Project Hub /Automotive EV & Transportation/EV Battery Management System (BMS)/Portable 15-Watt PA System With Battery Management

Intermediate

ANALOG / DISCRETE

Project Specific

3 – 6 Hours

Partial Kit

Portable 15-Watt PA System With Battery Management

Build a low-cost, portable 15-watt public address (PA) system utilizing modular audio amplifiers and an integrated lithium-ion battery management system.

Originally published on ElectronicsForU

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.

MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
1200mAh 18650 Li-ion Bat – Reliable 3.7V Power Cell Rs. 129.00
Microphone module - Analog Sound Sensor Module for Arduino Rs. 63.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Speaker / Audio Amplifier

Browse all components

How It Works

This portable public address system functions by converting acoustic sound waves into electrical signals, amplifying those signals, and driving a 15W speaker entirely from a self-contained rechargeable power source. A dynamic microphone captures the user's voice and routes the signal through a 6.5mm mono microphone female socket into the amplification stage. The system relies on modular amplification components, utilizing an LM386 audio amplifier module and a TDA2030A audio amplifier module to boost the weak microphone signals up to a level capable of driving the speaker with sufficient volume and clarity. Power is supplied by a bank of three 3.7V 18650 lithium-ion batteries connected in a 3S configuration to yield a nominal 11.1V to 12V DC output. To ensure reliable and safe operation, a 3S 10A 12V 18650 lithium-ion battery charger protection module is integrated into the power architecture. This BMS module manages the charging cycle and protects the cells from overcharge, over-discharge, and short-circuit conditions, making the entire acoustic amplifier completely portable and independent of AC wall power.

Why Build This

Design a self-powered, portable sound reinforcement node suitable for small-scale public gatherings and outdoor announcements without grid access.

Integrate discrete analog audio amplifier modules with a multi-cell lithium-ion battery management system to analyze DC power delivery in mobile electronics.

Evaluate system-level power budgeting by matching a multi-cell 12V battery architecture with appropriate audio drive stages and a 15W speaker load.

Real-World Application

Portable public address systems are useful for small public gatherings, announcements, portable sound reinforcement, and events where AC mains power is unavailable.

Skills You'll Learn

analog audio amplifier integration

battery management system wiring

DC power distribution

impedance matching for speakers

signal routing

Safety Precautions

Exercise care when working with lithium-ion batteries and battery management systems to avoid short circuits and deep discharges.

Frequently Asked Questions

Why is a 3S battery protection module necessary for this project?

The 3S 10A module monitors the three 18650 lithium-ion cells to prevent over-charging, excessive discharging, and short circuits, which is critical for safe portable power management.

Can I use just the LM386 or just the TDA2030A for the amplifier stage?

The project design incorporates both modules to properly scale the audio signal path from the dynamic microphone up to the power requirements of a 15W speaker.

Does this PA system require any programming or software configuration?

No, this is a purely analog hardware project with no software or microcontrollers required.

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.

PRJ-00553