PAM8403 Audio Amplifier with Volume Control

Product Overview
The PAM8403 Audio Amplifier with Volume Control is a compact, efficient Class-D amplifier designed for high-quality audio amplification in portable speakers, DIY audio projects, and multimedia devices. Featuring built-in volume control and a 3W output per channel, this amplifier delivers clear, distortion-free sound while maintaining low power consumption. Its 5V operation and simple interface make it ideal for integration with Arduino, Raspberry Pi, and other microcontroller-based systems.

Key Features

• Dual-Channel Output: 3W per channel at 4Ω (5V) for stereo sound.
• Efficient Class-D Design: >90% efficiency with minimal heat generation.
• Built-In Volume Control: Adjustable via potentiometer or external PWM signal.
• Wide Voltage Range: Operates on 2.5V–5.5V DC (USB-compatible).
• Low Noise: THD <1% at 1W output for crisp audio.
• Compact Size: PCB dimensions 20mm x 15mm for space-constrained projects.
• Compliance: RoHS and CE certified.

Technical Specifications

• Output Power: 3W x 2 (4Ω, 5V)
• THD+N: <0.5% (1W, 1kHz)
• Frequency Response: 20Hz–20kHz (±3dB)
• Input Impedance: 30kΩ
• Signal-to-Noise Ratio: ≥70dB
• Operating Temperature: -40°C to +85°C
• Input Voltage: 2.5–5.5V DC
• Connectors: 3.5mm audio jack, terminal blocks for power/speakers

Benefits

• Plug-and-Play: No external components needed for basic operation.
• Portable: Ideal for battery-powered devices (e.g., Bluetooth speakers).
• Cost-Effective: Affordable solution for high-fidelity audio.
• Easy Customization: Adjust gain and bass/treble via external circuits.
• Durable: Short-circuit and over-temperature protection.

Usage Instructions

1. Power Connection: Wire +5V to VCC, GND to ground.
2. Audio Input: Connect audio source to 3.5mm jack or terminals.
3. Volume Adjustment: Rotate potentiometer or send PWM signal to control pins.
4. Speaker Output: Attach 4Ω–8Ω speakers to L/R output terminals.
5. Testing: Power on and adjust volume to desired level.

Safety & Storage

• Handling: Avoid short-circuiting speaker outputs.
• Storage: Keep in anti-static packaging, away from moisture.
• Operational Limits: Do not exceed 5.5V or connect speakers <4Ω.
• Heat Management: Ensure adequate ventilation in enclosed spaces.

Applications

• Portable Bluetooth/Wi-Fi speakers
• DIY audio amplifiers and guitar pedals
• Educational electronics kits
• Multimedia devices and gaming consoles
• Public address (PA) systems and intercoms

Why Choose the PAM8403 Amplifier?
Combining power efficiency, crystal-clear audio, and user-friendly design, the PAM8403 is a versatile choice for hobbyists and engineers. Its integrated volume control, compact footprint, and compatibility with low-voltage systems simplify audio projects while delivering professional-grade sound quality. Whether enhancing a DIY speaker or prototyping an IoT device, this amplifier ensures reliable performance without compromise.