5v Bluetooth Audio Receiver Module (SMD small IC)

Key Features

• Ultra-compact Bluetooth stereo audio receiver

• SMD-style low-profile construction

• DC 3.5V–5.5V operating range

• 5V recommended

• Bluetooth version varies by chipset

• Stereo line-level output

• Dedicated Left / Right / Ground connections

• Approx. 10m open-space wireless range

• 
  

  90dB published SNR

• 2.402–2.480GHz Bluetooth frequency range

• Integrated onboard antenna

• Onboard status LED

• Automatic pairing/reconnection functionality

• Approx. 24 × 15 × 1mm size

• Suitable for external audio amplifiers

Technical Specifications

Power Supply

Recommended supply:

5V DC

Published operating range:

3.5V–5.5V DC

Use a clean and stable DC supply for best audio performance.

Bluetooth Version

The exact Bluetooth version can vary according to the chipset used in the supplied production batch.

Possible versions listed for this product include:

• Bluetooth 3.0

• Bluetooth 4.1

• Bluetooth 5.0

Therefore, Bluetooth 5.0 should not be guaranteed unless the current stock chipset is specifically confirmed.

Stereo Audio Output

The module provides three primary audio connections:

L-Out → Left Audio

R-Out → Right Audio

GND / AGND → Audio Ground

These outputs provide a line-level stereo audio signal intended for an external amplifier stage.

Important

This module does not provide high-power speaker output.

For passive speakers:

Bluetooth Module → Audio Amplifier → Speakers

Compatibility

This module is designed to provide a stereo Bluetooth audio source for an external amplifier or compatible analogue audio circuit.

Compatible Audio Sources

It can receive Bluetooth audio from compatible:

• Android smartphones

• iPhones

• Tablets

• Bluetooth-enabled computers

• Other Bluetooth audio-source devices

Compatible Amplifiers

Its line-level stereo output can be integrated with compatible amplifier inputs such as:

• PAM8403

• TPA3110

• TPA3116D2

• TPA3118

• TPA3255

• Other compatible analogue-input amplifier boards

Always verify the input and grounding requirements of the amplifier being used.

Example With PAM8403

For a compact 5V Bluetooth speaker:

Smartphone

↓

Bluetooth Receiver Module

↓

PAM8403 Stereo Amplifier

↓

Left + Right Speakers

This is a practical architecture because both modules can be integrated into a compact low-voltage system when correctly powered.

Example With a High-Power Amplifier

For a larger system:

Smartphone

↓

Bluetooth Receiver Module

↓

TPA3116 / TPA3255 Amplifier

↓

Left + Right Speakers

The Bluetooth receiver still requires a suitable low-voltage power supply within its specified range.

Important — This Is Not an Amplifier

The module provides:

Stereo Line-Level Audio

It cannot directly provide normal speaker-driving power.

Use:

Bluetooth Receiver → Amplifier → Passive Speakers

Power Compatibility

Operating range:

3.5V–5.5V DC

Recommended:

5V DC

If your main amplifier operates at a higher voltage such as:

• 12V

• 24V

• 36V

• 48V

use an appropriate regulator or separate low-voltage supply for the Bluetooth module.

Before Purchase

Function: Bluetooth Audio Receiver

Supply: 3.5V–5.5V DC

Recommended Supply: 5V DC

Output: Stereo L/R Line-Level

Bluetooth Version: Chipset Dependent

Range: Approx. 10m Open Space

Integrated Antenna: Yes

External Amplifier Required: Yes

Direct Passive Speaker Drive: No

Applications

• DIY Bluetooth speakers

• Wireless amplifier upgrades

• Portable audio projects

• Compact speaker systems

• Custom amplifier systems

• Old speaker upgrades

• Audio electronics prototyping

• Custom PCB integration

• Embedded audio systems

• Student projects

• Repair and modification projects

Who Is It For?

• DIY audio builders

• Electronics hobbyists

• Engineering students

• Makers

• Audio technicians

• Repair technicians

• Custom PCB designers

📦 What's Included

❌ What's Not Included

The standard package does not include:

• Audio Power Amplifier

• Speakers

• Battery

• Battery Charger

• Power Adapter

• USB Cable

• Audio Cable

• Volume Control

• Power Switch

• Enclosure

• External Antenna

Important Purchase Note

This product is a:

Bluetooth Stereo Audio Receiver Module

It is not a complete Bluetooth speaker or audio amplifier.

For a basic Bluetooth speaker system, you will generally require:

Bluetooth Receiver Module

Audio Power Amplifier

Left + Right Speakers

Suitable Power Supply

Power Connection

The module is powered through its dedicated PCB power connections.

Recommended supply:

5V DC

Always verify:

Positive Supply + Ground

before applying power.

Audio Connections

The module provides stereo audio through dedicated:

Left + Right + Ground

connections.

These should be connected to the line-level input of a suitable audio amplifier.

📚 Resources

The exact Bluetooth chipset can vary between production batches.

Because of this, a single chipset-specific datasheet should not be assumed for every supplied module.

For integration, follow the markings on the actual PCB supplied.

