August 02, 2025

20W transistor single-ended class A power amplifier design and production circuit diagram

1206RGB (single)
3225 50M crystal
Crystal oscillator

Circuit principle and design ideas:

The entire circuit can be divided into four main sections: power supply, signal amplification, feedback control, and output stage. Each part plays a crucial role in ensuring the stability and performance of the amplifier.

The power supply section provides clean and stable voltage to all components, minimizing noise and interference. The signal amplification stage uses transistors to boost the input signal, while the feedback control ensures the output remains linear and distortion-free. Finally, the output stage delivers the amplified signal to the speaker or load with minimal loss.

This design is based on a single-ended Class A configuration, which offers high fidelity but lower efficiency compared to other amplifier classes. However, it's ideal for applications where sound quality is the top priority.

20W transistor single-ended class A power amplifier design and production circuit diagram

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