5v Bluetooth Audio Receiver Module SMD Big IC

Key Features

• Bluetooth wireless audio receiver module

• Bluetooth 4.1 / 5.0 depending on chipset revision

• 3.7V–5V DC operating range

• Stereo line-level audio output

• Left + Right audio channels

• Approx. 10–15m line-of-sight range

• A2DP Bluetooth audio support

• Automatic reconnection

• Onboard status LED

• Compact SMD-friendly design

• Approx. 30 × 20mm size

• Suitable for DIY Bluetooth speakers

• Suitable for external amplifier boards

• Suitable for portable audio projects

• No onboard speaker power amplifier

Technical Specifications

Bluetooth Profiles

The current RoboGears listing specifies support for:

• A2DP

• AVRCP

• HFP

• HSP

Actual profile functionality can depend on the chipset revision supplied.

Audio Output

The module provides:

Left Audio + Right Audio + Ground

as a stereo line-level signal.

This output should normally be connected to:

• Audio amplifier input

• Pre-amplifier input

• Powered audio system

• Compatible headphone-amplifier stage

It should not be treated as a high-power speaker output.

Power Supply

Supported supply range:

3.7V–5V DC

Possible power sources include:

• Regulated 5V supply

• Compatible 3.7V lithium-cell system

• Suitable low-noise regulated supply

Do not exceed the specified supply range.

Bluetooth Version Note

The supplied module may use:

Bluetooth 4.1 or Bluetooth 5.0

depending on the available chipset/manufacturing batch.

Customers who require one specific Bluetooth chipset or version should verify the current stock before ordering.

Compatibility

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

Compatible Amplifier Boards

The stereo line-level output can be used with compatible amplifier boards such as:

• PAM8403 stereo amplifier

• TPA3110 stereo amplifier

• TPA3116D2 stereo amplifier

• TPA3255 stereo amplifier

• Other compatible analogue-input amplifier boards

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

Smartphone Compatibility

The receiver can be paired with compatible Bluetooth audio-source devices including:

• Android smartphones

• iPhones

• Tablets

• Bluetooth-enabled computers

• Other Bluetooth audio sources

Power Compatibility

Operating range:

3.7V–5V DC

For stationary projects, a clean regulated:

5V DC supply

is a practical choice.

For portable projects, a compatible:

3.7V lithium-cell power system

may be used when properly designed.

Important — This Is Not an Amplifier

The module provides:

Line-Level Stereo Audio

It does not provide high-power speaker output.

Therefore:

Bluetooth Module → Passive Speaker

is generally incorrect.

Use:

Bluetooth Module → Audio Amplifier → Passive Speakers

Example With PAM8403

Smartphone

↓

Bluetooth Receiver

↓

PAM8403 3W+3W Amplifier

↓

Left + Right Speakers

This creates a compact 5V Bluetooth speaker architecture.

Example With a High-Power Amplifier

Smartphone

↓

Bluetooth Receiver Module

↓

TPA3116 / TPA3255 Amplifier

↓

Left + Right Speakers

The Bluetooth receiver requires its own suitable 3.7V–5V supply arrangement.

Shared Power Supply Compatibility

The Bluetooth module and amplifier may sometimes share a power source when their voltage requirements are compatible.

However, switching noise and ground-loop issues can introduce:

• Buzz

• Hum

• Whine

• Digital interference

Power filtering or separate regulated supplies may be beneficial when noise occurs.

Required for a Working Bluetooth Speaker

You will generally need:

• Bluetooth receiver module

• Audio amplifier

• Compatible speakers

• Power supply

• Audio wiring

• Power wiring

Optional:

• Battery

• Battery charger/protection

• Volume control

• Power switch

• Enclosure

Before Purchase

Function: Bluetooth Audio Receiver

Supply: 3.7V–5V DC

Output: Stereo Line-Level Audio

Speaker Amplifier: Not included

Bluetooth: 4.1 / 5.0 depending on revision

Range: Up to approx. 10–15m line of sight

Direct Passive Speaker Drive: No

Applications

• DIY Bluetooth speakers

• Wireless amplifier upgrades

• Portable speakers

• Home audio projects

• Old speaker upgrades

• Custom amplifier systems

• Car audio experiments

• Desktop audio

• Wireless headphone-amplifier projects

• Electronics prototyping

• Custom PCB integration

• Student audio projects

Who Is It For?

