TG113 Bluetooth Speaker PCBA Module with FM Radio, USB TF Card, and AUX Input Wireless Audio Amplifier Board

Key Features

• TG113 portable speaker PCBA

• Bluetooth 5.0 published specification

• Stereo audio output

• Integrated low-power speaker amplifier

• FM radio

• USB flash-drive playback

• TF / MicroSD card playback

• 3.5mm AUX input

• 3.7V–5V DC operation

• Compatible with 1S 3.7V Li-ion battery systems

• Micro-USB 5V charging/power interface

• MP3 playback

• WAV playback

• WMA playback

• ≥85dB published SNR

• Onboard playback controls

• Mode-selection control

• Volume control through onboard buttons

• Suitable for direct connection to compatible low-power speakers

Technical Specifications

Playback Modes

Audio File Support

Published file compatibility includes:

• MP3

• WAV

• WMA

Integrated Amplifier

Unlike line-level decoder modules, the TG113 includes an onboard speaker-amplifier stage.

For compatible low-power speakers:

TG113 → Speakers

can be used directly.

A separate amplifier is therefore not mandatory for a basic portable speaker project.

Important Output-Power Note

TG113 PCBs are manufactured in multiple revisions.

Published output ratings across visually similar boards vary.

For this reason, do not guarantee a specific 5W+5W continuous output unless the amplifier IC and current RoboGears stock revision are physically verified.

A safer description is:

Integrated low-power stereo amplifier suitable for compatible portable-speaker drivers.

Compatibility

The TG113 is primarily designed for:

• Portable Bluetooth speakers

• TG113 speaker repairs

• DIY rechargeable speakers

• Compact multimedia speaker systems

Compatible Audio Sources

The module can receive audio through:

• Bluetooth smartphones

• Bluetooth tablets

• Compatible Bluetooth computers

• USB flash drives

• TF / MicroSD cards

• FM radio

• 3.5mm AUX sources

Speaker Compatibility

The module contains an integrated low-power stereo amplifier intended for small portable-speaker drivers.

Because TG113 hardware revisions vary, verify the actual speaker impedance and amplifier IC before designing a permanent custom system around a specific output rating.

For replacement applications, matching the original TG113 speaker drivers is preferable.

Battery Compatibility

The board is designed around a:

1S 3.7V Li-ion battery system

A compatible rechargeable Li-ion cell can therefore be used for portable operation.

Example — Rechargeable Bluetooth Speaker

3.7V Li-ion Battery

↓

TG113 PCBA

↓

Left + Right Speakers

Audio source:

Smartphone → Bluetooth → TG113

Example — USB Music Player

USB Flash Drive

↓

TG113

↓

Left + Right Speakers

Example — AUX Speaker

Phone / PC / Music Player

↓

3.5mm AUX

↓

TG113

↓

Speakers

Example — FM Speaker

FM Radio

↓

TG113

↓

Speakers

Before Purchase

Operating Voltage: 3.7V–5V DC

Battery Compatibility: 1S 3.7V Li-ion

Bluetooth: Bluetooth 5.0 Published

Stereo Output: Yes

Integrated Amplifier: Yes

USB: Yes

TF / MicroSD: Yes

FM: Yes

AUX: Yes

MP3: Yes

WAV: Yes

WMA: Yes

External Amplifier Required: Not for compatible low-power speakers

Applications

• TG113 Bluetooth speaker repair

• Portable Bluetooth speakers

• DIY rechargeable speakers

• Mini stereo speaker projects

• USB music players

• TF-card speakers

• FM radio speakers

• AUX speaker systems

• Electronics prototyping

• Student audio projects

• Custom portable audio systems

Who Is It For?

• Speaker repair technicians

• DIY audio builders

• Electronics hobbyists

• Engineering students

• Makers

• Portable speaker manufacturers

• Audio repair shops

📦 What's Included

❌ What's Not Included

Unless specifically shown or confirmed with the supplied batch, the standard package does not include:

• Li-ion Battery

• Speakers

• Speaker Enclosure

• Micro-USB Cable

• 5V USB Adapter

• AUX Cable

• USB Flash Drive

• TF / MicroSD Card

• External Antenna

• Additional Power Amplifier

Important Purchase Note

This is an:

All-in-One Bluetooth Speaker Controller + Low-Power Amplifier PCBA

For a basic rechargeable DIY speaker you will generally require:

TG113 PCBA

Compatible 3.7V Li-ion Battery

Compatible Left & Right Speakers

Speaker Enclosure

External Amplifier

For compatible low-power portable speakers, a separate amplifier is generally not required because the TG113 has an onboard amplifier stage.