Getting Started

Step 1 — Identify the Connections

Before soldering, inspect the actual PCB and identify the labelled connections for:

• VCC

• GND

• Left Audio Output

• Right Audio Output

• Audio Ground

Follow the markings on the physical module rather than assuming pad positions.

Step 2 — Prepare a Suitable Power Supply

Published operating range:

3.5V–5.5V DC

Recommended:

5V DC

Use a clean, stable supply.

Step 3 — Connect the Audio Output

Connect the stereo line-level output to the input of a compatible amplifier.

Typical signal arrangement:

L-Out → Amplifier Left Input

R-Out → Amplifier Right Input

Audio Ground → Amplifier Signal Ground

Follow the markings on the actual boards.

Step 4 — Check Power Polarity

Before applying power, carefully confirm:

• Positive supply

• Ground

• No short circuits

• Correct audio connections

Reverse polarity can damage the module.

Step 5 — Apply Power

Power the module using the appropriate DC supply.

The onboard status LED should indicate the module's Bluetooth state.

Exact LED behaviour can vary with chipset revision.

Step 6 — Enable Bluetooth

On your smartphone or other Bluetooth audio source:

1. Open Bluetooth settings.

2. Enable Bluetooth.

3. Search for nearby devices.

Step 7 — Select the Receiver

Select the available Bluetooth receiver.

The exact pairing name may vary depending on chipset revision.

Step 8 — Complete Pairing

Complete the standard Bluetooth pairing process.

Step 9 — Play Audio

Start audio playback from the connected Bluetooth device.

Signal path:

Phone

↓

Bluetooth

↓

Receiver Module

↓

Stereo Line-Level Output

↓

Amplifier

↓

Speakers

Step 10 — Test at Low Volume

Start with the amplifier at a low volume.

Check:

• Left channel

• Right channel

• Audio clarity

• Hum

• Buzz

• Digital noise

• Bluetooth stability

Important Soldering Note

This is a very small SMD-style module.

Use:

• Fine soldering tip

• Controlled temperature

• Minimal solder

• Short contact time

Avoid excessive heat that could damage PCB pads or nearby SMD components.

Important Antenna Note

Keep the antenna area away from:

• Metal enclosure walls

• Large heat sinks

• Transformers

• Dense wiring

This helps maintain Bluetooth performance.

🔧 Prototyping and Engineering Tips from RoboGears

1. Don't Advertise This as Bluetooth 5.0 Only

The exact product specification states:

Bluetooth 3.0 / 4.1 / 5.0 depending on chipset

Therefore, keep the Bluetooth version chipset-dependent unless the current stock is physically verified.

2. Remove the “Lossless Decoding” Claim

The current listing mentions “lossless decoding” and MP3/WAV support.

Those claims are not sufficiently established for this exact chipset-variable module.

A safer description is:

Bluetooth Stereo Audio Receiver Module

Do not imply a verified lossless Bluetooth codec.

3. Use 5V for Normal Projects

Although the published operating range is:

3.5V–5.5V

the product specification recommends:

5V DC

A stable 5V supply is therefore the preferred starting point.

4. Never Connect High Amplifier Voltage Directly

If the amplifier uses:

• 12V

• 24V

• 36V

• 48V

do not connect that voltage directly to this module.

Use a suitable regulated low-voltage supply.

5. Remember — This Is Line-Level Output

The module cannot directly drive normal passive speakers.

Correct architecture:

Bluetooth Receiver → Power Amplifier → Speakers

6. Keep Audio Wiring Short

Long unshielded audio wires can pick up:

• Hum

• Buzz

• Switching noise

• RF interference

Keep L/R/GND wiring short wherever practical.

7. Use Shielded Signal Wiring When Necessary

For longer audio connections, shielded cable can help reduce interference.

8. Add Local Power Filtering if Needed

If digital noise or hum is present when sharing a supply with an amplifier, local power filtering may help.

A capacitor across the module's supply near the PCB can help reduce supply ripple.

Always observe capacitor polarity and voltage rating.

9. Protect the Antenna Area

The module uses an integrated antenna.

Avoid installing the antenna section directly against:

• Metal

• Large heat sinks

• Transformers

• Ground planes that obstruct the antenna area

10. Be Careful While Soldering

At approximately 24 × 15 × 1mm, this is a very small module.

Use controlled soldering temperature and avoid prolonged heat on the pads.

11. Check Polarity Twice

Reverse polarity can permanently damage low-voltage Bluetooth modules.

Verify VCC and GND before power-up.

12. Test Before Permanent Installation

Before installing inside an enclosure, test:

• Pairing

• Reconnection

• Left channel

• Right channel

• Wireless range

• Noise level

• Power stability

Common Mistakes / Troubleshooting

Module Does Not Power On

Check:

• Supply voltage

• VCC connection

• Ground

• Polarity

• Solder joints

Phone Cannot Find the Module

Try:

• Power cycling the module

• Turning phone Bluetooth off/on

• Moving closer

• Disconnecting another paired device

Bluetooth Connects but No Sound

Check:

• Left/right output wiring

• Audio ground

• Amplifier input

• Amplifier power

• Phone volume

• Amplifier volume

Only One Channel Works

Check:

• L-Out connection

• R-Out connection

• Solder joints

• Amplifier channels

Hum or Digital Whine

Possible causes:

• Poor power supply

• Shared supply noise

• Grounding

• Long audio wiring

• Switching interference

Improve filtering, grounding and wiring layout.

