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A Simple DIY Bluetooth Audio Player using Wireless Hi-Fi Amplifier Module

Intermediate

ANALOG / DISCRETE

Project Specific

3 – 6 Hours

Partial Kit

A Simple DIY Bluetooth Audio Player using Wireless Hi-Fi Amplifier Module

Build a portable DIY Bluetooth audio player and music system using a Wireless Hi-Fi 5W amplifier module, lithium-ion battery, and matched speakers.

Originally published on CircuitDigest

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

1200mAh 18650 Li-ion Bat – Reliable 3.7V Power Cell Rs. 129.00
Cable for Arduino Nano (USB 2.0 A to USB 2.0 Mini B) 30cm Rs. 69.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Speaker / Audio Amplifier

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How It Works

This portable DIY audio player functions by combining a wireless Bluetooth audio source with an integrated amplifier module driven by a battery power supply. At the core of the audio subsystem is the Wireless Hi-Fi Bluetooth Amplifier Module, which features the HAA2018 IC. This module receives digital audio streams wirelessly via Bluetooth from a smartphone, tablet, or other enabled transmitter. Alternatively, it can process audio locally if equipped with an auxiliary cable or a USB/TF memory card. The onboard HAA2018 amplifier chip processes the incoming audio signal, boosting its power to drive external transducers. To ensure optimal power transfer and prevent distortion, the system utilizes two 4-ohm 2.5W speakers wired in parallel, matching the amplifier's 2-ohm 5W output impedance specification. The entire electronics assembly is powered by a portable 3.7V lithium-ion battery or a 4V lead-acid battery, making the system completely self-contained. A micro-USB charging cable is used to replenish the battery's energy when depleted. Because the system operates entirely on discrete component integration and module interfacing without requiring programmable microcontrollers, audio playback is managed directly through the hardware controls and the connected input device.

Why Build This

Design and assemble a custom, portable wireless speaker system tailored for practical home or office audio applications.

Gain hands-on engineering experience with impedance matching by wiring speakers in parallel to match an amplifier's specific output requirements.

Integrate lithium-ion battery power management with audio electronics to create a functional, standalone multimedia sound system.

Real-World Application

Portable wireless speakers, custom Bluetooth audio players for home or office use, and DIY multimedia sound systems.

Skills You'll Learn

Audio amplifier impedance matching

wireless module integration

battery power distribution

parallel speaker wiring

portable audio system troubleshooting

Safety Precautions

Take care of positive and negative terminals when connecting the lithium-ion battery. Do not charge the device while actively using it.

Technology Tags

BLUETOOTH

AUDIO AMPLIFIER

HAA2018 IC

FM RADIO

LITHIUM-ION BATTERY

SPEAKER MATCHING

Frequently Asked Questions

Why do the speakers need to be wired in parallel?

Wiring two 4-ohm speakers in parallel results in a combined impedance of 2 ohms, which matches the 2-ohm 5W output specification of the HAA2018 amplifier module for safe and efficient power transfer.

Can I use any type of rechargeable battery for this project?

The project is designed for a 3.7V lithium-ion battery or a 4V lead-acid battery. You must pay strict attention to the positive and negative terminals during connection to prevent damaging the circuit.

Do I need to program any software to make the Bluetooth work?

No software or coding is required. The Bluetooth module operates entirely out-of-the-box through hardware pairing with your audio source device.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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