Power Amplifier Circuit Diagram using D1047 & B817 – ROTEL RA840B

Introduction

Power amplifiers are essential components in audio systems, providing the necessary boost in signal strength to drive speakers and deliver quality sound. When it comes to designing power amplifier circuits, selecting the right transistors is crucial. In this article, we will discuss a power amplifier circuit diagram that incorporates two pairs of 2SD1047 & 2SB817 transistors in the output section, along with 2SD600, 2SB631, 2SC1941 & 2SA1016 transistors in the driver and preamplifier sections. This circuit offers reliable performance and excellent sound quality for audio enthusiasts.

Specifications of Transistors Used in the Circuit:

1. 2SD1047 – NPN Transistor:
   • High voltage and current capability.
   • Collector current: 15A.
   • Collector-base voltage: 140V.
   • Power dissipation: 150W.
2. 2SB817 – PNP Transistor:
   • High voltage and current capability.
   • Collector current: 15A.
   • Collector-base voltage: -140V.
   • Power dissipation: 150W.
3. 2SB600 – PNP Transistor:
   • Low noise PNP transistor for audio applications.
   • Collector current: 3A.
   • Collector-base voltage: -70V.
   • Power dissipation: 20W.
4. 2SB631 – PNP Transistor:
   • PNP transistor with low saturation voltage.
   • Collector current: 2A.
   • Collector-base voltage: -60V.
   • Power dissipation: 20W.
5. 2SC1941 – NPN Transistor:
   • High gain NPN transistor for low noise applications.
   • Collector current: 1.5A.
   • Collector-base voltage: 180V.
   • Power dissipation: 20W.
6. 2SA1016 – PNP Transistor:
   • High gain PNP transistor for low noise applications.
   • Collector current: 1.5A.
   • Collector-base voltage: -180V.
   • Power dissipation: 20W.

Amplifier Circuit Diagram using 2SD1047 & 2SB817

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

Caution: Website contains information on high voltage circuits. Proceed at your own risk, ensuring proper knowledge and precautionary measures to prevent electric shock or injury.

More Circuit Layouts

Components List of Amplifier Circuit Diagram using 2SD1047 & 2SB817

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

• 2SD1047 transistor x 2
• 2SB817 transistor x 2
• 2SD600 transistor x 2
• 2SB631 transistor x 3
• 2SC1941 transistor x 1
• 2SA1016 transistor x 3
• 1N4148 diode x 2

Explanation of Amplifier Circuit Diagram using 2SD1047 & 2SB817

The power amplifier circuit diagram using 2SD1047 & 2SB817 described here utilizes a symmetrical design, ensuring balanced amplification of the audio signal. The output section of the circuit features two pairs of 2SD1047 & 2SB817 transistors, which are known for their high power handling capabilities. These transistors provide sufficient current and voltage amplification, making them ideal for driving loudspeakers.

Moving on to the driver and preamplifier sections, we find the 2SD600, 2SB631, 2SC1941, and 2SA1016 transistors. These transistors are specifically chosen for their low noise and high gain properties. The 2SD600 and 2SB631 transistors act as output driver transistors, while the 2SC1941 and 2SA1016 transistors function as input stage preamplifiers. This combination ensures accurate and distortion-free signal amplification.

Conclusion

In conclusion, the power amplifier circuit diagram incorporating two pairs of 2SD1047 & 2SB817 transistors in the output section, along with 2SD600, 2SB631, 2SC1941 & 2SA1016 transistors in the driver and preamplifier sections, offers a reliable and high-performance audio amplification solution. These transistors, with their unique specifications, ensure the amplification process is precise, low-noise, and capable of driving speakers effectively. Whether you are an audio enthusiast or a professional in the field, this power amplifier circuit is a solid choice for achieving excellent sound quality and powerful performance.

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