Bluetooth Speaker DIY Project Kitronik 2182

1. Project Overview

The aim of this project is to build a compact stereo Bluetooth speaker for home or portable use, using:

• a ready-made Bluetooth amplifier module,

• two 3 W full-range speakers,

• battery or USB power,

• a 3D-printed enclosure.

The design focuses on:

• ease of assembly,

• minimal component count,

• full customization of the enclosure (color, front grille, knob).

2. Main Components

2.1 Audio Module

Kitronik 2182 – Bluetooth Stereo Amplifier Module

• Bluetooth version: 4.2

• Output power: 2 × 3 W (4 Ω)

• Supply voltage: 3–5 V DC

• Built-in Class-D stereo amplifier

• Automatic pairing on power-up

• Terminals: L+, L−, R+, R−, VCC, GND

The module is a complete audio solution and does not require an external DAC or amplifier.

2.2 Speakers

• 2 × full-range speakers:

  • Impedance: 4 Ω

  • Rated power: 3 W

  • Diameter: 40–52 mm (recommended for compact enclosures)

2.3 Power Supply

Two possible options:

1. Li-Po battery 3.7 V, 

2. 5 V USB power (power bank or wall adapter)

Battery operation is recommended for portability.

2.4 Additional Components

• Rotary switch 2-positions 2 circuits - 30mm (optional)

• M3 / M2.5 mounting screws

3. 3D-Printed Enclosure Design

3.1 Enclosure Structure

The enclosure consists of:

1. Main body

2. Front panel / grille

3. Rear cover

4. (Optional) volume knob

5. Speakers frame

Design features:

• closed-box construction,

• internal mounts for speakers,

• standoffs for the Kitronik 2182 module,

• ventilation openings for the Class-D amplifier.

3.2 Printing Parameters

• Material: PLA (easy) or PET-G (more durable)

• Layer height: 0.2 mm

• Infill: 15%

• Wall thickness: 2 walls

• Support needed for main body

3.3 Acoustic Considerations

• Internal volume: approx. 0.6–1.0 liters

• Optional acoustic damping:

  • thin foam

  • felt lining

• Front grille openings designed to:

  • avoid airflow restriction,

  • protect speaker cones.

4. Wiring Diagram

4.1 Audio Connections

Speakers are connected directly to the module outputs.

Do not required any soldering

4. Assembly Instructions

1. 3D-print all enclosure parts

2. Mount speakers

3. Secure the Kitronik 2182 module to the standoffs

4. Power wires

5. Install the switch (optional)

6. Place the battery in its holder (double side tape)

7. Close the enclosure with the rear cover

8. Pair the speaker with a phone or computer

5. Pairing and Operation

• The module automatically enters pairing mode when powered on

• Appears as a standard Bluetooth audio device

• Remembers the last connected device

• Volume can be controlled from the audio source

6. Expansion Options

• Battery level indicator

• etc....

7. Project Applications

• Home or desktop speaker

• Internet radio

• DIY gift project

• Educational build

• Custom small-batch product

Estimated cost of all items 20-25 Euros.

Module:

https://botland.store/mp3-wav-ogg-midi-players/23987-bluetooth-stereo-amplifier-module-2x-3w-speaker-kitronik-2182-6609025159744.html

https://botland.store/rotary-switches/6165-rotary-switch-2-positions-2-circuits-30mm-5904422357436.html