PAM8403 Super mini digital amplifier board 2 * 3W Class D digital amplifier board efficient 2.5 to 5V USB power supply – KSH 400 at HIMASTORES Mombasa – best electronics in Kenya
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PAM8403 Super mini digital amplifier board 2 * 3W Class D digital amplifier board efficient 2.5 to 5V USB power supply

SKU: HMJ626 Category: Amplifiers
KSH 400.00
In Stock

Product Description

PAM8403 Super Mini Digital Amplifier Board 2 x 3W

High-Efficiency Class D Stereo Amplifier Module

The PAM8403 is a ultracompact digital Class D amplifier board that delivers 2 x 3W stereo output with high efficiency, making it perfect for portable and batterypowered audio projects [citation:1][citation:2][citation:3]. Operating from a 2.5V to 5V power supply, it can be powered directly from a USB port, power bank, or lithium battery [citation:5][citation:9].

High efficiency: up to 90% - no heat sink required
Ideal for portable speakers, DIY audio, and embedded projects
Maximum supply voltage: 5.5V - exceeding this will damage the IC

Technical Specifications

ParameterValue
Channel Output2 x 3W (stereo) [citation:6]
Power Supply2.5V - 5.5V DC [citation:1][citation:6]
Recommended Supply5V USB / 3.7V Li-Po [citation:10]
Speaker Impedance4Ω - 8Ω (4Ω recommended) [citation:1]
Efficiency>90% (Class D) [citation:6][citation:8]
SignaltoNoise Ratio90dB [citation:6]
PCB Size~21 x 18 x 3.4mm [citation:1][citation:9]

= Key Features =

UltraCompact Tiny footprint fits into any portable device or DIY project [citation:1][citation:2]

USB Powered - Easily powers from computer USB, power banks, or phone chargers [citation:5][citation:11]

High Efficiency - 90% efficiency means cool operation without bulky heat sinks [citation:6][citation:8]

Excellent Noise Suppression Builtin noise cancellation circuits for clear audio [citation:1][citation:10]

Filterless Design - Unique Class D design with LC filter saves space and cost [citation:1][citation:8]

Stereo Output - 3W + 3W delivers balanced stereo sound [citation:3][citation:6]

Protection Features Shortcircuit overcurrent and overtemperature protection [citation:1][citation:11]

= Applications =

  • Portable speakers and Bluetooth speakers [citation:8][citation:9]
  • DIY audio projects and hobbyist amplifiers [citation:4][citation:5]
  • USB-powered audio devices [citation:1][citation:2]
  • Battery-powered portable electronics [citation:10]
  • Laptop, monitor, and TV audio [citation:1][citation:3]
  • Game consoles and speakerphones [citation:1]
  • Headphone amplifiers and projects [citation:4]

Wiring Guide

ConnectionTerminalDescription
Power InputVCC / GND2.5V - 5.5V DC (Red/Black)
Audio InputL+ / L-Left Channel (Pink/White)
Audio InputR+ / R-Right Channel (Pink/White)
Speaker OutputL+ / L-Left Speaker (Yellow/Black)
Speaker OutputR+ / R-Right Speaker (Yellow/Black)

> The output is CMOS BTL drive mode - all 4 wires are completely independent [citation:6]

Left and right speaker output negatives must NOT be connected together or it will burn the IC [citation:1][citation:3]

How It Works

  1. The PAM8403 is a digital Class D amplifier that switches at a high frequency to achieve up to 90% efficiency [citation:6]
  2. At 5V power supply, each channel delivers 3W output into a 4Ω load [citation:1]
  3. The filterless design reduces component count, making it ideal for compact designs [citation:8]
  4. Excellent noise suppression ensures no hiss, even with ears close to the speaker [citation:1][citation:2]
The IC uses pulse-width modulation to amplify audio efficiently
Class D is recommended over Class A/B because it does not need heat sinks and takes less space [citation:1]
The module is suitable for batterypowered and USBpowered applications only - not for mains AC power [citation:10]

Why Choose PAM8403?

Tiny size fits any DIY or portable project
Runs directly from USB without special power supplies
High 90% efficiency reduces battery drain [citation:6][citation:8]
No heat sink needed for normal operation [citation:10]
Excellent sound quality with low noise
Overcurrent and overtemperature protection [citation:1][citation:11]

√ Works with 5V USB power, power banks, and lithium batteries [citation:1][citation:12]

√ Directly drives 4Ω and 8Ω speakers with clarity

√ No LC filter required for most applications [citation:8]

√ Perfect for audio, robotics, and DIY projects

√ Cost-effective and easy to integrate

√ Simple 2.5V-5V power supply compatibility

Important Safety Notes

Maximum supply voltage 5.5V DC - exceeding this damages the IC [citation:1][citation:6]
Do not connect the left and right channel output negatives together [citation:1][citation:3]
Always connect speakers before applying power [citation:1][citation:10]
Use shielded wire for audio input to reduce interference [citation:6]
Do not reverse power supply polarity [citation:6]
For best results, use a clean 5V power supply capable of at least 800mA [citation:10]
Recommended input current: 800mA for full 3W output power [citation:10]

The PAM8403 Super Mini Digital Amplifier Board delivers powerful stereo sound in a footprint smaller than a matchbox. Perfect for portable speakers, DIY audio, and batterypowered projects, it's the ideal choice for highquality audio in compact spaces.

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