Universal Bluetooth FM MP3 Player Decoder Module with Big IC – USB/TF/AUX Audio Panel with IR Remote for DIY Speakers and Car Stereo Upgrades

Key Features

• Multi-function audio decoder/player module

• Big IC version

• Bluetooth wireless audio reception

• USB flash-drive playback

• TF / SD card playback

• FM radio

• 3.5mm AUX input

• Large high-visibility digital LED display

• MP3 file support

• WMA file support

• WAV file support

• FLAC file support

• APE file support

• IR wireless remote control

• ≥8m published IR remote range

• Resume playback functionality

• 5V DC operation

• 5V / 1A recommended supply

• JST wiring interface

• Suitable for external power amplifiers

Technical Specifications

Supported Audio Sources

Supported Audio File Formats

Large Digital Display

The module features a large LED display designed to show relevant operating information such as:

• Selected mode

• Track information

• FM frequency

The larger display makes it suitable for front-panel installation in custom speaker and amplifier enclosures.

FM Radio

Published FM tuning range:

87.5MHz–108MHz

For reliable reception, use the module's designated FM antenna connection and keep the antenna away from electrically noisy components.

Resume Playback Function

The module includes a playback resume function designed to remember the previous playback state after power interruption.

Exact resume behaviour can depend on the selected source and module operation.

Audio Output

This module provides an audio signal intended for connection to an external amplifier.

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

For passive speakers:

Decoder → Power Amplifier → Speakers

Compatibility

This module is designed to act as the audio-source and decoding stage of a compatible amplifier or powered audio system.

Compatible Audio Sources

The module supports:

• Bluetooth smartphones

• Bluetooth tablets

• Compatible Bluetooth computers

• USB flash drives

• TF / SD memory cards

• FM radio

• Compatible AUX audio sources

Compatible Power Amplifiers

Its audio output can be connected to compatible analogue-input amplifier boards such as:

• PAM8403

• TPA3110

• TPA3116D2

• TPA3118

• TPA3255

• Other compatible audio power amplifiers

Always verify the input and grounding requirements of the selected amplifier.

Example — DIY Bluetooth Speaker

Smartphone

↓

Bluetooth

↓

Decoder Module

↓

Stereo Power Amplifier

↓

Speakers

Example — USB / TF Music System

USB Flash Drive / TF Card

↓

Decoder Module

↓

Power Amplifier

↓

Speakers

Example — Home Amplifier Upgrade

An older amplifier with a compatible line-level input can be upgraded:

Bluetooth / USB / TF / FM

↓

Decoder Module

↓

Existing Amplifier

↓

Speakers

Example — Complete System With Tone Control

For a more advanced DIY audio system:

Bluetooth / USB / TF / FM / AUX

↓

Decoder Module

↓

Bass / Treble Preamplifier

↓

Power Amplifier

↓

Speakers

This arrangement can provide multimedia playback plus separate tone control and speaker amplification.

Power Compatibility

The decoder requires:

5V DC

Recommended supply:

5V / 1A

If the main power amplifier operates at:

• 12V

• 24V

• 36V

• 48V

do not connect that voltage directly to this decoder.

Use a suitable regulated 5V supply for the decoder module.

Important — External Amplifier Required

The module is an:

Audio Decoder / Media Player

It is not a high-power speaker amplifier.

For normal passive speakers:

Decoder → Power Amplifier → Speakers

Before Purchase

Supply: 5V DC

Recommended Supply: 5V / 1A

Bluetooth: Yes

USB: Yes

TF / SD: Yes

FM: Yes

AUX: Yes

Display: Large LED

Remote: Included

MP3: Yes

WMA: Yes

WAV: Yes

FLAC: Yes

APE: Yes

Direct Passive Speaker Drive: No

Applications

• DIY Bluetooth speakers

• Home audio systems

• Multimedia speaker systems

• Old amplifier upgrades

• Car stereo projects

• Custom speaker cabinets

• Portable boombox projects

• Workshop audio systems

• DIY amplifier systems

• Electronics projects

• Student audio projects

Who Is It For?