For larger or higher-power speakers, use a properly designed external amplification system rather than assuming this small board can provide high-power output.

📚 Resources

TG113 speaker PCBs are available in multiple hardware revisions.

No exact chipset-level manufacturer datasheet has been verified for the current RoboGears batch.

Therefore:

• Follow the markings on the actual PCB.

• Verify speaker-output markings.

• Verify battery polarity.

• Verify the amplifier IC where exact output power is critical.

• Do not assume the pinout of another visually similar TG113 board.

Getting Started

Step 1 — Inspect the Board

Identify the actual connections and interfaces for:

• Battery

• Left Speaker

• Right Speaker

• USB

• TF / MicroSD

• AUX

• Micro-USB

• FM antenna pad if present

• Microphone if present

Follow the actual PCB markings.

Step 2 — Connect Compatible Speakers

Connect the speakers to the designated speaker-output connections.

Do not connect speakers to battery or signal connections.

Step 3 — Connect the Battery

Use a compatible:

1S 3.7V Li-ion battery

Verify:

Battery Positive + Battery Negative

before connection.

Reverse polarity can damage the board.

Step 4 — Initial Power-Up

After verifying all wiring, switch the module on using the appropriate onboard control.

Start at a moderate volume.

Step 5 — Bluetooth Pairing

1. Select Bluetooth mode.

2. Enable Bluetooth on your phone.

3. Search for nearby audio devices.

4. Select the TG113 speaker device.

5. Complete pairing.

6. Start music playback.

The exact Bluetooth pairing name can vary between board revisions.

Step 6 — USB Playback

Insert a USB flash drive containing supported audio files.

Use the onboard controls to navigate playback.

Step 7 — TF / MicroSD Playback

Insert a compatible TF / MicroSD card containing supported audio files.

Select the appropriate mode if the board does not switch automatically.

Step 8 — AUX Playback

Connect a compatible audio source through the 3.5mm AUX input.

Select AUX mode where necessary.

Step 9 — FM Radio

Select FM mode.

Run the board's station-search function using the onboard controls.

For improved reception, use the designated FM antenna connection where provided.

Step 10 — Charging

Connect a suitable:

5V Micro-USB power source

to the charging interface.

Do not connect a higher-voltage adapter to the Micro-USB input.

Basic Portable Speaker Architecture

3.7V Li-ion Battery

↓

TG113 Bluetooth/FM/USB/TF/AUX PCBA

↓

Left + Right Speakers

Important

Verify the actual PCB revision before permanent installation because TG113 boards can differ in component layout and speaker-output implementation.

🔧 Prototyping and Engineering Tips from RoboGears

1. This Is More Than a Bluetooth Decoder

The TG113 integrates several functions:

Bluetooth Receiver + Media Decoder + FM Radio + Battery Interface + Controls + Low-Power Stereo Amplifier

This makes it particularly useful for compact portable speakers.

2. Don't Guarantee 5W + 5W Yet

Different TG113 board revisions are advertised with different output ratings.

Until the amplifier IC on the current RoboGears stock is identified, describe it as:

Integrated Low-Power Stereo Speaker Amplifier

or:

Typically Around 3W + 3W, Depending on Board Revision

This is safer than guaranteeing 5W + 5W.

3. Use a 1S Li-ion Battery

The module is designed around approximately:

3.7V Li-ion operation

Do not connect:

• 2S Li-ion

• 7.4V

• 9V

• 12V

directly to the battery input.

4. Use 5V at the Micro-USB Input

Micro-USB charging/power input:

5V

Do not feed a higher voltage into this port.

5. Verify Battery Polarity

Always confirm:

BAT+

and:

BAT−

before connecting the cell.

Reverse polarity can damage the charging/power-management circuitry.

6. Use the Correct Speaker Load

Do not assume every small speaker is suitable.

The amplifier's intended speaker impedance should be confirmed from the actual PCB/amplifier IC where possible.

For a TG113 replacement, matching the original speaker specification is preferable.

