


6. CLASS E

Characteristics: Brace similar to the class C

Require a series of LC with a working transistor less than half a duty cycle

Working as a switching transistor

Usually require the type of FET transistors


Efficient and suitable for applications that require large drive currents, but with the input current is very small.

Disipasi small heat

Usually applied to the transmission equipment such as mobile phone


7. CLASS T

Characteristics :

Also called digital brace

Using the concept of modulation PWM switching transistor and the filter

The process is a manipulation of the previous bit-bit digital. In a processor with the audio feedback process that is also a digital correction for time delay and phase.


8. CLASS G

Characteristics :

Including analog brace to improve the efficiency of the brace class B / AB

Supply Voltage made step because requires a high voltage


Brace the concept of class G with a supply voltage multilevel


9. CLASS H

Characteristics :

Including analog brace to improve the efficiency of the brace class B / AB

Brace similar to the G-class supply voltage that can be changed as needed

Complex but efficient

High-low voltage supply is designed to be more limited linier not only have 2 or 3 phase only

Supply voltage and the voltage output is only a few more high-volt

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UNDERSTAND THE NATURE AND BRACE PURPOSE UNDERSTAND NATURE SIGNAL AUDIO By Sarbini, S.Pd (SMK Muhammadiyah 3 Yogyakarta)