2N3055 & MJ2955 Class-AB Amplifier Circuit Diagram

Introduction

When it comes to audio amplification, Class AB amplifiers have been traditionally used in many electronics applications. This is because they offer a good balance between efficiency and sound quality. Two commonly used transistors are 2N3055 and MJ2955 in Class-AB amplifier circuit design. These transistors are popular due to their high power handling capabilities and excellent thermal properties. However, to enhance the performance of the amplifier circuit in the audio section, it is recommended to use C2383 transistor.

In this article, we will explore the basics of Class AB amplification, the features of 2N3055 and MJ2955 transistors, and how to use a C2383 transistor to improve the performance of these transistors in Class AB amplifier circuit design.

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Circuit Diagram

of 2N3055 MJ2955 Class-AB Amplifier

2N3055 MJ2955 Class-AB Amplifier Circuit Diagram
2N3055 MJ2955 Class-AB Amplifier Circuit Diagram




More Circuit Layouts





 Transistor Pinout for 2N3055 & MJ2955 Class-AB Amplifier
2N3055 Transistor Pinout

Components List

of 2N3055 MJ2955 Class-AB Amplifier

  • 2N3055 Transistor x 1
  • MJ2955 Transistor x 1
  • 2383 Transistor x 1
  • 4700uf Capacitor x 1
  • 220uf Capacitor x 1
  • 100k Resister x 1
  • 1k Resister x 1
  • 380 Ohm Resister x 1
  • 1N4148 Diode x 2
  • 50k Potentiometer x 1
  • 4 Ohm Speaker
  • 2 Pole Terminal Block x 1
  • MP3 Bluetooth Player (optional)

Class-AB Amplification

Class AB amplifiers use a combination of Class-A and Class-B operations. Class-A operation is when the output transistor conducts for the entire input cycle regardless of the input signal. Class-B operation occurs when the output transistor conducts for only half of the input cycle, specifically during the positive cycle of the input signal.

Class AB amplifiers use a biasing circuit to ensure that the output transistor is slightly conducting at all times, even when there is no input signal. This biasing circuitry provides a small amount of power to the output transistor, which helps to eliminate any distortion in the output signal. Class AB amplifiers are suitable for audio amplification because they offer a higher efficiency than Class-A amplifiers, but with less distortion than Class-B amplifiers.



2N3055 and MJ2955 Transistors for Class-AB Amplifier

2N3055 and MJ2955 are commonly used in Class AB amplifier circuits due to their high current and voltage handling capabilities. The 2N3055 is an NPN transistor while MJ2955 is a complementary PNP device. These transistors are generally used in power amplifiers and voltage regulators due to their high gain and high current capacity.

Both 2N3055 and MJ2955 transistors have a maximum collector current rating of 15A and a maximum collector-emitter voltage rating of 60V. They are designed to operate at up to 200W of power output, making them suitable for high-power applications. However, their high power handling capacity makes them prone to thermal issues. Overheating can adversely affect the performance and longevity of these transistors, making it crucial to incorporate proper thermal management techniques in the amplifier circuit design.

Use of C2383 Transistor in Audio Section

of 2N3055 MJ2955 Class-AB Amplifier

C2383 transistor is a small-signal NPN transistor that is commonly used in audio amplifiers, particularly in the preamp section. It has a low noise and high gain characteristic, which makes it ideal for use in amplifiers that require a low noise floor. The C2383 can handle a current of around 200 mA, which is comparatively low when compared to high-power transistors like 2N3055 and MJ2955. However, the use of C2383 transistor in the audio section of the amplifier can significantly improve the overall performance of the system.

When C2383 is used in the preamp section, it improves the amplification of low-level signals, resulting in a better signal-to-noise ratio. It also helps to eliminate any distortion in the initial stages of signal amplification, resulting in a cleaner signal with less noise. This, in turn, reduces the power requirements of the output transistors, resulting in better thermal management and improved overall amplifier performance.



Conclusion

Class-AB amplifiers are a popular choice for audio applications due to their balanced efficiency and sound quality. The use of 2N3055 and MJ2955 transistors is common for Class-AB amplifiers, as they offer high power handling capacities. However, to improve the performance of these transistors, it is recommended to incorporate a C2383 transistor in the audio section. The C2383 transistor improves low-level signal amplification, resulting in a better signal-to-noise ratio and a cleaner output signal. This, in turn, reduces the power requirements of the output transistors, improving overall amplifier performance. Proper thermal management techniques are crucial when using high power transistors like 2N3055 and MJ2955 to ensure optimal performance and longevity.

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2N3055 MJ2955 Class-AB Amplifier Circuit Diagram
2N3055 MJ2955 Class-AB Amplifier Circuit Diagram
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