• DIY audio builders

• Electronics hobbyists

• Speaker builders

• Audio repair technicians

• Engineering students

• Makers

• Custom amplifier builders

📦 What's Included

❌ What's Not Included

The standard package does not specify the following as included:

• Audio Power Amplifier

• Speakers

• 5V Power Adapter

• USB Flash Drive

• TF / SD Memory Card

• AUX Cable

• Speaker Wiring

• Amplifier Enclosure

Important Purchase Note

This product is an:

Audio Decoder / Multimedia Player Module

It is not a complete speaker amplifier.

A typical DIY audio system requires:

Decoder Module

Audio Power Amplifier

Speakers

5V Decoder Power Supply

Included Remote Control

A large IR wireless remote control is included for convenient operation.

Published remote-control distance:

≥8 metres

Actual range depends on:

• Line of sight

• Remote battery condition

• Installation

• Obstructions

• Ambient infrared interference

Included JST Connections

The package includes a set of power and signal JST connectors for easier integration with the decoder module.

📚 Resources

This type of multimedia decoder module is available in multiple hardware revisions.

For permanent installation, always follow:

• PCB labels

• Connector markings

• Power polarity

• Audio-output markings

• Antenna markings

on the actual supplied module.

Do not assume the connector pinout from another visually similar MP3 decoder board.

Getting Started

Step 1 — Inspect the Connections

Before applying power, identify the actual PCB connections for:

• 5V power

• Ground

• Audio output

• FM antenna

• AUX

• Other labelled interfaces

Follow the PCB markings.

Step 2 — Connect the Power Supply

Recommended supply:

5V DC / 1A

Use a stable regulated power supply.

Do not exceed the module's specified 5V input.

Step 3 — Connect the Audio Output

Connect the module's audio output to a compatible power-amplifier input.

Basic connection:

Decoder Audio Output → Amplifier Audio Input

Step 4 — Connect the Amplifier to Speakers

Connect the speakers to the output of the power amplifier.

Do not connect normal passive speakers directly to the decoder's low-level audio output.

Step 5 — Set Amplifier Volume Low

Before initial power-up, reduce the amplifier volume.

Step 6 — Apply Power

Apply regulated 5V DC power.

The LED display should illuminate.

Step 7 — Select the Required Mode

Use the panel controls or supplied IR remote to select:

• Bluetooth

• USB

• TF / SD

• FM

• AUX

Bluetooth Setup

1. Select Bluetooth mode.

2. Enable Bluetooth on the smartphone.

3. Search for nearby Bluetooth audio devices.

4. Select the decoder when it appears.

5. Complete pairing.

6. Start music playback.

The exact Bluetooth pairing name is not specified and may vary by module revision.

USB Playback

1. Load supported audio files onto a USB flash drive.

2. Insert the USB drive.

3. Select USB mode if necessary.

4. Start playback.

5. Use the panel controls or remote for navigation.

TF / SD Card Playback

1. Load supported audio files onto a compatible card.

2. Insert the card correctly.

3. Select the appropriate playback mode.

4. Control playback using the module or remote.

FM Radio

1. Select FM mode.

2. Connect or extend the appropriate FM antenna.

3. Run station scanning using the module's controls.

4. Select an available station.

Published FM range:

87.5MHz–108MHz

AUX Mode

Connect a compatible analogue audio source to the AUX input and select AUX mode.

Basic System

Bluetooth / USB / TF / FM / AUX

↓

Universal Decoder

↓

Power Amplifier

↓

Speakers

Important Power Note

If your amplifier uses a higher supply voltage, use an appropriate regulated 5V supply for the decoder.

Never feed the amplifier's higher voltage directly into the decoder module.

