20 Watt Power Amplifier Circuit Diagram

Introduction

Circuit Diagram of 20 Watt Power Amplifier using SE9301 and SE9401 transistors.

The amplifier is an essential component for any music lover looking to amplify the sound of their music and elevate it to the next level. In this article, we will explore the use of two Darlington transistors SE9301 and SE9401 of the TO-220 package, one 2N5961 transistor, and 8 ohms speakers to create a powerful and efficient amplifier.

Before diving into the specifics of the components used to build the amplifier, let’s first understand what an amplifier is and what it does. An amplifier is an electronic device that amplifies the sound signals from an audio source, such as a CD player, a turntable, or a mobile device. The amplified signal is then sent to the speakers, which reproduces the sound for the listener to hear.



Circuit Diagram

of 20 Watt Power Amplifier

20 Watt Power Amplifier Circuit Diagram
20 Watt Power Amplifier Circuit Diagram



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This easy 20 Watt Power Amplifier is less expensive and may be built with TO-220 monolithic Darlington transistors for the push-pull output stage. Frequency response is flat within 1 dB from 30 Hz to 200 kHz with typical harmonic distortion below 0.2%. The 20 Watt Power Amplifier requires only 1.2 Vrms for a complete 20 W output into an 8-ohm load. Only one other transistor is needed, the high-gain low-noise TO-92 2N5961 (Q1), to provide voltage gain for driving the output Darlingtons. Its base (factor B) is the tying factor for ac and dc remarks in addition to the sign input. Input resistance is 10 K. The middle voltage at factor A is about adjusting resistor R4. A bootstrap circuit boosts the collector supply voltage of Q1 (point C) to ensure sufficient drive voltage for Q2. This additionally affords steady voltage throughout R7, which consequently acts as a present-day supply and, collectively with diodes D1-D3, reduces low-sign crossover distortion.

Working Explanation

of 20 Watt Power Amplifier

First, we have the SE9301 & SE9401 transistors. The SE9301 is an amplifier IC that is known for its high efficiency and low power consumption. This makes it an ideal choice for creating a stereo amplifier that delivers power and high-level sound quality without consuming too much energy.

The SE9301 transistor has a maximum output power of 2 x 30W at 4 ohms, which means that our stereo amplifier will be able to deliver up to 60 watts per channel when using two SE9301 & SE9401 transistors.

Next, we have the 2N5961 transistor. The transistor is used to control the current flow to the SE9301 transistor and ensure that the amplifier operates at an ideal voltage and current level. The 2N5961 transistor is a high-performance NPN transistor that is designed to handle high power levels and operates at high frequencies, making it an excellent choice for a stereo amplifier.

Finally, we have the 8 ohms speakers. The speakers are perhaps the most critical component in the stereo amplifier since they are responsible for reproducing the sound. The 8 ohms speakers are standard speakers that are designed to work with most amplifiers and provide clear and powerful sound with minimal distortion.

So, now that we know the components that make up our stereo amplifier, let’s look at how they all work together.

The SE9301 & SE9401 transistors are connected to the output of the input source, such as a CD player or a turntable. The 2N5961 transistor is then connected to the SE9301 transistor to regulate the current flow from the power source. The output from the transistor is then sent to the 8 ohms speakers, which reproduce the sound.



One crucial factor to keep in mind when building a stereo amplifier is the power supply. The SE9401 transistor requires a voltage of 12V, so a power supply unit that can deliver this voltage is needed to power the amplifier. It is also essential to make sure to use a high-quality power supply to ensure that the amplifier operates at its maximum efficiency and produces optimal sound quality.

The stereo amplifier using two SE9301 & SE9401 transistors and one 2N5961 transistor and 8 ohms speakers is an excellent choice for anyone looking for a powerful and efficient amplifier that delivers high-quality sound. The use of Class D amplifier transistors makes this amplifier incredibly energy-efficient without sacrificing performance or sound quality. Furthermore, the 2N5961 transistor and 8 ohms speakers complement the SE9301 & SE9401 transistors and ensure that the amplifier operates at an ideal voltage and current level, providing reliable, high-quality sound.

Conclusion

The amplifier using two SE9301 & SE9401 push-pull Darlington TO-220 transistors, one 2N5961 transistor, and 8 ohms speakers is an excellent choice for anyone looking to amplify the sound of their music and create powerful, clear sound without consuming too much energy. It is, therefore, the ideal choice for music lovers looking to create a powerful and efficient audio setup.

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20 Watt Power Amplifier Circuit Diagram
20 Watt Power Amplifier Circuit Diagram
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2 comments on 20 Watt Power Amplifier Circuit Diagram

  1. The SE9300 and SE9400 series of NPN and PNP Darlington power transistors in the TO-220 case are discontinued and now classified as End of Life (EOL).
    Central Part Number Replacement
    SE9300 2N6388
    SE9301 2N6388
    SE9302 2N6388
    SE9400 2N6668
    SE9401 2N6668
    SE9402 2N6668

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