• DIY audio builders

• Electronics hobbyists

• Engineering students

• Makers

• Speaker builders

• Repair technicians

• Audio experimenters

📦 What's Included

❌ What's Not Included

The standard module does not include:

• Audio Power Amplifier

• Speakers

• Battery

• Battery Holder

• Battery Charger

• 5V Power Adapter

• USB Cable

• Audio Cable

• Volume Control

• Power Switch

• Enclosure

• External Antenna

Important Purchase Note

This product is a:

Bluetooth Audio Receiver Module

and not a complete Bluetooth speaker.

For a basic DIY Bluetooth speaker:

Bluetooth Receiver

Audio Amplifier

Speakers

Power Supply

are required.

No Onboard Speaker Amplifier

Do not connect normal passive speakers directly to the line-level audio output.

Use a suitable audio power amplifier between the Bluetooth module and speakers.

Product Variation

The Bluetooth chipset may vary between manufacturing batches.

As a result, the following may also vary slightly:

• Bluetooth version

• Bluetooth pairing name

• PCB colour

• IC markings

• LED behaviour

• Component placement

• Minor PCB layout details

The supplied product will maintain the intended Bluetooth stereo audio-receiver functionality.

📚 Resources

The exact Bluetooth chipset may vary between manufacturing batches.

For this reason, a chipset-specific programming or datasheet resource should not be assumed unless the IC marking on the supplied module is first confirmed.

Getting Started

Step 1 — Identify the PCB Connections

Before soldering, inspect the markings on the actual module.

Identify:

• VCC / Positive Supply

• GND

• Left Audio

• Right Audio

• Audio Ground where applicable

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

Step 2 — Select the Power Supply

The module operates from:

3.7V–5V DC

A clean regulated 5V supply is recommended for many stationary projects.

Step 3 — Connect the Audio Output

Connect the module's stereo line-level output to the input of a compatible audio amplifier.

Typical signal connections are:

L → Amplifier Left Input

R → Amplifier Right Input

GND → Amplifier Signal Ground

Follow the markings on both boards.

Step 4 — Keep the Amplifier Volume Low

Before initial power-up, reduce the amplifier or source volume.

Step 5 — Apply Power

Apply a suitable:

3.7V–5V DC

supply to the Bluetooth module.

The onboard LED should indicate Bluetooth status.

Exact LED behaviour may vary with chipset revision.

Step 6 — Enable Bluetooth

On your smartphone:

1. Open Bluetooth settings.

2. Turn Bluetooth on.

3. Search for nearby devices.

Step 7 — Select the Receiver

Select the Bluetooth receiver from the available-device list.

The exact pairing name can vary between manufacturing batches.

Step 8 — Complete Pairing

Complete the normal Bluetooth pairing process.

Step 9 — Start Audio Playback

Play music from the connected Bluetooth device.

The signal path is:

Phone

↓

Bluetooth Receiver

↓

Stereo Line Output

↓

Audio Amplifier

↓

Speakers

Step 10 — Increase Volume Gradually

Increase amplifier/source volume gradually and check for:

• Clean left-channel output

• Clean right-channel output

• Hum

• Buzz

• High-frequency whine

• Distortion

If You Hear Power-Supply Noise

Shared power supplies between digital Bluetooth circuits and audio amplifiers can sometimes create noise.

Try:

• Shortening audio wires

• Using shielded signal wiring

• Improving grounding

• Adding local power-supply filtering

• Separating noisy power paths

• Using a dedicated regulated supply where necessary

Simple 5V Bluetooth Speaker

5V Supply

↓

Bluetooth Receiver + PAM8403

↓

Left + Right Speakers

Both modules must be wired according to their individual voltage and grounding requirements.

High-Power Bluetooth Amplifier

Bluetooth Receiver

↓

High-Power Stereo Amplifier

↓

Speakers

When the amplifier operates at a higher voltage, provide the Bluetooth module with a separate regulated 3.7V–5V supply or suitable voltage regulator.

🔧 Prototyping and Engineering Tips from RoboGears

1. Remember — This Is a Line-Level Receiver

The most important point is:

This module is not an audio power amplifier.

