750W Power Amplifier Circuit Diagram using 2N3055 & MJE2955

Introduction

Power amplifiers play a crucial role in the world of audio engineering, delivering high-quality sound output to listeners. In this article, we will explore a powerful 750W power amplifier circuit diagram utilizing transistors such as the 2N3055, MJE2955, C2073, and A940, along with the HA17741 IC. This circuit offers excellent performance and reliability, making it well-suited for numerous audio applications.

Specifications

• 2N3055 Transistor: NPN power transistor, maximum collector current of 15A, excellent thermal stability and low saturation voltage.
• MJE2955 Transistor: Complementary PNP transistor, similar characteristics to the 2N3055, reliable and efficient amplification solution.
• HA17741 IC: Dual operational amplifier, wide bandwidth, and low noise characteristics, ideal for pre-amplification stage.

750W Amplifier Circuit Diagram 2N3055

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

More Circuit Layouts

Components List of 750W Amplifier Circuit Diagram 2N3055

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

• 2N3055 Transistor x 5
• 2N2955 Transistor x 5
• 2SA940 Transistor x 2
• 2SC2073 Transistor x 2
• HA17741 IC OPAMP x 1
• 33k Resister x 1
• 1k Resister x 2
• 5K6 Resister x 2
• 56k Resister x 1
• 100R Resister x 7
• 18k Resister x 2
• 330R Resister x 2
• 10R Resister x 3
• 2K2 Resister x 10
• 0R33/5W Resister x 10
• 1uF Capacitor x 1
• 100pF Capacitor x 1
• 100uF Capacitor x 3
• 15pF Capacitor x 1
• 680pF Capacitor x 2
• 220pF Capacitor x 2
• 330pF Capacitor x 2
• 0.1uF Capacitor x 1
• D4148 Diode x 2
• 15 Zener Diode x 2
• 16 Turns Coil x 1
• Speaker 8 ohms
• +/-70V Power Supply

Explanation of 750W Amplifier Circuit Diagram 2N3055

The 750W power amplifier circuit diagram presented here utilizes a combination of transistors and an integrated circuit to achieve high power output. The key components used in this circuit are the 2N3055 and MJE2955 transistors, which are well-known for their robustness and ability to handle high currents.

The 2N3055 transistor is an NPN power transistor with a maximum collector current of 15A. It exhibits excellent thermal stability and low saturation voltage, making it an ideal choice for power amplifiers. The MJE2955 transistor, on the other hand, is a complementary PNP transistor with similar characteristics to the 2N3055, offering a reliable and efficient amplification solution.

Additionally, the circuit diagram incorporates the C2073 and A940 transistors, which are high-voltage NPN and PNP bipolar transistors, respectively. These transistors assist in improving the overall performance of the amplifier by ensuring stable power delivery and reducing distortion.

To further enhance the circuit’s performance, the HA17741 IC is employed. This IC is a dual operational amplifier with a wide bandwidth and low noise characteristics. It acts as a pre-amplifier, providing accurate signal amplification before being fed into the main power amplifier stage. The HA17741 IC’s top-notch features make it an excellent choice for this power amplifier design.

Conclusion

In conclusion, the 750W power amplifier circuit diagram utilizing transistors like the 2N3055, MJE2955, C2073, and A940, along with the HA17741 IC, offers a robust and efficient solution for high-power audio applications. The combination of these components ensures reliable operation and excellent sound quality. Whether it’s for professional audio systems, home theater setups, or DIY projects, this power amplifier circuit is a reliable choice.

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