Table of Contents
Introduction
The TDA7279 is a high-performance audio amplifier integrated circuit widely used in audio applications that require low distortion and high output power. It is designed for use in stereo amplifier systems, home audio devices, and vehicle sound systems. The IC is a dual-bridge amplifier that provides high efficiency and superior sound quality by minimizing distortion and power loss.
The circuit based on the TDA7279 IC can drive two speakers simultaneously, making it an ideal choice for stereo audio applications. Its built-in standby and mute functions enhance power management and reduce unwanted noise. Additionally, the circuit requires minimal external components, simplifying design and reducing overall costs. The TDA7279 amplifier is highly reliable and delivers stable performance, making it a preferred choice for various audio amplification projects.
Circuit Components
| S.No | Component Name | Value | Quantity |
|---|---|---|---|
| 1 | TDA7279 IC | – | 1 |
| 2 | Capacitor | 0.22µF | 2 |
| 3 | Capacitor | 470µF | 1 |
| 4 | Capacitor | 100nF | 1 |
| 5 | Resistors | – | As required |
| 6 | Speaker | 8Ω | 2 |
| 7 | Power Supply | 12V-18V | 1 |
TDA7279 Pinout
Circuit Diagram
Working Principle
The TDA7279 operates as a dual-bridge amplifier, meaning it uses two amplifier channels to drive each speaker. The input audio signals are fed into the amplifier’s inputs (IN1 and IN2), where they are processed and amplified. The amplified output is delivered to the speakers connected to the OUT1+ and OUT1- terminals for one channel and OUT2+ and OUT2- terminals for the second channel.
Key operational aspects include:
- Standby and Mute Function: The IC includes standby and mute functions that help reduce power consumption when the amplifier is not in use. These features prevent unwanted noise during power-up or shutdown.
- Power Supply Considerations: The amplifier requires a stable DC voltage supply between 12V and 18V for optimal performance. Proper decoupling capacitors (470µF and 100nF) ensure smooth operation by filtering power fluctuations.
- Low Distortion Output: The amplifier is designed to minimize total harmonic distortion (THD), ensuring clear and high-fidelity sound output.
Applications
- Stereo audio amplifier systems
- Home theater systems
- Car audio systems
- Multimedia speaker systems
- Public address (PA) systems
Advantages
- High power output with minimal distortion
- Built-in protection against overheating and overvoltage
- Compact design with minimal external components required
- Efficient power management with standby and mute functions
- High signal-to-noise ratio (SNR) for superior audio quality
Conclusion
The TDA7279 audio amplifier circuit is an excellent solution for high-quality stereo sound applications. Its high efficiency, reliability, and ease of integration make it a popular choice for DIY audio enthusiasts and professional sound engineers. With proper component selection and circuit design, this amplifier can deliver outstanding sound performance in various applications.