Its output is intended to feed an amplifier input.

2. Pair It With PAM8403 for Compact 5V Projects

For a small DIY Bluetooth speaker, a practical architecture is:

5V Supply → Bluetooth Receiver + PAM8403 → Speakers

This keeps the project compact and allows both boards to operate from a low-voltage system.

3. Use a Regulator With High-Voltage Amplifiers

If your amplifier uses:

• 12V

• 24V

• 36V

• 48V

do not connect that supply directly to this Bluetooth receiver.

Use a suitable regulated 3.7V–5V supply for the receiver.

4. Keep Audio Wiring Short

Long unshielded signal wires can pick up:

• Hum

• Switching noise

• RF interference

Keep the Left, Right and Ground signal paths reasonably short.

5. Use Shielded Cable When Necessary

For installations with longer audio wiring or electrically noisy equipment, shielded cable can improve noise performance.

6. Shared Power Supplies Can Create Whine

Bluetooth receivers contain digital/RF circuitry.

When sharing a supply with an amplifier, digital switching noise can sometimes enter the audio path.

If this occurs, improve:

• Power filtering

• Grounding

• Wiring layout

• Supply regulation

7. Add Local Supply Decoupling

A suitable capacitor across the Bluetooth module's supply close to the PCB can help reduce supply noise.

The current RoboGears listing suggests approximately:

100µF across VCC and GND

as a troubleshooting measure for supply-related whine.

Observe correct capacitor polarity.

8. Avoid Ground Loops

Keep the audio ground arrangement clean and avoid unnecessary long ground paths.

Poor grounding can cause audible:

• Hum

• Buzz

• Digital noise

9. Keep the Bluetooth Area Clear

For better wireless performance, avoid completely surrounding the receiver with:

• Metal

• Large heat sinks

• Shielding

• Dense wiring

These can reduce Bluetooth range.

10. Do Not Guarantee One Bluetooth Version Across All Batches

The current product is supplied with varying chipset revisions.

Therefore, advertise it as:

Bluetooth 4.1 / 5.0 depending on chipset revision

rather than guaranteeing Bluetooth 5.0 for every unit.

11. Test Before Installing Permanently

Before placing the module inside a speaker cabinet, test:

• Pairing

• Automatic reconnection

• Left audio

• Right audio

• Range

• Noise

• Power stability

12. Use an External Volume Control if Needed

If the final amplifier does not provide volume adjustment, use:

• Smartphone volume

• Amplifier volume

• External stereo potentiometer/pre-amplifier

depending on the project architecture.

Common Mistakes / Troubleshooting

Module Does Not Power On

Check:

• Supply voltage

• Supply polarity

• Ground connection

• Solder joints

Supply must remain within the specified range.

Bluetooth Device Cannot Find It

Try:

• Power cycling the module

• Turning phone Bluetooth off/on

• Moving closer

• Disconnecting another previously paired device

Bluetooth Connects but No Sound

Check:

• Left/right output wiring

• Audio ground

• Amplifier input

• Amplifier power

• Amplifier volume

• Smartphone volume

Only One Channel Works

Check:

• Left output connection

• Right output connection

• Solder joints

• Amplifier channel

• Audio wiring

High-Pitched Whine

Possible causes include:

• Shared noisy power supply

• Grounding arrangement

• Long audio wiring

• Insufficient local filtering

Improve supply filtering and wiring layout.

Hum or Buzz

Try:

• Shorter signal wires

• Shielded audio cable

• Improved grounding

• Separating signal and high-current wiring

Bluetooth Range Is Short

Check for:

• Metal enclosure

• RF obstruction

• Antenna area blocked by wiring

• Wireless interference

• Excessive distance

Engineering Principle

A clean DIY Bluetooth audio system depends on:

Clean Power + Bluetooth Receiver + Good Signal Wiring + Audio Amplifier + Correct Speakers + Proper Grounding

Good power and grounding design can make as much difference to the final sound as the Bluetooth module itself.

FAQ

1. What is this module?

It is a compact Bluetooth stereo audio receiver module designed to add wireless audio reception to DIY amplifier and speaker projects.

2. Is this an amplifier?

No.