🔧 Prototyping and Engineering Tips from RoboGears

1. Treat This as a Decoder, Not a Power Amplifier

The module handles:

• Bluetooth audio

• USB playback

• TF / SD playback

• FM radio

• AUX

• Digital audio decoding

• User-interface functions

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

2. Use a Regulated 5V Supply

Recommended:

5V / 1A

A clean regulated supply can help reduce:

• Hum

• Buzz

• Digital noise

• Unstable operation

3. Do Not Feed 12V Directly

This specific module is listed for:

5V DC

Do not assume that it accepts 9V or 12V simply because some visually similar MP3 decoder panels do.

4. Don't Copy Specifications From Similar Panels

MP3 decoder panels can look nearly identical while having different:

• Supply voltages

• Chipsets

• Connector pinouts

• Bluetooth versions

• Amplifier functions

• Microphone functions

Always follow the specification of the exact RoboGears module.

5. FLAC Support Does Not Mean Lossless Bluetooth

The module is specified to decode FLAC and APE audio files.

That does not establish lossless Bluetooth transmission.

For accurate wording use:

Supports MP3, WMA, WAV, FLAC and APE File Playback

rather than:

Lossless Bluetooth Audio

6. Keep Audio Signal Wiring Short

Keep the decoder-to-amplifier audio wiring as short as practical.

Long signal wires can pick up:

• Hum

• Switching noise

• RF interference

7. Use Shielded Cable Where Necessary

For longer analogue audio connections, shielded signal cable may reduce unwanted noise.

8. Keep FM Antenna Away From Metal

For improved radio reception, position the FM antenna away from:

• Metal enclosure walls

• Large heat sinks

• Transformers

• High-current wiring

9. Keep FM Antenna Away From Switching Noise

SMPS converters, digital circuits and amplifier switching stages can introduce interference.

Physical separation between the antenna and noisy electronics can improve FM reception.

10. Test the Remote Before Final Assembly

Make sure the IR receiver remains visible from the front of the enclosure.

Infrared remote control generally requires a usable line of sight.

11. Check JST Pinout Before Connecting

Do not assume wire colour alone determines function.

Verify:

• VCC

• GND

• Left Audio

• Right Audio

• Signal Ground

using the actual PCB markings.

12. Test All Playback Sources

Before permanently installing the panel, test:

• Bluetooth

• USB

• TF / SD

• FM

• AUX

• Remote control

• Display

• Resume function

• Left/right audio

Common Mistakes / Troubleshooting

Module Does Not Power On

Check:

• 5V supply

• Polarity

• JST connection

• Wiring

• Power-supply capacity

Bluetooth Does Not Connect

Try:

• Selecting Bluetooth mode

• Restarting the module

• Restarting smartphone Bluetooth

• Moving the phone closer

• Disconnecting previously connected devices

Bluetooth Connects but No Sound

Check:

• Phone volume

• Decoder output wiring

• Amplifier input

• Amplifier power

• Amplifier volume

USB Does Not Play

Check:

• Supported audio format

• USB drive

• File integrity

• Selected playback mode

TF / SD Card Does Not Play

Check:

• Card insertion

• Audio files

• Card condition

• Playback mode

FM Reception Is Poor

Check:

• Antenna connection

• Antenna position

• Nearby metal

• Electrical interference

• Station availability

Remote Does Not Work

Check:

• Remote battery

• Line of sight

• Distance

• IR receiver obstruction

Hum or Buzz

Check:

• 5V power quality

• Grounding

• Audio wiring

• Cable routing

• Shared power arrangement

Engineering Principle

A complete multimedia speaker system follows:

Audio Sources → Decoder → Power Amplifier → Speakers

This module handles the:

Audio Source + Decoder + User Interface

stages.

FAQ

1. What is this module?

It is a multi-function Bluetooth/FM/USB/TF/AUX audio decoder and media-player module.

2. What voltage does it require?

5V DC

3. What power supply is recommended?

5V / 1A

4. Can I give it 12V directly?

No.

The current RoboGears specification lists this module for 5V DC operation.

5. Does it have Bluetooth?

Yes.

6. Which Bluetooth version does it use?

A specific Bluetooth version is not published on the current RoboGears page.

