Gold-A543 120W Stereo Audio Amplifier Board with AUX

Key Features

• Gold-A543 high-power amplifier board

• Class-D digital amplification

• 2.0-channel stereo output

• Dual-channel architecture

• 120W maximum advertised output

• DC 12V–26V operating range

• 24V recommended for higher-output applications

• AUX analogue audio input

• Compatible with 4Ω–8Ω passive speakers

• TPA3116D2-type amplifier platform

• Aluminium heat sink

• Compact high-power PCB

• Suitable for DIY speaker projects

• Suitable for home audio

• Compatible with external Bluetooth receiver modules

Amplifier Specifications

Confirm the exact IC marking on current RoboGears stock before guaranteeing the semiconductor version.

Power Specifications

Speaker Specifications

Audio Input

Thermal Design

Understanding the Power Rating

There are conflicting published power specifications for generic Gold-A543 boards.

The product is commonly marketed using a 120W headline rating, while other Gold-A543 references specify approximately 50W per channel under practical operating conditions.

For this reason, RoboGears recommends treating:

120W as the maximum advertised product rating

rather than claiming 120W continuous RMS per channel.

Actual obtainable output depends on:

• Supply voltage

• Available supply current

• Speaker impedance

• Input signal level

• Cooling

• Wiring

• Amplifier-board revision

Supply Voltage and Output

Higher supply voltage generally allows greater available amplifier output within the permitted operating range.

A suitable:

24V regulated DC supply

is recommended for higher-output applications.

Lower supply voltages such as 12V will result in significantly lower maximum available speaker power.

Compatibility

The Gold-A543 is designed for a:

2.0-Channel Stereo Speaker System

consisting of:

• 1 × Left Passive Speaker

• 1 × Right Passive Speaker

Speaker Compatibility

Common Gold-A543 specifications indicate:

4Ω–8Ω passive speakers

For balanced stereo reproduction, use left and right speakers with matching:

• Impedance

• Power-handling capability

• Driver characteristics

Power Supply Compatibility

Operating range:

DC 12V–26V

For higher-output applications:

24V DC

is recommended.

The power supply must also provide adequate current for the required amplifier output.

Never exceed the board's maximum specified supply voltage.

AUX Audio Compatibility

The board provides an analogue AUX audio input and can therefore be used with compatible:

• Smartphones with analogue audio output/adaptor

• Computers

• Laptops

• TVs with analogue audio output

• MP3 players

• Audio decoder boards

• Bluetooth receiver modules

• Pre-amplifier boards

• Tone-control modules

Bluetooth Compatibility

Built-in Bluetooth is not confirmed for this exact RoboGears Gold-A543 listing.

For wireless audio, use:

Phone → Bluetooth Audio Receiver → Gold-A543 → Stereo Speakers

Tone Control Compatibility

An external stereo pre-amplifier or tone-control board can be connected before the Gold-A543 when adjustable:

• Volume

• Bass

• Treble

control is required.

Required for a Complete System

You will generally need:

• Suitable regulated DC power supply

• Left passive speaker

• Right passive speaker

• AUX audio source

• Speaker wiring

• Power wiring

Optional additions include:

• Bluetooth receiver

• Volume-control board

• Bass/treble pre-amplifier

• Power switch

• Enclosure

• Input connectors

Before Purchase

Channels: 2.0 Stereo

Operating Voltage: DC 12V–26V

Audio Input: AUX

Speaker Type: Passive

Speaker Impedance: 4Ω–8Ω

Bluetooth: Not confirmed as built in

USB Playback: Not confirmed

Dedicated Subwoofer Output: No dedicated subwoofer channel confirmed

Applications

• DIY stereo speaker systems

• Home audio amplifiers

• Desktop speakers

• Workshop speakers

• Custom amplifier builds

• Bookshelf speaker projects

• Multimedia audio systems

• External Bluetooth speaker projects

• Television audio projects

• Computer speaker systems

• Portable audio projects

• Educational audio electronics

• Audio prototyping

• Custom wooden speaker cabinets

Suitable For

• DIY audio builders

• Electronics hobbyists

• Engineering students

• Makers

• Speaker builders

• Audio technicians

• Electronics laboratories

📦 What's Included

❌ What's Not Included

Unless specifically supplied as part of another bundle, the standard amplifier-board package does not include:

• DC Power Supply / SMPS

• Left Speaker

• Right Speaker

• Subwoofer

• Bluetooth Receiver Module

• AUX Cable

• Speaker Wire

• Power Cable

• Pre-Amplifier

• Bass / Treble Control Board

• Complete Enclosure / Cabinet

• Power Switch

• Audio Source

Important Purchase Note

This product is an audio amplifier board, not a complete ready-to-use stereo system.

A basic setup requires:

DC Power Supply + Gold-A543 + Audio Source + Left Speaker + Right Speaker

For Bluetooth operation:

Bluetooth Receiver → Gold-A543 → Left + Right Speakers

Product Variation

Gold-A543 boards are produced in multiple manufacturing revisions.

PCB colour, IC markings, heat-sink design, capacitor brands, connectors and minor component placement may vary between batches.

RoboGears recommends checking the actual board markings whenever a project depends on a specific amplifier IC or PCB revision.

Getting Started

Step 1 — Identify the Connections

Before applying power, identify the markings on the actual PCB for:

• DC positive input

• DC negative / ground

• AUX audio input

• Left speaker output

• Right speaker output

Always follow the labels printed on the actual board.

Step 2 — Select the Power Supply

Supported operating range:

DC 12V–26V

For higher-output operation, a suitable:

24V regulated DC supply

is recommended.

The required current capacity depends on the intended speaker load and output level.

Step 3 — Select the Speakers

Use compatible passive stereo speakers.

Common Gold-A543 specifications indicate:

4Ω–8Ω

speaker compatibility.

Use matching left and right speakers wherever possible.

Step 4 — Connect the Speakers

Connect:

Left Speaker → Left Amplifier Output

Right Speaker → Right Amplifier Output

Follow the actual PCB terminal markings.

Step 5 — Connect the AUX Input

Connect a compatible stereo line-level audio source to the AUX input.

Suitable sources may include:

• Smartphone

• Computer

• MP3 player

• Bluetooth receiver

• Audio decoder module

Step 6 — Verify the Wiring

Before applying power, check:

• Correct supply voltage

• Correct DC polarity

• Speaker connections

• AUX connection

• No loose wire strands

• No short circuits

Step 7 — Start With Low Audio Level

Reduce the audio-source volume before powering the amplifier for the first time.

Step 8 — Apply Power

Switch on the DC power supply.

Check for:

• Abnormal heating

• Smoke

• Unusual smell

• Speaker noise

• Unstable operation

Step 9 — Test Both Stereo Channels

Play an audio source at low volume.

Confirm:

• Left-channel operation

• Right-channel operation

• Clean audio reproduction

Step 10 — Increase Volume Gradually

Increase the source level gradually while monitoring:

• Sound quality

• Speaker movement

• Heat-sink temperature

• Power-supply stability

Basic AUX Setup

Stereo Audio Source

↓

AUX Input

↓

Gold-A543 Stereo Amplifier

↓

Left Speaker + Right Speaker

Bluetooth Setup

Smartphone

↓

External Bluetooth Receiver

↓

AUX Input

↓

Gold-A543

↓

Left + Right Speakers

Recommended Higher-Power Setup

For higher-output applications:

24V Regulated DC Supply + Gold-A543 + Suitable 4Ω–8Ω Stereo Speakers

provides a practical starting configuration.

Actual output depends on the power supply, speaker load and exact board revision.

🔧 Prototyping and Engineering Tips from RoboGears

1. Treat 120W as an Advertised Maximum Rating

Do not advertise the Gold-A543 as:

120W + 120W RMS

unless your exact board has been independently tested under defined conditions.

Different Gold-A543 listings publish significantly different output ratings.

2. Use 24V for Higher Output

A 12V supply can operate the board, but maximum available speaker power will be considerably lower.