It provides line-level stereo audio and requires an external audio amplifier for normal passive speakers.

3. What is the operating voltage?

3.7V–5V DC

4. Can I power it with 5V?

Yes.

A clean regulated 5V supply is suitable.

5. Can I power it from a 3.7V lithium-ion battery?

The current RoboGears specification supports operation from approximately 3.7V DC, so a compatible single-cell lithium-based power system can be used when correctly designed.

6. Can I power it with 12V?

No.

12V exceeds the specified operating range.

Use a suitable regulator to reduce the voltage to within 3.7V–5V.

7. Can I power it with 24V?

No.

Use an appropriate regulated step-down supply.

8. Which Bluetooth version does it use?

The supplied chipset may provide:

Bluetooth 4.1 or Bluetooth 5.0

depending on manufacturing batch.

9. Why can't RoboGears guarantee Bluetooth 5.0?

Because the exact chipset can vary between supplied manufacturing batches.

10. Is the output stereo?

Yes.

The module provides left and right audio channels.

11. Can I connect speakers directly?

No.

The module provides line-level audio rather than high-power speaker output.

12. What do I need between this module and passive speakers?

An:

Audio Power Amplifier

is required.

13. Can I use it with PAM8403?

Yes.

A PAM8403 is a practical choice for compact 5V stereo Bluetooth speaker projects.

14. Can I use it with TPA3116D2?

Yes.

Connect the Bluetooth receiver's line-level stereo output to the amplifier's analogue input.

The Bluetooth receiver still requires its own suitable 3.7V–5V supply.

15. Can I use it with a TPA3255 amplifier?

Yes, as an analogue Bluetooth audio source.

Use an appropriate low-voltage regulated supply for the Bluetooth receiver.

16. Can I use it for a DIY Bluetooth speaker?

Yes.

This is one of its primary applications.

17. What is the wireless range?

Published range:

Approximately 10–15 metres line of sight

Actual range depends on environmental conditions.

18. Does it reconnect automatically?

The current RoboGears listing specifies automatic reconnection to the previously paired device after power-up.

19. Does it have an LED?

Yes.

An onboard status LED is specified.

20. What is the approximate module size?

Approximately:

30 × 20mm

according to the current listing.

21. Does it have left and right output?

Yes.

It provides stereo line-level audio.

22. Does it have Bluetooth calling support?

The current product specification lists Bluetooth profiles including:

HFP and HSP

However, exact hands-free functionality may vary with chipset revision and the final system design.

23. Does it support A2DP?

Yes.

A2DP is listed for stereo Bluetooth audio reception.

24. Can I connect headphones directly?

The current listing describes the module as line-level and mentions headphone-amplifier applications.

For predictable headphone performance, using a suitable headphone-amplifier stage is recommended rather than assuming direct drive capability for every headphone impedance.

25. Why do I hear a high-pitched noise?

This can occur when the Bluetooth receiver shares a noisy power supply or ground arrangement with an amplifier.

Improve:

• Power filtering

• Grounding

• Signal wiring

• Supply regulation

26. Can I add a capacitor to reduce noise?

The current RoboGears listing suggests approximately:

100µF across VCC and GND

as one possible power-filtering measure.

Observe capacitor polarity and voltage rating.

27. Can I install it directly onto another PCB?

Its compact SMD-style pad arrangement is intended to make integration into custom electronics projects easier.

Verify the actual module pad layout before designing a production PCB around it.

28. Does it have an onboard amplifier?

No.

An external amplifier is required for passive speakers.

29. What is included?

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

30. Are speakers included?

No.

31. Is an amplifier included?

No.

32. Is a battery included?

No.

33. Is a 5V adapter included?

No.

34. Is this a Bluetooth transmitter?

No.

It is intended primarily as a Bluetooth audio receiver.

35. What is the simplest complete setup?

A compact system can use:

Phone → Bluetooth Receiver → PAM8403 → Left + Right Speakers

with an appropriately designed 5V power arrangement.

Important Note

This module is a Bluetooth audio receiver, not an audio power amplifier.

Do not connect passive speakers directly to its line-level output.

Disclaimer

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

The operating voltage, stereo receiver function and other product characteristics should always be verified against the actual module supplied when a project depends on a specific chipset revision.