Mic Connection with PAM8403 5V Audio Amplifier Circuit

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Project Overview

In this project, we will learn how to connect an electric condenser microphone with a PAM8403 audio amplifier module to build a mini sound amplification system. This simple circuit is powered by 5V DC and is perfect for beginner electronics learners and hobbyists.

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Materials for the Project

1. PAM8403 Stereo Audio Amplifier Module (5V DC)

2. Electric Condenser Microphone

3. Electrolytic Capacitor – 470 µF (16V)

4. Resistor – 10k ohm

5. 5V DC Power Source (USB, Battery, or Adapter)

6. Two Mini Speakers (Left & Right output)

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Circuit Description:

1. Microphone Section:

   • The electric mic captures sound waves and converts them into analog electrical signals.

   • The 470 µF capacitor is connected in series to filter DC and pass only the audio signal.

   • A 10k ohm resistor is used to bias the mic from the 5V power line.

2. Amplifier Module (PAM8403):

   • The filtered signal from the mic is fed to the input pin (L-IN) of the PAM8403.

   • The module amplifies this audio signal and sends it to the connected left and right speakers.

3. Power Supply:

   • The amplifier operates at 5V DC, which makes it ideal for USB or portable battery-powered projects.

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Download Circuit Diagram

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Features:

• Low power consumption (only 5V required)

• Stereo output for better sound experience

• Compact and suitable for portable or DIY audio projects

• Perfect for intercoms, voice-controlled systems, Arduino sound input, and more

Applications:

• DIY Bluetooth Speakers

• Audio Intercom System

• Voice Playback or Recording

• Mini Audio Amplifier Projects

• Basic Sound Detection Systems

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For more DIY electronics circuits and tutorials, keep visiting SekhoHub.online—Pakistan’s growing platform for electronics learners and makers.