Preamplifier Circuit Diagram 2N3903

Audio Preamplifier Circuit Diagram using 2N3903

Introduction

An audio preamplifier circuit is an essential component in audio systems as it enables the amplification of weak audio signals before they are further amplified by a power amplifier stage. The 2N3903 transistor is a commonly used transistor in audio preamplifier circuits due to its excellent performance characteristics. In this article, we will discuss an audio preamplifier circuit diagram using the 2N3903 transistor, along with the specifications of the 2N3903 transistor.

Specification of 2N3903 Transistor:

The 2N3903 is a general-purpose NPN transistor. Its key specifications include:

Maximum collector current: 200mA
Maximum collector-emitter voltage: 40V
Maximum power dissipation: 625mW
Gain bandwidth product: 300MHz
DC current gain (hFE): 100-300

The 2N3903 transistor is known for its low noise and high gain characteristics, making it suitable for audio applications.

Preamplifier Circuit Diagram 2N3903

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

Audio Preamplifier Circuit Diagram using 2N3903 Transistor

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Components List of Preamplifier Circuit Diagram 2N3903

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

2N3903 NPN Transistor x 1
100uF Capacitor x 1
10uF Capacitor x 2
3k Resister x 1
4.7k Resister x 1
1M Resister x 1
680 Ohms Resister x 1
12V to 18V Power Supply

Conclusion

The audio preamplifier circuit using the 2N3903 transistor is a reliable and effective solution for amplifying weak audio signals. The circuit diagram, consisting of the 2N3903 transistor, resistors, capacitors, and audio input and output, provides excellent gain and frequency response characteristics. The 2N3903 transistor’s specifications, such as its low noise and high gain capabilities, make it a preferred choice for audio preamp applications. By employing this circuit, audio enthusiasts can enhance the sound quality of their audio systems.

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