Compact, easytoinstall PAM8403 mini digital audio amplifier board (Model A156) — delivers four channels of clean audio at 3W per channel from a single 5V supply. Supplied as 1pc with speaker cable for quick hookup. Why you need it Add reliable amplification to small speaker projects without bulky power supplies or complex wiring. Drive multiple small speakers or biamp a stereo system from a single compact board. Simple integration for hobbyist builds, repairs, prototypes, and compact audio setups. Key benefits Multichannel output: Four independent channels (3W × 4) let you power multiple drivers or build small 2.1/4driver systems without extra amplifiers. Lowvoltage operation: Runs from a single 5V power source — ideal for USB power banks, singleboard computers, and portable projects. Readytouse: Includes speaker cable for faster installation and testing. Compact form factor: Mini board design saves space in enclosures and portable builds. Main features and specifications Model: A156 Amplifier chip: PAM8403 (digital audio amplifier) Channels: 4 channels Output power: 3W per channel (3W × 4) Supply voltage: 5V DC Package: 1pc mini amplifier board with cable for speaker Form: Printed circuit board (compact, mini) Functionality and compatibility Function: Amplifies lowlevel audio input to drive passive speakers across four channels. Compatible with any linelevel audio source and a 5V DC power supply. Suitable for small passive speakers rated for similar power levels and applications where compact, lowvoltage amplification is needed. Typical use cases DIY portable speakers: Build a compact multidriver Bluetooth or wired speaker powered from a USB power bank and a small audio source. Desktop or multimedia audio: Upgrade PC or Raspberry Pi audio by powering multiple small drivers for improved soundstage without adding bulky amps. Prototyping and education: Ideal for electronics projects, classroom demonstrations, and quick prototyping where multiple outputs and lowvoltage operation are required. Installation notes and tips Connect a stable 5V DC supply to the board before applying audio input. Use the included speaker cable to connect passive speakers to the output terminals. Match speaker power handling to the amplifier's 3W per channel rating for results. Keep wiring neat and secure to avoid shorts; mount the mini board in a ventilated area inside enclosures. What's included 1 × PAM8403 mini digital audio amplifier board (Model A156) Speaker cable for connection to passive speakers This A156 PAM8403 mini amplifier board provides a compact, practical solution for adding fourchannel, lowvoltage amplification to hobbyist and smallscale audio projects while keeping installation and power requirements simple.