Therefore, Bluetooth 4.0, 5.0 or another particular version should not be guaranteed without verifying the actual chipset.

7. Does it support USB flash drives?

Yes.

8. Does it support TF / SD cards?

Yes.

9. Does it have FM radio?

Yes.

10. What is the FM frequency range?

Published range:

87.5MHz–108MHz

11. Does it have AUX input?

Yes.

12. Which audio file formats are supported?

The current specification lists:

• MP3

• WMA

• WAV

• FLAC

• APE

13. Does it support FLAC?

Yes, according to the current published specification.

14. Does FLAC support mean Bluetooth is lossless?

No.

FLAC file decoding and Bluetooth transmission are separate functions.

No verified lossless Bluetooth codec is specified.

15. Does it have a display?

Yes.

A large digital LED display is provided.

16. What can the display show?

The current listing describes display of information such as:

• Active mode

• Track information

• FM frequency

17. Is a remote included?

Yes.

A large IR wireless remote is included.

18. What is the remote-control range?

Published range:

≥8 metres

under suitable operating conditions.

19. Does it remember the previous playback state?

The current product specification lists an intelligent resume function.

Exact behaviour can depend on playback source and operating mode.

20. What is the published frequency response?

80Hz–15kHz

21. What is the published SNR?

≥70dB

22. Can I connect speakers directly?

No.

The module provides a low-level audio signal intended for an external power amplifier.

23. Can I use it with PAM8403?

Yes, provided the decoder and amplifier are correctly powered and connected.

24. Can I use it with TPA3116D2?

Yes.

Its audio output can feed a compatible TPA3116D2 amplifier.

25. Can I use it with TPA3255?

Yes, as an audio source/decoder.

The decoder still requires its own regulated 5V supply.

26. Can I use it with a bass/treble preamplifier?

Yes.

A typical arrangement is:

Decoder → Bass/Treble Preamplifier → Power Amplifier → Speakers

27. Can I upgrade an old amplifier with it?

Yes.

It can add Bluetooth, USB, TF/SD-card and FM playback to a compatible amplifier system.

28. Can I build a Bluetooth speaker with it?

Yes.

A typical system is:

Decoder → Audio Amplifier → Speakers

29. Does it have a microphone input?

The current RoboGears description mentions a MIC slot for voice input.

However, microphone electrical specifications and supported microphone type are not documented.

Therefore, do not guarantee karaoke, recording or microphone amplification performance without testing the actual module.

30. Does it record audio?

Recording functionality is not verified on the current RoboGears listing.

Do not advertise recording unless the actual module is tested and confirmed.

31. Does it have bass and treble controls?

Dedicated bass and treble adjustment is not specified for this product.

Use a separate tone-control preamplifier if required.

32. Does it contain a power amplifier?

No speaker power amplifier is specified.

Use an external amplifier for passive speakers.

33. What is included?

The current listing specifies:

• 1 × Universal Bluetooth FM MP3 Decoder Module

• 1 × Large IR Wireless Remote Control

• 1 × Set of Power and Signal JST Connectors

34. Is a 5V adapter included?

No 5V power adapter is specified as included.

35. Is a USB flash drive included?

No.

36. Is a TF / SD card included?

No.

37. Are speakers included?

No.

38. Is an amplifier included?

No.

39. Why is FM reception weak?

Possible causes include:

• Poor antenna placement

• Nearby metal

• Electrical interference

• Weak local station

• Incorrect antenna connection

40. Why do I hear hum or digital noise?

Possible causes include:

• Noisy 5V supply

• Grounding problems

• Long signal wires

• Shared supply noise

• Poor cable routing

Important Note

This module is a multimedia audio decoder/player, not a speaker power amplifier.

Use a compatible external power amplifier to drive passive speakers.

Disclaimer

Minor PCB, display or component details can vary between manufacturing batches.

When a project depends on a specific connector, Bluetooth version, microphone function or pinout, verify the actual supplied module before permanent installation.