7. Speaker Enclosure Matters

A small speaker tested in free air can sound weak even when the electronics are operating correctly.

Bass response depends heavily on:

• Speaker driver

• Enclosure volume

• Enclosure sealing

• Passive radiator / port design

8. FM Reception Can Be Improved

Where the PCB provides an ANT pad, a short wire antenna can improve FM reception.

Keep the antenna away from:

• Battery wiring

• Speaker output wiring

• Switching electronics

• Metal shielding

9. Test Charging Before Final Assembly

Before closing the enclosure, verify:

• Battery charging

• Charging indicator

• Battery operation

• USB playback

• Bluetooth

• TF playback

• FM

• AUX

• Both speaker channels

10. Keep Battery Wiring Short

Short, appropriately sized battery wiring reduces voltage drop.

This is particularly important during higher-volume playback.

11. Don't Use a Weak 5V Source

A weak USB source can cause:

• Distortion

• Restarting

• Unstable playback

• Charging problems

Use a stable 5V supply with sufficient current capacity.

12. Don't Assume Charging Means Full Battery Protection

An onboard charging circuit does not automatically prove that every battery-protection function is implemented.

For custom builds, a protected 1S Li-ion cell or appropriate battery-protection arrangement is preferable unless the board's protection circuitry has been verified.

13. Microphone Function May Be Revision Dependent

Some TG113 boards include an onboard microphone for Bluetooth calling.

Because PCB revisions vary, verify the actual current RoboGears module before advertising hands-free calling as a guaranteed feature.

14. Bluetooth Version Can Also Vary Across TG113 Revisions

The current RoboGears page publishes Bluetooth 5.0.

However, external TG113 boards are also documented as Bluetooth 4.2/5.0 depending on revision.

For the current listing, Bluetooth 5.0 can remain as the RoboGears published specification, but verify future batches if the chipset changes.

Common Mistakes / Troubleshooting

Board Does Not Power On

Check:

• Battery voltage

• Battery polarity

• Power switch/control

• Wiring

• Battery charge

Bluetooth Cannot Be Found

Try:

• Selecting Bluetooth mode

• Restarting the module

• Restarting phone Bluetooth

• Moving closer

• Disconnecting another paired phone

Bluetooth Connects but No Sound

Check:

• Phone volume

• TG113 volume

• Speaker wiring

• Speaker condition

• Playback mode

Only One Speaker Works

Check:

• Left/right speaker wiring

• Speaker itself

• PCB solder joints

• Output connections

Distortion at High Volume

Possible causes:

• Battery voltage drop

• Weak 5V source

• Incorrect speaker load

• Amplifier clipping

• Excessive volume

Board Restarts at High Volume

Check:

• Battery condition

• Battery current capability

• Wiring resistance

• Power-source capacity

FM Reception Is Poor

Check:

• Antenna

• Antenna location

• Electrical interference

• Local station strength

Battery Does Not Charge

Check:

• 5V USB supply

• Micro-USB connector

• Battery polarity

• Battery condition

• Charging circuit

Engineering Principle

A reliable portable Bluetooth speaker requires:

Correct Battery + Correct Speakers + Good Enclosure + Stable Power + Correct Wiring

The PCB is only one part of the final audio system.

FAQ

1. What is the TG113 module?

It is an all-in-one portable Bluetooth speaker controller and low-power stereo amplifier PCBA.

2. What functions does it support?

The current RoboGears specification includes:

• Bluetooth

• FM radio

• USB playback

• TF / MicroSD playback

• AUX input

• Stereo speaker output

• Li-ion battery operation

• Micro-USB charging/power input

3. What is the operating voltage?

3.7V–5V DC

4. Can I use a 3.7V Li-ion battery?

Yes.

The module is designed for compatible single-cell 3.7V Li-ion operation.

5. Can I use an 18650 battery?

A suitable single 3.7V Li-ion cell such as an appropriate 18650 can be used when correctly connected and electrically compatible.

6. Can I connect two 18650 cells in series?

No.

A 2S battery pack has a nominal voltage of approximately 7.4V and exceeds the board's specified operating range.

7. Can I connect two 18650 cells in parallel?

Parallel cells require proper matching, protection and battery-design practices.

For a simple project, a suitable single protected cell is easier and safer.

8. Can I power it with 5V?

Yes.

5V falls within the board's published operating range.

