Description
3W+3W Mini Audio Amplifier Module – 5V Class-D Stereo Board
The PAM8403 Mini Stereo Audio Amplifier Module is a compact Class-D digital amplifier board designed to deliver 3W + 3W stereo output using a simple 3V–5V DC power supply. This small but powerful amplifier module provides high efficiency, low noise, and clear sound performance, making it perfect for portable speakers, DIY electronics projects, and compact audio systems.
Built with efficient Class-D amplification technology, the PAM8403 can drive two stereo speakers directly without requiring a large heat sink. The board features low EMI, thermal protection, and short-circuit protection, ensuring stable and reliable performance even in compact electronic designs.
Its ultra-small size makes it an excellent choice for battery-powered devices, portable speakers, embedded audio systems, and electronics learning projects.
Key Features
• Compact 3W + 3W stereo Class-D amplifier module
• Works with 3V – 5V DC power supply
• High efficiency up to 90%
• Clear sound with low distortion and low noise
• Can directly drive 4Ω or 8Ω speakers
• Filterless design for simplified circuit integration
• Built-in thermal shutdown protection
• Short circuit protection for safety
• Low EMI interference design
• Ultra-compact and lightweight PCB module
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Type | Mini Audio Amplifier Module |
| Amplifier IC | PAM8403 |
| Amplifier Type | Class-D Digital |
| Channels | 2 Channel Stereo |
| Output Power | 3W + 3W |
| Speaker Load | 4Ω / 8Ω |
| Operating Voltage | 3V – 5V DC |
| Maximum Gain | 24 dB |
| Efficiency | Up to 90% |
| Operating Temperature | -40°C to +85°C |
| Protection | Short Circuit, Thermal Shutdown |
| PCB Thickness | 1.6 mm Fiberglass |
| Dimensions | 2.1 × 1.8 × 0.3 cm |
| Weight | ~2 g |
Pin Description
| Pin | Description |
|---|---|
| L | Left Channel Audio Input |
| R | Right Channel Audio Input |
| GND | Ground |
| VDD (+) | 3V–5V Power Supply |
| VDD (-) | Power Ground |
| L+ / L- | Left Speaker Output |
| R+ / R- | Right Speaker Output |
Applications
• DIY portable speaker projects
• Bluetooth speaker builds
• Small stereo audio systems
• Portable electronics audio amplification
• FM radio audio amplifier
• TV audio booster circuits
• Microcontroller audio projects
• Arduino and Raspberry Pi sound projects
• Electronics learning kits
• Battery-powered speaker systems
Precautions
• Use regulated 3V–5V DC power supply only
• Do not exceed 5V input voltage
• Use compatible 4Ω or 8Ω speakers
• Ensure correct polarity of power connections
• Avoid a short circuit between speaker outputs
• Keep the board away from moisture and dust