PAM8403 - GF1002 3W Stereo Audio Amplifier Module

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PAM8403 is a filterless 3W, class-D, two-channel audio amplifier integrated circuit. The PAM8403-GF1002 Audio amplifier module features high efficiency, high quality audio outputs with low harmonic distortion THD+N, has a Manual volume control switch. The operating voltage for this module range from 2.5 V to 5.5 V. It is the right choice for your MP3 and MP4 player projects.

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PAM8403-GF1002 module Specification

The quick specification of PAM8403-GF1002 audio amplifier module:
  • Type: Class-D
  • Model: PAM8403-GF1002
  • Dimensions: 29.5 x 20.2 x 15mm
  • Operating Voltage: 2.5 V to 5.5 V
  • Output Channel: 2x
  • Output Power: 3 W + 3 W (at 4 ohm)
  • High Amplification Efficiency: 85%

PAM8403-GF1002 module Circuit diagram

Schematic of the PAM8403 GF1002 3w class-D stereo audio amplifier module circuit shown below.


Working principle of PAM8403-GF1002

GF1002 module is a 3W Class-D 2-channel audio amplifier with a Manual volume control switch. Inside the module IC PAM8402 Amplifier chief installed, offers low THD+N, allowing it to achieve high quality sound reproduction. The filterless architecture of this IC allows the device to drive the speaker directly from IC Pins no. (1, 3) (14, 16). So no low-pass output filter is required for the module GF1002.


With the same numbers of external components, the efficiency of the PAM8403 IC is much better than that of Class-AB cousins. IC XH-M228 is the alternatives for PAM8403.

As shown in the circuit diagram Pin-7 and Pin-10 are used for the left and right channels of audio input. These pins are connected through a separate 0.47µf (474) ceramic capacitor to reduce noise caused by the power supply coupling into the output drive signal.

A 50KΩ Manual volume control switch controls the GF1002 module's output audio signal.

The recommended operating voltage for the PAM8403 GF1002 audio amplifier module circuit is a minimum of 2.5 V and a maximum of 5.5 V.

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PAM8403-GF1002 module Connection diagram

PAM8403 GF1002 3W Two Channel Audio Amplifier Module Connection Diagram
Connection diagram of the PAM8403 GF1002 3w stereo audio amplifier module.

Applications of PAM8403 module

  • LCD Monitors / TV Projectors
  • Notebook Computers
  • Portable Speakers
  • Portable DVD Players, Game Machines
  • Cellular Phones/Speaker Phones

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