1. Product Overview
The MakerHawk TPA3116D2 Bluetooth 5.0 Stereo Audio Amplifier Module (Model ZK-502H) is a high-performance Class D amplifier designed for HiFi stereo audio applications. It features multiple audio input methods and robust protection mechanisms, making it suitable for various DIY audio projects and home entertainment systems.
Key Features:
- High Performance: Utilizes the TPA3116D2 Class D amplifier IC, offering high power output with low distortion (<0.1%).
- HiFi Stereo: Dual-channel 100W (50W*2) output for clear and rich audio.
- Multiple Audio Inputs: Supports AUX (3.5mm), Bluetooth 5.0, USB flash drive, and PC sound card input.
- Versatile Outputs: Compatible with both active and passive speakers.
- Bluetooth 5.0: Ensures higher transmission efficiency, stability, and an extended wireless range of up to 15m (49 feet) in open spaces.
- Robust Protection: Includes short-circuit, thermal, overvoltage, undervoltage, and DC protection to prevent damage.
- User-Friendly: Features a potentiometer for volume adjustment with an integrated power switch.
Figure 1: Detailed view of the ZK-502H amplifier board, highlighting various inputs, outputs, and the TPA3116D2 chip with heatsink.
Figure 2: The assembled amplifier module, showing the volume knob and various input ports for AUX, Bluetooth, and USB.
2. Package Contents
Verify that all components are present in your package:
- TPA3116D2 Bluetooth 5.0 Stereo Audio Amplifier Module (ZK-502H)
- Acrylic protective casing components
- Mounting hardware (screws, standoffs)
- Volume knob
- Small screwdriver
- DC power adapter cable (optional, may vary)
Figure 3: Contents of the ZK-502H amplifier kit, including the main board, acrylic case parts, knob, and tools.
3. Setup Instructions
3.1 Assembly (Optional)
If your module came unassembled with an acrylic case, follow these steps:
- Carefully remove all protective films from the acrylic panels.
- Attach the standoffs to the main amplifier board using the provided screws.
- Secure the bottom acrylic panel to the standoffs.
- Mount the top acrylic panel, ensuring all cutouts align with the board's components (e.g., volume knob, ports).
- Attach the volume knob to the potentiometer shaft.
3.2 Power Connection
The module requires a DC power supply between 9V and 24V. Connect the power supply to the DC input port on the board. Ensure correct polarity.
3.3 Speaker Connection
Connect your speakers to the speaker output terminals. The module supports both active and passive speakers. For passive speakers, ensure they are rated appropriately for the amplifier's output (50W per channel). Observe correct polarity for optimal sound quality.
Figure 4: Connection diagram showing how to connect audio sources (PC, USB, AUX) and speakers to the amplifier module.
4. Operating Instructions
4.1 Power On/Off and Volume Control
The volume potentiometer also functions as the power switch. Rotate the knob clockwise to turn on the module and increase volume. Rotate counter-clockwise to decrease volume and turn off the module.
4.2 Audio Input Selection
The module automatically detects and switches between input sources. Prioritize the desired input by connecting it first or disconnecting other sources.
- Bluetooth Input: Once powered on, the module will enter Bluetooth pairing mode. Search for "ZK-502H" on your device (smartphone, tablet, laptop) and pair. A confirmation sound will indicate successful pairing.
- AUX Input: Connect an audio source (e.g., MP3 player, CD player) to the 3.5mm AUX IN jack.
- USB Input: Insert a USB flash drive containing audio files into the USB port. The module will automatically play the audio.
- PC Sound Card Input: Connect the module to a PC via a USB cable. The PC should recognize it as an external sound card.
5. Maintenance
To ensure the longevity and optimal performance of your amplifier module, follow these maintenance guidelines:
- Cleaning: Use a soft, dry cloth to clean the module. Avoid using liquid cleaners or solvents.
- Environment: Operate and store the module in a dry, well-ventilated area, away from direct sunlight, high temperatures, and excessive humidity.
- Connections: Periodically check all connections (power, speakers, audio inputs) to ensure they are secure and free from corrosion.
- Avoid Overload: Do not exceed the recommended power supply voltage or speaker impedance to prevent damage to the amplifier.
6. Troubleshooting
If you encounter issues with your amplifier module, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound output |
|
|
| Bluetooth connection issues |
|
|
| Distorted sound |
|
|
| Module not powering on |
|
|
7. Specifications
| Specification | Value |
|---|---|
| Model Number | ZK-502H |
| Amplifier Chip | TPA3116D2 |
| Channels | 2.0 Stereo |
| Output Power | 2 x 50W (Max 100W total) |
| Supply Voltage Range | 9V - 24V DC |
| Bluetooth Version | 5.0 |
| Wireless Range | Up to 15m (49 feet) in open space |
| Audio Inputs | AUX (3.5mm), Bluetooth, USB Flash Drive, PC Sound Card |
| Protection Features | Short-circuit, Thermal, Overvoltage, Undervoltage, DC Protection |
| Dimensions (L x W x H) | 6cm x 6cm x 1.4cm (approx. 2.36 x 2.36 x 0.71 inches) |
| Item Weight | Approx. 2.4 ounces |
Figure 5: The assembled amplifier module with its approximate dimensions.
8. Warranty and Support
Specific warranty information and direct support contact details are not provided within this manual. Please refer to the product packaging or the retailer's website for warranty terms and customer support options.
