Simple Audio Amplifier Circuit using 2N3055 100W

Simple Audio Amplifier Circuit Diagram using 2N3055 100W
Simple Audio Amplifier Circuit Diagram using 2N3055 100W

Introduction

Audio amplifiers are essential components in any sound system, as they increase the amplitude of the audio signal to make it audible through speakers or headphones. While there are numerous amplifier circuits available, a simple and reliable option is the 100W simple audio amplifier circuit using the 2N3055, MJ2955, 2N3053, and 2N4037 transistors and 741 operational amplifier IC. In this article, we will explore the specifications of the 2N3055 and MJ2955 transistors and discuss the working principle of this amplifier circuit.

Specifications of 2N3055 Transistor:

The 2N3055 is a popular NPN bipolar transistor widely used in audio amplifier circuits. It is capable of handling up to 15A of current and can provide a maximum power dissipation of 115W. With a voltage rating of 60V, it can handle a variety of audio signals without distortion. The 2N3055 transistor has a DC current gain (hFE) of 20-70, making it suitable for medium-power amplification applications. Its high power-handling capability combined with its availability and affordability make it an ideal choice for audio amplifier designs.

Specifications of MJ2955 Transistor:

The MJ2955 is the complementary PNP transistor to the 2N3055, designed to work together in audio amplifier circuits for enhanced performance. Similar to the 2N3055, the MJ2955 can handle currents of up to 15A and provide a power dissipation of 115W. It has a voltage rating of 60V, making it compatible with a wide range of audio signals. The MJ2955 transistor has a DC current gain (hFE) of 20-70, ensuring a balanced and efficient amplification process when paired with the 2N3055.



Circuit Diagram of Simple Audio Amplifier Circuit

This project can be built using a few basic components. The circuit diagram of this project is shown below.

Simple Audio Amplifier Circuit using 2N3055 100W
Simple Audio Amplifier Circuit using 2N3055 100W
35V power supply Circuit Diagram
35V power supply Circuit Diagram




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Components List of Simple Audio Amplifier Circuit

Following is the list of all components used in this project:

  • 2N3055 Transistor x 1
  • MJ2955 Transistor x 1
  • 2N3053 Transistor x 1
  • 2N4037 Transistor x 1
  • 741 IC x 1
  • 1k Resister x 2
  • 21k Resister x 1
  • 2k Resister x 2
  • 5R Resister x 1
  • 15k Resister x 2
  • 50R/2W Resister x 4
  • 500R/5W Resister x 2
  • 1k Pot x 1
  • 4.7uF Capacitor x 1
  • 100uF Capacitor x 1
  • 47uF Capacitor x 2
  • 10pF Capacitor x 1
  • 15V Zener Diode x 2
  • 1N4148 Diode x 2
  • +/-35V Power Supply




Working Principle of the 100W Simple Audio Amplifier Circuit

The 100W audio amplifier circuit using the 2N3055, MJ2955, 2N3053, and 2N4037 transistors operates on a Class AB amplifier configuration. This configuration combines the advantages of Class A and Class B amplifiers, providing a balance between efficiency and low distortion.

The audio input signal is first coupled to the input of the 741 IC through a coupling capacitor. The 741 operational amplifier IC acts as a pre-amplifier by amplifying the small input signal and passing it to the driver stage. The driver stage consists of the 2N3053 and 2N4037 transistor, which further amplifies the signal and drives the power output stage.

The power output stage is composed of the 2N3055 and MJ2955 transistors. The audio signal amplified by the driver stage is fed to the bases of these transistors, which act as switches and amplify the signal to a level suitable for driving the speakers. The output stage is designed to handle high currents, providing sufficient power for the speakers to produce clear and loud audio.

pecification of 741 Operational Amplifier IC:

  1. Power Supply: The 741 operational amplifier IC typically operates within a dual power supply range of +/- 10V to +/- 15V. It can also work with a single power supply ranging from 10V to 30V.
  2. Gain Bandwidth Product: The device has a typical gain bandwidth product of 1 MHz, which means the device can amplify signals with frequencies up to 1 MHz without significant distortion.
  3. Input Voltage Range: The 741 IC has an input voltage range that includes the entire supply voltage range. It can handle both positive and negative input signals.
  4. Slew Rate: The slew rate of the 741 IC is typically around 0.5 V/µs. It defines the maximum rate at which the output voltage can change in response to a step change in the input voltage.
  5. Output Voltage Range: The typical output voltage range of the 741 IC is within a few volts of the power supply voltages. However, the actual range can depend on the specific operating conditions and load connected.
  6. Output Current: The output current capacity of the 741 IC is limited and typically ranges from 20-30 mA. This specification specifies the maximum amount of current that the device can deliver to an external load.
  7. Temperature Range: The 741 IC is generally designed to operate within a temperature range of -55°C to +125°C. This wide temperature range allows for reliable operation in various environments.

Conclusion

The 100W audio amplifier circuit using the 2N3055, MJ2955, 2N3053, and 2N4037 transistors and 741 op-amp is a reliable and efficient option for amplifying audio signals. The 2N3055 and MJ2955 transistors, with their high current handling capability and balanced amplification characteristics, ensure high-quality audio output. By understanding the specifications and working principle of these transistors, audio enthusiasts can build their own powerful amplifier circuits with ease.

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For more project and circuit diagrams, you can go through the Schematics in the main menu where you can find many interesting projects and circuit diagrams like audio amplifier circuits, voltage booster circuitbattery charger circuit and timer circuits etc., which are all beginner circuit projects. Feel free to check them out!

Simple Audio Amplifier Circuit using 2N3055 100W
Simple Audio Amplifier Circuit using 2N3055 100W

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