For higher-output applications, a suitable:

24V regulated supply

is preferable.

3. Select Adequate Supply Current

The power supply must provide enough current for:

• Both amplifier channels

• Speaker load

• Desired volume

• Dynamic audio peaks

An undersized supply can cause:

• Distortion

• Voltage drop

• Premature clipping

• Unstable operation

4. Use 4Ω–8Ω Speakers

Common Gold-A543 documentation specifies:

4Ω–8Ω

speaker compatibility.

Avoid connecting lower-impedance loads unless the exact board documentation explicitly supports them.

5. Use Matching Stereo Speakers

For balanced left/right reproduction, use speakers with matching:

• Impedance

• Power rating

• Driver type

• Enclosure characteristics

6. Keep AUX Wiring Short

Analogue audio input wiring can pick up electrical interference.

Keep AUX wiring:

• Short

• Away from speaker wiring

• Away from high-current DC wiring

Use shielded cable when appropriate.

7. Use a Clean Regulated Supply

Poor-quality power supplies can introduce:

• Hum

• Buzz

• Switching noise

• Distortion

A properly regulated supply is recommended for audio projects.

8. Maintain Heat-Sink Airflow

The aluminium heat sink must be able to dissipate heat.

Avoid enclosing the amplifier tightly without ventilation during sustained high-output operation.

9. Add Bluetooth Externally When Required

Built-in Bluetooth is not confirmed for the exact RoboGears Gold-A543.

A separate Bluetooth audio receiver provides a straightforward wireless upgrade.

10. Add Tone Control Externally

For adjustable bass and treble:

Audio Source → Tone-Control/Pre-Amplifier → Gold-A543 → Speakers

is a practical architecture.

11. Test Before Installing in a Cabinet

Before final assembly, verify:

• Left output

• Right output

• AUX input

• Supply voltage

• Audio quality

• Heat-sink temperature

12. Don't Select Speakers From Wattage Alone

Speaker suitability also depends on:

• Impedance

• Sensitivity

• Driver construction

• Enclosure

• Frequency response

A higher wattage number alone does not guarantee better sound.

Troubleshooting

No Sound

Check:

• DC supply

• Supply polarity

• AUX source

• AUX cable

• Speaker connections

• Source volume

Only One Channel Works

Check:

• Left/right speaker wiring

• AUX input

• Audio cable

• Speaker condition

Swap the left and right speakers to help identify whether the problem follows the speaker or amplifier channel.

Low Output

Check:

• Supply voltage

• Available supply current

• Source volume

• Speaker impedance

Distortion at High Volume

Possible causes include:

• Insufficient supply current

• Low supply voltage

• Amplifier clipping

• Excessive input level

• Speaker limitation

Hum or Buzz

Check:

• Power-supply quality

• AUX cable

• Audio grounding

• Wiring layout

Keep low-level signal wiring away from high-current power and speaker wiring.

Amplifier Gets Hot

Check:

• Speaker impedance

• Supply voltage

• Output level

• Heat-sink airflow

• Speaker wiring

Engineering Principle

A reliable stereo system requires correct matching of:

Audio Source + Power Supply + Amplifier + Speakers + Wiring + Enclosure + Cooling

The amplifier's headline wattage alone does not determine actual usable output or sound quality.

FAQ

1. What is the Gold-A543?

The Gold-A543 is a dual-channel Class-D stereo audio power amplifier board designed for DIY and custom audio systems.

2. Is it stereo?

Yes.

It provides separate left and right audio channels.

3. What is the operating voltage?

The current RoboGears listing specifies:

DC 12V–26V

4. What is the maximum advertised output?

The current RoboGears product page specifies:

120W maximum output

However, published Gold-A543 specifications vary considerably between manufacturers and sellers.

5. Is it 120W + 120W RMS?

RoboGears does not recommend claiming 120W + 120W continuous RMS without test data for the exact board.

The 120W figure should be treated as a maximum advertised product rating.