9. Can I give it 9V?

No.

10. Can I give it 12V?

No.

11. Does it have Bluetooth?

Yes.

12. Which Bluetooth version?

The current RoboGears product specification states:

Bluetooth 5.0

13. Do all TG113 boards use Bluetooth 5.0?

Not necessarily.

TG113 hardware revisions exist with different chipsets, so future batches should be verified.

14. Does it have FM radio?

Yes.

15. Does it support USB flash drives?

Yes.

16. Does it support TF / MicroSD cards?

Yes.

17. Does it have AUX input?

Yes.

18. Which audio formats are supported?

The current listing specifies:

• MP3

• WAV

• WMA

19. Does it have a built-in amplifier?

Yes.

It includes a low-power stereo speaker-amplifier stage.

20. Can speakers be connected directly?

Yes, compatible low-power speakers can be connected directly to the designated speaker outputs.

21. Do I need an external amplifier?

Not for a basic portable-speaker system using compatible low-power drivers.

A separate amplifier may be required for larger or higher-power speakers.

22. Is the output 5W + 5W?

Some TG113 revisions are advertised at 5W+5W, while others are commonly specified around 3W+3W.

Until the amplifier IC on the supplied board is confirmed, do not rely on 5W+5W as a guaranteed continuous rating.

23. Is it stereo?

The current RoboGears specification describes the board as supporting dual-speaker stereo output.

24. What speaker impedance should I use?

The exact amplifier IC/load specification should be verified from the current board revision.

For replacement use, match the original TG113 speaker drivers where possible.

25. Can I use 8Ω speakers?

Do not guarantee 8Ω compatibility without verifying the actual amplifier IC and board revision.

26. Does it charge the battery?

The board includes a Micro-USB charging/power interface intended for a compatible 3.7V Li-ion battery system.

27. What charging voltage should I use?

5V via Micro-USB

28. Can I use a phone charger?

A suitable regulated 5V USB supply can be used.

29. Does the board protect the battery?

Charging/power-management functionality is present, but the complete battery-protection feature set is not documented.

Use an appropriate protected battery/protection arrangement for custom projects unless the board circuitry has been verified.

30. Does it have control buttons?

Yes.

The board includes onboard controls for playback/mode/volume functions.

31. Does it have a microphone?

Some TG113 revisions include an onboard microphone.

Verify the actual supplied PCB before relying on microphone or hands-free-call functionality.

32. Can it answer Bluetooth phone calls?

Hands-free calling is documented on some TG113 versions, but this function should be verified on the current RoboGears batch before being guaranteed.

33. Can I make a rechargeable Bluetooth speaker with it?

Yes.

Typical architecture:

3.7V Li-ion Battery → TG113 → Left + Right Speakers

34. Can I repair an existing TG113 speaker with it?

Yes, this board is commonly used as a replacement controller for TG113-style portable Bluetooth speakers.

Compare the existing board's:

• Connector layout

• Speaker connections

• Battery connection

• Button arrangement

• Physical dimensions

before replacement.

35. Can I build a speaker from scratch?

Yes.

You will generally require:

• TG113 PCBA

• Compatible Li-ion battery

• Compatible speakers

• Enclosure

• Wiring

36. Why does it distort at high volume?

Possible causes include:

• Amplifier clipping

• Weak battery

• Voltage drop

• Incorrect speaker load

• Weak 5V supply

• Speaker limitation

37. Why does it restart when bass hits?

The battery or power source may be unable to maintain sufficient voltage under peak load.

38. Why is the bass weak?

Bass performance depends strongly on:

• Speaker size

• Speaker characteristics

• Enclosure volume

• Enclosure sealing

• Port/passive radiator design

39. What is included?

1 × TG113 Bluetooth Speaker PCBA Module

40. Is a battery included?

No battery is specified as included.

41. Are speakers included?

No.

42. Is a charging cable included?

No Micro-USB charging cable is specified as included.

Important Note

TG113 PCBs exist in multiple hardware revisions.

Bluetooth chipset, amplifier IC, microphone functionality, output power and component layout may vary.

Where a project depends on a specific feature, verify the actual supplied board before permanent installation.

Disclaimer

Always verify battery polarity and speaker connections before applying power.

Do not connect a 2S Li-ion pack, 9V battery or 12V supply directly to this 3.7V–5V module.