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Bluetooth speaker Speaker build detail
Audio·Jan 1, 2022
DIY Portable Bluetooth Speaker
A handmade portable speaker — Bluetooth module, Class-D amp, Li-ion pack, custom enclosure.
Overview
A weekend project that grew into a couple of weekends. A Bluetooth audio module, a small Class-D amplifier, a pair of drivers, a Li-ion pack and an enclosure I kept tuning until it actually sounded reasonable.
Specifications
RoleProduct builder and electronics integrator
ModulesBluetooth audio moduleClass-D amplifierSpeaker driversBattery pack
ProtocolsBluetoothAnalog audio
Tech tagsBluetooth AudioClass-D AmplifierBattery PoweredSpeaker Design
Architecture
Bluetooth module receives audio, feeds the amplifier, and the battery system powers the module and speaker drivers.
Project photos
Implementation details
Power
Battery and amplifier power paths are arranged for portable use with attention to charging and runtime.
Components / BOM
Bluetooth audio module, Class-D amplifier, Speaker drivers, Li-ion battery pack, Enclosure
Engineering challenges
Trading off sound quality, runtime, enclosure size and wiring noise — the classic small-speaker problem.
Solutions
Standard audio modules with a portable power system and a hand-built enclosure tuned by ear.
Results & metrics
A working portable speaker that I happily took to a few outdoor evenings.
Future improvements
Battery-level indicator, USB-C charging, a passive radiator for low end, and a better-finished enclosure.