6. Which amplifier IC does it use?

Gold-A543 boards are commonly documented with the:

TPA3116D2

Class-D amplifier platform.

Because generic board revisions can vary, confirm the IC marking on the actual RoboGears stock before guaranteeing the exact semiconductor version.

7. What power supply should I use?

The board operates from:

12V–26V DC

For higher-output operation, approximately:

24V DC

is recommended.

The required current capacity depends on speaker load and desired output.

8. Can I use a 12V adapter?

Yes.

12V is within the published operating range, but maximum available output will be lower than with a suitable 24V supply.

9. Can I use a 24V SMPS?

Yes.

A properly regulated 24V DC SMPS with adequate current capacity is suitable for higher-output operation.

10. Can I use the RoboGears 36V 10A SMPS with this board?

No.

The Gold-A543 is specified for a maximum of approximately 26V DC.

A 36V supply exceeds that rating and could damage the amplifier.

11. Which speakers can I use?

Common Gold-A543 documentation specifies:

4Ω–8Ω passive speakers

12. Can I use 4Ω speakers?

Yes, based on commonly published Gold-A543 specifications.

13. Can I use 8Ω speakers?

Yes.

14. Does it have AUX input?

Yes.

AUX input is explicitly specified on the current RoboGears product page.

15. Does it have built-in Bluetooth?

Built-in Bluetooth is not confirmed for this exact RoboGears listing.

Use an external Bluetooth receiver if wireless audio is required.

16. Does it support USB playback?

USB playback is not confirmed for this product.

17. Does it support TF/microSD cards?

TF/microSD playback is not confirmed.

18. Does it have a dedicated subwoofer output?

No dedicated amplified subwoofer channel is confirmed.

This is a 2.0 stereo amplifier.

19. Can I connect a Bluetooth receiver?

Yes.

A compatible Bluetooth receiver can feed its analogue stereo output into the Gold-A543 AUX input.

20. Can I add bass and treble controls?

Yes.

A compatible stereo tone-control/pre-amplifier can be connected before the amplifier input.

21. Does it have a heat sink?

Matching Gold-A543 boards use an aluminium heat sink for thermal management.

22. Does it need ventilation?

Yes.

Provide airflow around the heat sink, particularly during sustained high-volume operation.

23. Can I use it for home speakers?

Yes.

It is suitable for compatible DIY home stereo speaker systems.

24. Can I use it for desktop speakers?

Yes, with an appropriate power supply and compatible passive speakers.

25. Can I use it for a Bluetooth speaker?

Yes.

Use:

Bluetooth Receiver → Gold-A543 → Left + Right Speakers

26. Is the power supply included?

No power supply is confirmed as included with the standard amplifier-board package.

27. Are speakers included?

No.

Speakers must be selected separately.

28. What is included?

The standard product is:

1 × Gold-A543 Stereo Audio Amplifier Board

29. Why do different sellers show different wattage figures?

Generic Gold-A543 boards are sold in multiple revisions and are advertised using different measurement conventions.

Output also changes with:

• Supply voltage

• Speaker impedance

• Available supply current

• Distortion limit

• Thermal conditions

For this reason, headline wattage numbers from different listings may not be directly comparable.

30. What is the safest specification to advertise?

For the current RoboGears listing:

Gold-A543 120W Maximum Advertised Stereo Amplifier Board, DC 12V–26V, AUX Input

is a conservative customer-facing description.

Important Safety Note

• Use DC power only.

• Observe correct polarity.

• Do not exceed 26V DC.

• Use compatible passive speakers.

• Prevent speaker-output short circuits.

• Disconnect power before changing wiring.

• Maintain airflow around the heat sink.

• Use a properly regulated power supply with adequate current capacity.

Disclaimer

The 120W specification represents the published maximum product rating and should not be interpreted as guaranteed continuous RMS output unless supported by test data for the exact board revision.

Actual output depends on supply voltage, available current, speaker impedance, input level, cooling and operating conditions.

Gold-A543 boards may be manufactured in different revisions. PCB layout, IC markings, heat-sink design, capacitors and other components may vary between batches.