100W Subwoofer Amplifier Circuit Diagram

Introduction

A subwoofer amplifier is an essential component of any audio system, designed to enhance the low-frequency performance of the speakers. A 100W subwoofer amplifier circuit diagram using 2N3773 transistors is a popular choice among audio enthusiasts due to its excellent power output and overall performance. In this article, we will explore the circuit diagram, specifications of the 2N3773 transistors, and the advantages of using this particular design for your subwoofer amplifier.

Here we have a highly efficient and powerful 100w subwoofer amplifier with a circuit design consisting of seven transistors, including four in the output stage. The initial preamplifier stage is formed by a pair of BC108 transistors, while the output stage comprises 2N5294, 2N6107 and a pair of 2N3773 transistors. Unlike many other amplifiers, this particular one does not rely on integrated circuits, making it extremely durable and easily assembled on a general-purpose PCB.

To power this amplifier, a dual power supply with a capacity of +35V/-35V and 5A is recommended. Make sure to connect a 100W, 12-inch subwoofer to the output for optimal performance. Additionally, it is crucial to use electrolytic capacitors with a rating of at least 100V to avoid any potential issues.

To keep the transistors in the output stage cool and prevent overheating, it is advisable to attach heat sinks to 2N5294, 2N6107 and a pair of 2N3773 transistors. By following these guidelines, you can ensure both the longevity and outstanding performance of this transistorized subwoofer amplifier.

100W Subwoofer Amplifier Circuit Diagram

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

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Components List of 100W Subwoofer Amplifier Circuit

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

2N3773 Transistor x 2
2N5294 Transistor x 1
2N6107 Transistor x 2
BC108 Transistor x 2
0.22uF Capacitor x 1
4.7uF Capacitor x 1
10uF Capacitor x 1
560pF Capacitor x 1
47uF Capacitor x 1
47k Resister x 2
10k Resister x 2
4.7k Resister x 1
680 ohms Resister x 1
22 ohms Resister x 1
22 ohms 5w Resister x 2
1k 1w Resister x 1
1.5k 2w Resister x 1
100 ohms 2w Resister x 2
0.33 ohms 5w Resister x 2

Specifications of 2N3773 Transistor:

The 2N3773 is a popular power transistor used in amplifier circuits due to its impressive specifications. Some of its key specifications are as follows:

Collector-Emitter Voltage (VCEO): 140V
Collector-Base Voltage (VCBO): 160V
Continuous Collector Current (IC): 16A
Power Dissipation (PD): 150W
Transition Frequency (ft): 8MHz
Gain-Bandwidth Product (GB): 3MHz
Operating Junction Temperature (Tj): -65 to 200°C

These specifications make the 2N3773 transistor an excellent choice for high-power applications such as subwoofer amplifiers. Its high maximum current handling ability ensures that the amplifier can deliver significant power to the speakers without causing thermal issues.

Advantages of the Circuit Design:

High Power Output: With 100W of power output, this subwoofer amplifier circuit using 2N3773 transistors is capable of providing rich and deep bass frequencies, enhancing the overall audio experience.
Improved Thermal Stability: The 2N3773 transistor, with its excellent thermal stability, ensures that the amplifier remains reliable even during long listening sessions or in high-temperature environments. This minimizes the risk of overheating and component failure.
Low Distortion: The class AB amplifier topology used in this circuit reduces distortion to a minimum, ensuring that the sound produced is clean and accurate, without unwanted artifacts. This allows the subwoofer to reproduce the low-frequency signals faithfully.
Easy to Construct: The 100W subwoofer amplifier circuit using 2N3773 transistors is relatively straightforward, making it easier for hobbyists to build their amplifier. The readily available 2N3773 transistors make it convenient to source the components for the project.

Conclusion:

The 100W subwoofer amplifier circuit using 2N3773 transistors is a highly reliable and efficient design that offers a range of benefits. Its high-power output, thermal stability, low distortion, and ease of construction make it an excellent choice for audio enthusiasts looking to enhance their subwoofer’s performance. The 2N3773 transistor’s specifications further add to its appeal, guaranteeing sufficient power handling and reliable operation. By incorporating this circuit into your subwoofer amplifier setup, you can enjoy rich and immersive bass reproduction, elevating your audio experience to new heights.

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