XH-A158 Bluetooth 5.0 Power Amplifier Board

XH-A158 Bluetooth 5.0 Power Amplifier Board is an ultra-compact, highly efficient dual-channel stereo audio solution perfectly optimized for DIY wireless speaker systems and portable electronics. This versatile module utilizes the high-efficiency PAM8403 Class D amplifier IC to deliver crisp, clear audio reproduction while drawing minimal power. Consequently, it extends battery life dramatically in portable configurations, eliminating the need for bulky, passive heat sinks. The integration of advanced Bluetooth 5.0 technology ensures a stable, long-range wireless audio connection with standard smartphones, tablets, and development boards. Furthermore, the layout combines simple power terminals and speaker outputs onto a single, space-saving PCB. Therefore, you can easily implement this board into custom enclosures, gaming arcades, or smart home audio nodes to achieve high-fidelity sound without circuit complexity.

Key Features:

• Advanced Bluetooth 5.0: Provides reliable wireless audio transmission over extended distances with lower latency and improved data throughput compared to legacy standards.
• High-Efficiency Class D: Employs a filterless Class D architecture that achieves over 90% efficiency, generating virtually no excess heat during high-volume playback.
• Dual-Channel Stereo: Delivers balanced left and right channel outputs to create a deep, immersive listening experience from digital audio streams.
• Onboard Volume & Navigation Control: Features integrated buttons or a dedicated adjustment knob for quick track skipping, volume tuning, and playback state modification.
• Ultra-Compact Footprint: The small, lightweight design fits comfortably inside micro-speaker cabinets, custom models, and handheld electronics.

Technical Specifications:

• Amplifier Chip Type: Diodes Inc. PAM8403 (Class D Stereo Audio)
• Bluetooth Version: 5.0 (Backward compatible with older Bluetooth versions)
• Operating Voltage Range: DC 5.0 V (Absolute maximum 5.5 V to prevent IC damage)
• Recommended Power Supply: 5 V DC, ≥ 2 A (Filtered low-ripple power source)
• Output Power: 5 W ± 5 W (Dual-channel stereo into 4 Ω loads)
• Signal-to-Noise Ratio (SNR): ≥ 90 dB
• Amplifier Voltage Magnification: 4 times

Mechanical Specifications:

• Board Material: High-grade FR4 Double-sided Glass Fiber PCB
• Mounting Holes: 4 corner holes for secure mechanical installation
• Installation Hole Distance: 38 mm x 35 mm
• Terminals: JST-style snap-in headers or solder pads for speaker and power lines

Dimensions:

• Total Length: ≈ 45 mm
• Total Width: ≈ 42 mm
• Total Height: ≈ 25 mm
• Product Weight: ≈ 22 g (Extremely lightweight for mobile builds)

Pinout and Wiring:

• Power Input (+5V / GND): Connect the center power terminal to a stable 5V DC source. However, take extreme care not to reverse the polarity, as reversing the positive and negative inputs will permanently burn the control circuitry.
• LOUT (+ / -): Connect the Left positive and negative output terminals directly to your left channel speaker.
• ROUT (+ / -): Connect the Right positive and negative output terminals directly to your right channel speaker.
• Wiring Note: Always keep the onboard serpentine Bluetooth antenna clear of metal enclosures, wires, or heavy battery packs to prevent severe signal attenuation or range reduction.

Datasheet Reference:

• Download PAM8403 Amplifier IC Datasheet

Commonly Used in:

• DIY Wireless Speakers: Serving as the main receiver and driver board in custom-built desktop or bookshelf Bluetooth speaker boxes.
• USB-Powered Audio Outlets: Integrating into computer monitor speakers or gaming soundbars powered entirely via standard 5V USB ports.
• Microcontroller Audio Projects: Partnering with development boards to output high-volume speech, sound effects, or synthesized audio streams wirelessly.

Applications:

• Portable Audio Players: Acting as the core module for battery-powered boomboxes that use lithium-ion cells combined with a 5V regulator.
• Arcade Machine Restoration: Replacing damaged, hot-running analog audio units inside vintage arcade cabinets with a compact, cool-running digital layout.
• Voice Communication Systems: Delivering distinct voice amplification in notification arrays, walkie-talkie modifications, and custom intercom networks.

Equivalent Models:

• XH-A156: A similar low-power stereo amplifier board, however, it features a different component layout and physical footprint.
• VHM-314: A standard Bluetooth audio decoder module that provides analog signals but lacks the built-in PAM8403 power amplifier stage.
• XY-P15W: An upgraded Bluetooth 5.0 Class D module that accepts a wider input voltage range for higher wattage output requirements.

Package Includes:

• 1 x XH-A158 Bluetooth 5.0 Power Amplifier Board