AUDIO AMPLIFIER TRAITS CLASS A CLASS AB CLASS B CLASS C CLASS D AS WELL AS UNDERSTANDING THE FUNCTION OF THE AMPLIFIER

POWER AMPLIFIER

UNDERSTANDING:

     The amplifier is a series of electronic components which are used to strengthen the power (or in General). In the field of audio, amplifiers will strengthen signal sound shaped analogue of sound source i.e. strengthen signal/gain current (I) and voltage (V) Power AC signal from its input shaped into electric current and voltage AC, its also will be larger at the output.

FUNCTION:

     Amplifier or Audio Amplifier is an amplifier that serves to strengthen the audio signal is then fed to the loudspeaker.

VARIOUS:

✓ CLASS A:
Characteristics:
• Output Signals are working on the active region.
• Re-imports are high.
• The shape of the output signal is exactly the same as the input.
• A low Efficiency.
• The transistors are always ON so most of the resources wasted into heat power supply
• Class A amplifier Transistor needs to be coupled with extra cooling (e.g. larger heatsink)

✓ Class B:
characteristics:
• Pushpull or transistors work alternate between 1 Transistor (NPN) and 2 Transistors (PNP)
• The heat generated is not too large
• Greater Efficiency (75%)
• The existence of cross-disability (crossover)
• The power supply voltage of +,-, and ground

✓ CLASS AB:
Characteristics:
• Pushpull or transistors work alternate between 1 Transistor (NPN) and 2 Transistors (PNP)
• The heat generated is not too large
• Greater Efficiency (50%-75%)
• Cross-disability does not occur (crossover)
• Re-imports high
• The second signal on the fattening took place transistornya active at the time of transition (gumming)
• The power supply voltage of +,-, and ground

✓ CLASS C:
Characteristics:
• Only requires 1 transistor
• Working actively only on the positive phase
• High efficiency (100%)
• Re-imports lower than class AB
• Is often used on the circuit oscillator transmitter
• Working in the active

✓ CLASS D:
Characteristics:
• Using PWM (Pulse Width Modulation) where the width of the pulses is proportional to the amplitude of the input signal
• Work as a switching Transistor
• Using the technique of sampling
• Need a triangle wave generators and comparators to generate a PWM signal is proportional to the amplitude of the input signal
• Re-imports to raise required filters
• Commonly used in 1 bit digital amplifier