Range Is Poor

Check:

• Metal enclosure

• Antenna obstruction

• Wireless interference

• Installation position

• Distance

Engineering Principle

For a clean Bluetooth audio project:

Clean 5V Power + Bluetooth Receiver + Short Signal Wiring + Proper Grounding + Audio Amplifier + Correct Speakers

The receiver handles wireless audio; the amplifier handles speaker power.

FAQ

1. What is this module?

It is an ultra-compact Bluetooth stereo audio receiver module designed to provide wireless audio to an external amplifier.

2. What is the operating voltage?

Published range:

3.5V–5.5V DC

3. What voltage is recommended?

5V DC

4. Can I power it from 3.7V?

3.7V falls within the published operating range.

For normal projects, however, the product specification recommends 5V.

5. Can I power it directly from 12V?

No.

12V exceeds the specified maximum voltage.

Use a suitable regulator.

6. Which Bluetooth version does it use?

The Bluetooth version depends on the chipset supplied.

The current specification lists:

Bluetooth 3.0 / 4.1 / 5.0

7. Is Bluetooth 5.0 guaranteed?

No.

Bluetooth 5.0 should only be guaranteed if the exact current chipset is confirmed.

8. Is the output stereo?

Yes.

The module provides Left and Right audio outputs.

9. What are the audio connections?

The module provides:

Left + Right + Ground

line-level audio connections.

10. Can I connect passive speakers directly?

No.

Use an external audio power amplifier.

11. Can I use PAM8403?

Yes.

A compatible PAM8403 amplifier is a practical choice for a compact low-voltage Bluetooth speaker project.

12. Can I use TPA3116D2?

Yes, as long as the Bluetooth module is supplied with the correct low voltage and its line-level output is correctly connected to the amplifier input.

13. Can I use TPA3255?

Yes, as an audio source for a compatible TPA3255 amplifier.

Do not power the Bluetooth module directly from the TPA3255's high-voltage supply.

14. What is the Bluetooth range?

Published range:

Approximately 10 metres in open space

Actual range depends on obstacles, interference and installation.

15. What is the frequency range?

Published Bluetooth frequency range:

2.402–2.480GHz

16. What is the published SNR?

>90dB

17. What is the current consumption?

The current product specification lists approximately:

30mA–300mA peak

Actual consumption depends on operating conditions and chipset revision.

18. What are the dimensions?

Approximately:

24 × 15 × 1mm

19. Does it have an antenna?

Yes.

An integrated onboard antenna is specified.

20. Does it have a status LED?

Yes.

An onboard status indicator is provided.

21. Does it automatically reconnect?

The current product description specifies automatic pairing/reconnection behaviour.

Exact behaviour may depend on chipset revision and the previously paired device.

22. Does it have a USB port?

The current small-IC version is designed around PCB power/audio pads rather than an onboard USB power connector.

23. Does it have buttons?

No onboard control buttons are specified for this compact version.

24. Does it have a 3.5mm AUX jack?

No onboard 3.5mm jack is specified.

Audio is provided through the module's PCB connections.

25. Is it a Bluetooth transmitter?

No.

This product is intended as a Bluetooth audio receiver.

26. Can I transmit TV audio to Bluetooth headphones with it?

No.

That application requires a Bluetooth audio transmitter.

27. Can I use it to add Bluetooth to an old amplifier?

Yes.

Connect its line-level stereo output to a compatible amplifier input.

28. Can I make a Bluetooth speaker with it?

Yes.

Typical architecture:

Phone → Bluetooth Receiver → Amplifier → Speakers

29. Does it decode MP3 and WAV files directly?

The current page mentions MP3/WAV decoding, but the exact chipset varies and no local storage interface or verified decoder documentation is provided.

Therefore, direct MP3/WAV file-decoder capability should not be guaranteed.

30. Is Bluetooth audio lossless?

A verified lossless Bluetooth codec is not documented for this product.

Do not advertise guaranteed lossless Bluetooth transmission.

31. Why does my module produce humming or whining?

Possible causes include:

• Noisy power supply

• Shared amplifier supply

• Grounding problems

• Long signal wiring

• Switching interference

Improve power filtering, grounding and signal wiring.

32. Can I install it inside a metal enclosure?

A metal enclosure can reduce Bluetooth range.

Keep the integrated antenna area near a non-metallic opening where possible.

33. What is included?

1 × 5V Bluetooth Audio Receiver Module – SMD Small IC

34. Is an amplifier included?

No.

35. Are speakers included?

No.

36. Is a power supply included?

No external power supply is specified as included.

Important Note

This module provides a stereo line-level Bluetooth audio signal.

An external audio power amplifier is required to drive normal passive speakers.

Disclaimer

Bluetooth version, chipset, pairing name, LED behaviour and minor PCB details may vary between production batches.

Where a project depends on a specific Bluetooth version or chipset feature, verify the actual module revision before installation.