TDA2007A 6+6W Stereo Audio Amplifier Circuit

Introduction:

The TDA2007A is a Class AB dual audio power amplifier designed for stereo applications in audio systems such as music centers, TV receivers, and portable radios. Manufactured by STMicroelectronics, this IC is housed in a 9-pin Single In-Line Package (SIP9) and is optimized for delivering 6W per channel with low distortion and high efficiency.

Operating with a supply voltage range of 8V to 24V, the TDA2007A features high output power, high current capability, and built-in protections such as AC short circuit protection and thermal overload protection, ensuring reliability in various applications. It supports a closed-loop gain of 36dB, making it suitable for high-fidelity audio amplification.

The IC can be configured in stereo or bridge mode, where it can output up to 12W in a single-channel setup. Due to its low external component requirement, the TDA2007A is widely used in compact audio amplifier designs for consumer electronics.

Component Details:

S.no	Components	Value	Qty.
1.	Audio IC	TDA2007A	1
2.	Resistor	1KΩ, 18Ω, 1Ω	1,1,1
3.	Capacitor	100uf,22uf,2.2uf, 220uf,2200uf,0.1uf	1,1,2,2,2,2
4.	Speaker	4Ω-8Ω	2
5.	DC Power	8 – 24V	1
6.	Audio Input	–	–

Pinout of TDA2007A:

Schematic

Explanation of the TDA2007A Audio Amplifier Circuit

This circuit is a stereo audio amplifier based on the TDA2007A IC, which is a dual power amplifier designed for driving speakers in audio applications. It can operate with a voltage supply between 8V to 24V and is ideal for low to medium power audio amplification.

Main Sections of the Circuit:

1. Power Supply Section:
   • The amplifier is powered by a single DC voltage supply ranging from +8V to +24V.
   • Capacitors C3 (22uF), C4 (0.1uF), and C5 (100uF) help stabilize the power supply, filter noise, and prevent voltage fluctuations.
2. Input Section:
   • Left Input (L Input) and Right Input (R Input) are the two audio signal inputs.
   • Capacitors C1 (2.2uF) and C2 (2.2uF) block DC components and allow AC (audio) signals to pass.
   • These capacitors prevent distortion and protect the amplifier from unwanted DC signals.
3. TDA2007A Amplification Section:
   • The TDA2007A IC has two independent amplifier channels (one for each speaker).
   • Pin 5 and Pin 1 receive the left and right audio inputs, respectively.
   • Pin 3 and Pin 8 are connected to the positive power supply.
4. Gain and Feedback Network:
   • Capacitors C6 (220uF) and C9 (220uF), along with resistors R2 (18Ω) and R5 (18Ω), set the gain of the amplifier.
   • Resistors R1 (1kΩ), R6 (1kΩ), R3 (1Ω), and R4 (1Ω) form a feedback loop, stabilizing the amplification and improving sound quality.
   • Capacitors C7 (0.1uF) and C10 (0.1uF) help to remove high-frequency noise and enhance stability.
5. Output Section:
   • Capacitors C8 (2200uF) and C11 (2200uF) are used for DC blocking, ensuring only the amplified AC signal reaches the speakers.
   • The left and right speaker outputs (L SPK and R SPK) are connected at the output stage.
6. Grounding:
   • The GND (ground) connections at Pin 6 and other points ensure proper reference voltage and stability.
   • Proper grounding is essential to prevent noise and interference.

Working of the Circuit:

1. The audio signals from the left and right channels are fed into Pin 5 and Pin 1 of the TDA2007A IC.
2. These signals are amplified through the internal operational amplifiers inside the TDA2007A.
3. The gain is controlled using the external capacitors and resistors in the feedback network.
4. The amplified signals are passed through DC blocking capacitors (C8 and C11) to the left and right speakers (L SPK & R SPK).
5. The output speakers reproduce the amplified audio signal.

Applications:

• Home audio systems
• Portable speaker systems
• TV sound amplifiers
• DIY audio amplifier projects